Patent Publication Number: US-11376671-B1

Title: Method and apparatus for using a portable drill

Description:
TECHNICAL FIELD 
     The present disclosure generally relates to a multipurpose tool. More particularly, the present disclosure relates to a portable drill guide. Specifically, the present disclosure relates to a portable drill guide that is useable to enable a user to more accurately use a portable drill to drill a hole into a workpiece in a controlled straight line. 
     BACKGROUND 
     Hand drills, handheld drills, and portable power drills are versatile tools which are used in multiple projects for drilling holes into different types of workpiece, such as wood workpieces. Generally, portable power drills are used in woodworking projects for drilling and/or boring holes of different dimensions based on the selected drilling bit used with a selected portable power the drill. While a woodworker may use a portable power drill to drill various types of holes in workpieces, it is difficult and demanding to drill precise and accurate holes into a workpiece where the holes are substantially straight and orthogonal to the longitudinal axis of the workpiece. 
     To address these difficulties and problems, a woodworker may select a device or multiple devices to help stabilize and guide his or her portable power drill during a drilling operation. While such assisting devices are provided in the market, the woodworker may have to use a number of different devices to drill different precise holes into a workpiece. For example, the woodworker may have to use a first set of assisting devices with the portable power drill for drilling a first hole with a first set of dimensions and a second set of assisting devices with the portable power drill for drilling a second hole with a second set of dimensions. In another example, the woodworker may have to use a first set of assisting devices with the portable power drill for drilling a first hole that is located in a center of a workpiece and a second set of assisting devices with the portable power drill for drilling a second hole at a location away from the center of a workpiece. Such use of multiple assisting devices requires the woodworker to have access to these various assisting devices and requires the expenditure of more time and effort when the woodworker is drilling multiple holes into a workpiece. 
     SUMMARY 
     The presently disclosed drill guide provides a woodworker with a multifunctional tool which may be used for adjusting and aligning a portable drill in order to make a straight hole in a workpiece at a desired location and to a desired depth. The disclosed drill guide may reduce the overall number of portable drill assisting devices that a woodworker has to use to complete a project and may also the reduce the project&#39;s completion time since the need to switch between multiple devices is avoided. As such, the drill guide disclosed herein addresses some of the inadequacies of previously known drill assisting devices. 
     In one aspect, an exemplary embodiment of the present disclosure may provide drill guide. The drill guide may include a base plate. The drill guide may also include a first guide column and a second guide column provided on the base plate. The drill guide may also include a chuck carrier adapted to operatively receive a drill chuck of a portable drill. The chuck carrier is operably engaged with the first guide column and the second guide column where the chuck carrier is linearly moveable along the first guide column and the second guide column between a return position and a plunging position relative to the base plate. The drill guide may also include a tapered portion defined in the first guide column. The drill guide may also include a depth stopper operably engaged with the first guide column where the tapered portion enables self-tightening of the depth stopper about the first guide column. 
     This exemplary embodiment or another exemplary embodiment may further provide that the tapered portion further comprises a first diameter defined at a first end of the tapered portion; and a second diameter defined at a second end of the tapered portion that is greater than the first diameter, wherein the tapered portion is adapted to provide a self-tightening mechanism for the depth stopper about the first guide column when the chuck carrier moves towards the opening. This exemplary embodiment or another exemplary embodiment may further provide a biaser provided with the second guide column for returning the chuck carrier to the return position. This exemplary embodiment or another exemplary embodiment may further provide that at least one lock knob is operably engaged with one of the first guide column and the second guide column, and the at least one lock knob retains the chuck carrier on the one of the first guide column and the second guide column. This exemplary embodiment or another exemplary embodiment may further provide that the base plate further comprises a top surface and an opposed bottom surface which extend between a front end and an opposed rear end. This exemplary embodiment or another exemplary embodiment may further provide that an opening is defined in the base plate where the opening extends between the top surface and the bottom surface and wherein the opening is adapted to receive a drilling bit provided on the chuck carrier therethrough. This exemplary embodiment or another exemplary embodiment may further provide that the chuck carrier further comprises a chuck, and wherein the chuck is aligned with the opening of the base plate in a first position. This exemplary embodiment or another exemplary embodiment may further provide that the chuck carrier further comprises a chuck, wherein the chuck is located outwardly away from the base plate in a second position. This exemplary embodiment or another exemplary embodiment may further provide that the opening of the base plate is adapted to receive a drilling bit having a diameter of up to about one inch. This exemplary embodiment or another exemplary embodiment may further provide that the chuck of the chuck carrier is adapted to engage a drilling bit having a diameter of up to about two inches when the chuck is in the second position. This exemplary embodiment or another exemplary embodiment may further provide that the base plate further comprises a first side and an opposed second side, and wherein a groove is defined in the base plate disposed between the first side and the second side and extends from the top surface towards the bottom surface and the groove is adapted to receive a curvilinear workpiece therein. This exemplary embodiment or another exemplary embodiment may further provide that at least one centering pin is selectively operatively engageable with the base plate, where the at least one centering pin is movable between a first stored position on a top surface of the base plate and a first centering position on a bottom surface of the base plate. This exemplary embodiment or another exemplary embodiment may further provide that the at least one centering pin comprises a first centering pin and a second centering pin; the second centering pin is selectively operatively engageable with the base plate between a second stored position on the top surface of the base plate remote from the first centering pin and a second centering position on the bottom surface of the base plate remote from the first centering pin; wherein the first centering pin and second centering pin are adapted to align a workpiece with a chuck of the chuck carrier. This exemplary embodiment or another exemplary embodiment may further provide that a fence is adapted to abut an outermost edge of a workpiece and at least one guide rod, wherein the at least one guide rod operably engages the fence to the base plate. This exemplary embodiment or another exemplary embodiment may further provide that the chuck carrier is adapted to engage a drilling bit therein and the at least one guide rod maintains the fence a distance away from the drilling bit. This exemplary embodiment or another exemplary embodiment may further provide a fence; and at least one guide rod, wherein the at least one guide rod operably engages the fence to the base plate, and wherein a top surface of the fence is disposed adjacent to a bottom surface of the base plate. This exemplary embodiment or another exemplary embodiment may further provide a support rod operatively engaged with the base plate; a flip stop operatively engaged with the support rod, said flip stop having a stop arm; wherein the support rod maintains the flip stop a distance away from the drilling bit; wherein the at least one guide rod extends between a front end of the base plate and a rear end of the fence; and wherein the stop arm is orthogonal to the rear end of the fence. 
     In another aspect, an exemplary embodiment may provide a method of using a portable drill with a drill guide. The method comprising steps of operably engaging a drilling bit into a chuck of a chuck carrier of the drill guide; aligning a set of witness lines on a workpiece with guide markers provided on a base plate of the drill guide; setting a depth stopper to a desired height on a tapered portion of a first guide column of the drill guide; operably engaging a drill chuck of the portable drill with the chuck of the chuck carrier; collectively moving the portable drill and the chuck carrier along the first guide column towards an opening defined by the base plate; self-tightening the depth stopper about the first guide column as the chuck carrier moves towards the opening; and drilling a hole into the workpiece with the drilling bit. 
     This exemplary embodiment or another exemplary embodiment may further provide the step of collectively moving the portable drill and the chuck carrier away from the base plate via a biaser provided on a second guide column of the drill guide. This exemplary embodiment or another exemplary embodiment may further provide steps of rotating the chuck carrier from a first position where the drilling bit aligns with the opening in the base plate to a second position where the drilling bit is located outwardly away from the base plate; disengaging the drilling bit from the chuck carrier; and engaging another drilling bit of a greater diameter with the chuck carrier. This exemplary embodiment or another exemplary embodiment may further provide steps of removing a first lock knob from the first guide column of the drill base when the chuck carrier is in the first position; disengaging the chuck carrier from the first guide column; rotating the chuck carrier to the second position; reengaging the chuck carrier in the second position with the first guide column; and operably engaging the first lock knob with the first guide column to maintain the chuck carrier in the second position. This exemplary embodiment or another exemplary embodiment may further provide the steps of removing a first centering pin from a first stored position on a top surface of the base plate; removing a second centering pin from a second stored position on the top surface of the base plate; operably engaging the first centering pin at a bottom surface of the base plate in a first centering position; operably engaging the second centering pin at the bottom surface of the base plate in a second centering position; and locating the workpiece between the first centering pin and the second centering pin on the bottom surface of the base plate. This exemplary embodiment or another exemplary embodiment may further provide the step of positioning a workpiece into a groove defined by the base plate, wherein the workpiece defines a curvilinear shape. This exemplary embodiment or another exemplary embodiment may further provide steps of operably engaging at least one guide rod with a first end of the base plate; operably engaging a fence with the at least one guide rod; and positioning a top surface of the fence adjacent to a bottom surface of the base plate. This exemplary embodiment or another exemplary embodiment may further provide steps of operably engaging at least one guide rod with a first end of the base plate; operably engaging a fence with the at least one guide rod; positioning the fence a first distance away from the drilling bit; and abutting a rear end of the fence to a first outermost edge of the workpiece. This exemplary embodiment or another exemplary embodiment may further provide steps of operably engaging a support rod with a first side of the base plate; operably engaging a flip stop with the support rod; positioning the flip stop at a second distance away from the drilling fence; and abutting a stop arm of the flip stop to a second outermost edge of the workpiece, wherein the stop arm is orthogonal to the rear end of the fence. 
     In yet another aspect, an exemplary embodiment of the present disclosure may provide another drill guide. The drill guide may include a base plate. The drill guide may also include at least one guide column that is provided on the base plate. The drill guide may also include a chuck carrier that is operably engaged with the at least one guide column and being linearly moveable relative to the base plate, wherein the chuck carrier is adapted to engage a portable drill. The drill guide may also include a fence assembly that is operably engagable with the base plate The fence assembly is adapted to collectively maintain the base plate, the at least one guide column, the chuck carrier, and the portable drill at a predetermined location on a workpiece. 
     This exemplary embodiment or another exemplary embodiment may further provide that the base plate further comprises a front wall and an opposed rear wall, a first side wall, and an opposed second side wall; and wherein the fence assembly is selectively operatively engageable with the base plate at one of the front wall, the rear wall, the first side wall, and the second side wall. This exemplary embodiment or another exemplary embodiment may further provide that the fence assembly further comprises a fence and at least one guide rod which operably engages the fence to the base plate, and maintains the fence a distance away from the base plate. This exemplary embodiment or another exemplary embodiment may further provide that the fence is engaged with the at least one guide rod and is selectively movable between a first end of the at least one guide rod and a second end of the at least one guide rod. This exemplary embodiment or another exemplary embodiment may further provide that the fence comprises a plate and a step. The plate has a front end, an opposed rear end, a longitudinal axis that extends between the front end and the rear end, and the plate further has a top surface and an opposed bottom surface. The step extends outwardly from the top surface of the plate and includes an upper surface remote from the top surface of the plate. This exemplary embodiment or another exemplary embodiment may further provide that the rear end of the plate faces the base plate, and wherein the at least one guide rod extends between the rear end of the plate and the front end of the base plate. This exemplary embodiment or another exemplary embodiment may further provide that the upper surface of the plate and a top surface of the base plate both face in a same direction. This exemplary embodiment or another exemplary embodiment may further provide that the upper surface of the plate and a top surface of the base plate face in opposite directions. This exemplary embodiment or another exemplary embodiment may further provide that the top surface of the plate faces a bottom surface of the base plate. This exemplary embodiment or another exemplary embodiment may further provide that the bottom surface of the plate is orthogonal to a top surface of the base plate. This exemplary embodiment or another exemplary embodiment may further provide a first assembly that is operatively engaged with the base plate and is adapted to retain the base plate in a longitudinal position relative to a first edge of a workpiece; and a second assembly that is operatively engaged with the base plate and is adapted to retain the base plate in a transverse position relative to a second edge of the workpiece, wherein the first assembly and the second assembly are orthogonal to one another. 
     In another aspect, an exemplary embodiment may provide method of guiding a portable drill. The method comprising steps of operably engaging the portable drill to a drill guide; engaging at least one guide rod to a base plate of the drill guide; placing the base plate of the drill guide on a workpiece; engaging a fence of the drill guide with the at least one guide rod; positioning the fence against the workpiece; and maintaining a drilling bit on the drill guide at a predetermined location on the workpiece. 
     This exemplary embodiment or another exemplary embodiment may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a top surface of the workpiece; wherein the positioning of the fence against the workpiece includes placing a rear end of the fence on a side surface of the workpiece that is substantially perpendicular to the top surface of the workpiece; and positioning the fence at a distance away from the drilling bit via the at least one guide rod. This exemplary embodiment or another exemplary embodiment may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a top surface of the workpiece; wherein the positioning of the fence against the workpiece includes placing a front end of the fence on a side surface of the workpiece that is substantially perpendicular to the top surface of the workpiece; and positioning a portion of a top surface of the fence adjacent to a bottom surface of the base plate. This exemplary embodiment or another exemplary embodiment may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a top surface of the workpiece; placing an upper surface of the fence on the top surface of the workpiece; and positioning the fence a distance away from the drilling bit via the at least one guide rod. This exemplary embodiment or another exemplary embodiment may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a side surface of the workpiece; wherein the positioning of the fence against the workpiece includes placing a bottom surface of the fence on the top surface of the workpiece; and positioning the fence a distance away from the drilling bit via the at least one guide rod. 
     In another aspect, an exemplary embodiment may provide method of guiding a portable drill. The method comprising steps of engaging a first assembly with a base plate of a drill guide; placing the base plate on a surface of a workpiece; retaining the base plate in a longitudinal position relative to a first edge of the workpiece, wherein the first edge is orthogonal to the surface of the workpiece; orienting a second assembly orthogonally to the first assembly; engage the second assembly with the base plate of the drill guide; and retaining the base plate in a transverse position relative to a second edge of the workpiece, wherein the second edge is orthogonal to the first edge. 
     This exemplary embodiment or another exemplary embodiment may further provide locating a drilling bit of the drill guide at a predetermined location on the surface of the workpiece; rotating the drilling bit; and drilling a hole into the workpiece along a straight line. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       Sample embodiments of the present disclosure are set forth in the following description, are shown in the drawings and are particularly and distinctly pointed out and set forth in the appended claims. 
         FIG. 1  is a top, front, right side isometric perspective view of a drill guide in accordance with an aspect of the present disclosure, wherein the drill guide is illustrated operatively engaged with a fence assembly in accordance with a further aspect of the present disclosure. 
         FIG. 2  is a top, front, right side isometric perspective view of a drill guide in accordance with an aspect of the present disclosure, wherein a first centering pin and a second centering are provided in an isometric exploded view from the drill guide. The fence assembly is removed. 
         FIG. 2A  is an enlargement of the highlighted region in  FIG. 2 , wherein a first locking knob and a second locking knob are provided in an isolated exploded view from the drill guide. 
         FIG. 3  is a longitudinal cross-section of a chuck carrier of the drill guide taken in the direction of line  3 - 3  of  FIG. 2A . 
         FIG. 4  is a front elevation view of the drill guide of  FIG. 2 , wherein the chuck carrier is provided in a first position. 
         FIG. 5  is a rear elevation view of the drill guide of  FIG. 2 , wherein the chuck carrier is provided in the first position. 
         FIG. 6  is a right side elevation view of the drill guide of  FIG. 2 , wherein the chuck carrier is provided in the first position. 
         FIG. 7  is a left side elevation view of the drill guide of  FIG. 2 , wherein the chuck carrier is provided in the first position. 
         FIG. 8  is a transverse cross-section of first and second guide columns taken in the direction of line  8 - 8  of  FIG. 4 .  FIG. 8  is also a top plan view of a base plate and the first and second centering pin of the drill guide. 
         FIG. 9  is a bottom plan view of the drill guide, wherein the chuck carrier is provided in the first position. 
         FIG. 10  is a longitudinal cross-section of the drill guide taken in the direction of line  10 - 10  of  FIG. 2 . 
         FIG. 11  is a top, front, right isometric perspective view of a fence of the fence assembly, wherein a pair of thumb screws of the fence are provided in an isometric exploded view from the fence. 
         FIG. 12  is a longitudinal cross-section of the fence taken in the direction of line  12 - 12  of  FIG. 11 . 
         FIG. 13  is a top, front, right isometric perspective view of a guide rod of the fence assembly. 
         FIG. 14A  is a top, front, right isometric perspective view of the drill guide resting on a workpiece, wherein a drilling bit is operatively engaged with the drill guide, and wherein first and second guide rods of the fence assembly are operably engaged with the drill guide. 
         FIG. 14B  is a top, front, right isometric perspective view similar to  FIG. 14A  showing the drill guide resting on the workpiece, wherein guide markers of the drill guide are aligned with a set of witness lines scribed on the workpiece. 
         FIG. 14C  is a top, front, right isometric perspective view similar to  FIG. 14B  showing the drill guide resting on the workpiece, wherein the fence is operably engaged with the first and second guide rods and a rear end of the fence abuts an outermost end of the workpiece. 
         FIG. 14D  is a top, front, right isometric perspective view similar to  FIG. 14C  but only showing a portable power drill operatively engaged to a hex bit of the chuck carrier of the drill guide. 
         FIG. 14E  is a top, front, right isometric perspective view similar to  FIG. 14D  showing the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a hole. 
         FIG. 14F  is a top, front, right isometric perspective view similar to  FIG. 14E  showing a biaser of the drill guide in operation of moving the, drilling bit, the portable power drill, and the chuck carrier of the drill guide away from base plate after drilling a hole into the workpiece. 
         FIG. 15  is a right side elevation view showing the drill guide and the fence assembly with the workpiece, wherein the rear end of the fence abuts the outermost end of the workpiece as shown in  FIG. 14C . 
         FIG. 16  is a top, front, right isometric perspective view of the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a hole, wherein a top surface of the fence abuts a top surface of the workpiece. 
         FIG. 17  is a right side elevation view of drill guide and the fence assembly, wherein the top surface of the fence abuts the top surface of the workpiece as shown to  FIG. 16 . 
         FIG. 18  is a top, front, right isometric perspective view of the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a hole, wherein a front end of the fence abuts an outermost end of the workpiece and a portion of a top surface of the fence is beneath a bottom surface of the base plate of the drill guide. 
         FIG. 19  is a right side elevation view of drill guide and the fence assembly, wherein a front end of the fence abuts an outermost end of the workpiece and a portion of a top surface of the fence is beneath a bottom surface of the base plate of the drill guide as shown in  FIG. 18 . 
         FIG. 20  is a top, front, right isometric perspective view of the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a hole, wherein a bottom surface of the fence abuts an outermost end of the workpiece. 
         FIG. 21  is a right side elevation view of drill guide and the fence assembly, wherein the bottom surface of the fence abuts the outermost end of the workpiece as shown in  FIG. 20 . 
         FIG. 22  is a right side elevation view of the drill guide similar to  FIG. 6 , but the chuck carrier is provided in a second position. 
         FIG. 23  is a top, front, right isometric perspective view of the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a hole, wherein the workpiece is curvilinear-shaped and is maintained on the base plate of the drill guide. 
         FIG. 24A  is a top, front, right isometric perspective view of one of the centering pins in operation moving and disengaging from the top surface of the base plate of the drill guide via one of the locking knobs. 
         FIG. 24B  is a bottom, rear, left isometric perspective view of one of the centering pins in operation moving and engaging to the bottom surface of the base plate of the drill guide via one of the locking knobs. 
         FIG. 25A  is a transverse cross-section of first and second guide columns;  FIG. 25A  is also a top plan view of the drill guide resting on a workpiece, wherein the first and second centering pins are abutting first and second outermost sides of the workpiece at first locations. 
         FIG. 25B  is a transverse cross-section of first and second guide columns similar to  FIG. 25A ;  FIG. 25B  is also a top plan view similar to  FIG. 25A  showing the drill guide resting on a workpiece, wherein the drill guide is rotated about its vertical axis where the first and second centering pins are abutting first and second outermost sides of the workpiece at second, opposing locations. 
         FIG. 26  is a top, front, right isometric perspective view of a guide rod of a flip stop assembly. 
         FIG. 27  is a top, front, right, isometric perspective view of an extension rod of the flip stop assembly. 
         FIG. 28  is a top, front, right isometric perspective view of a flip stop of the flip stop assembly. 
         FIG. 29  is a top, rear, left isometric perspective view of the flip stop of the flip stop assembly in  FIG. 28 . 
         FIG. 30  is longitudinal cross-section of the flip stop taken in the direction of line  30 - 30  of  FIG. 28 . 
         FIG. 31A  is a partial exploded view of the flip stop assembly, wherein the fence assembly is operably engaged to the drill guide. 
         FIG. 31B  is a partial top, front, right isometric perspective view of the flip stop assembly and the fence assembly operably engaged to the drill guide. 
         FIG. 32A  is a top, front, right isometric perspective view of the flip stop assembly and the fence assembly operably engaged to the drill guide, wherein a first flip stop of the flip stop assembly and the fence of the fence assembly abut the workpiece, and wherein the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a first hole. 
         FIG. 32B  is a top, front, right isometric perspective view similar to  FIG. 32B  showing a biaser of the drill guide in operation of moving the portable power drill and the chuck carrier of the drill guide away from base plate after drilling the first hole into the workpiece, wherein a stop arm of the first flip stop is rotated away from the workpiece. 
         FIG. 32C  is a top, front, right isometric perspective view similar to  FIG. 32B  showing the flip stop assembly and the fence assembly operably engaged to the drill guide, wherein a second flip stop of the flip stop assembly and the fence of the fence assembly abut the workpiece, and wherein the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a second hole. 
         FIG. 32D  is a top, front, right isometric perspective view similar to  FIG. 32C  showing the flip stop assembly and the fence assembly operably engaged to the drill guide, wherein a third flip stop of the flip stop assembly and the fence of the fence assembly abut the workpiece, and wherein the portable power drill and the chuck carrier of the drill guide in operation moving and rotating the drilling bit into the workpiece for drilling a third hole. 
         FIG. 33  illustrates an exemplary method flow chart for using a portable power drill with a drill guide. 
         FIG. 34  illustrates an exemplary method flow chart for guiding a portable drill guide. 
         FIG. 35  illustrated another exemplary method flow char for guiding a portable drill guide. 
     
    
    
     Similar numbers refer to similar parts throughout the drawings. 
     DETAILED DESCRIPTION 
       FIG. 1  illustrates a drill guide, shown generally at  1 , for use with a hand drill or a portable drill, which is described in more detail below. Drill guide  1  generally includes a front end  1 A, a rear end  1 B that opposes the front end  1 A, and a longitudinal axis “X” that extends between the front end  1 A and the rear end  1 B. Drill guide  1  also generally includes a left side or first side  1 C, a right side or second side  1 D that opposes the left side  1 C, and a transverse axis “Y” that extends between the left side  1 C and the right side  1 D. Drill guide  1  generally includes a top end  1 E, a bottom end  1 F that opposes the top end  1 E, and a vertical axis “Z” that extends between the top end  1 E and the bottom end  1 F. It should be understood that the terms “front,” “rear,” “left,” “right,” “top,” and “bottom” are used to describe the orientation of drill guide  1  illustrated in the attached figures and should in no way be considered to limit the orientation in which drill guide  1  may be utilized during a drilling operation. 
     Referring now to  FIG. 1 , the drill guide  1  includes a base plate  10 , at least one guide column  12 , a chuck carrier  14 , a depth stopper  16 , a biaser  18 , at least one lock knob  20 , and a pair of centering pins  22 . Still referring to  FIG. 1 , a fence assembly or first assembly  200  may be operably engaged the drill guide  1  as desired by a woodworker when using the drill guide  1  during a drilling operation. Referring now to  FIG. 31B , a flip stop assembly or a second assembly  300  may also operably engage the drill guide  1  as desired by a woodworker when using the drill guide  1  during a drilling operation. Such use of the fence assembly  200  and the flip stop assembly  300  is described in more detail later herein. 
     The various components of drill guide  1  will now each be described in greater detail. Referring now to  FIGS. 1 and 2 , the base plate  10  includes a front end  30 A, a rear end  30 B that opposes the front end  30 A, and a longitudinal axis between the front end  30 A and the rear end  30 B. The longitudinal axis of base plate  10  is aligned with the longitudinal axis “X” of drill guide  1 . The base plate  10  also includes a left side or first side  30 C, a right side or second side  30 D that opposes the left side  30 C, and a transverse axis between the left side  30 C to the right side  30 D. The transverse axis of base plate  10  is aligned with the transverse axis “Y” of drill guide  1 . The base plate  10  also includes a top surface  30 E that faces the top end  1 E of the drill guide  1  and extends from the front end  30 A to the rear end  30 B of the base plate  10 . The base plate  10  also includes a bottom surface  30 F (seen in  FIG. 9 ) that faces the bottom end  1 F of the drill guide  1  and extends from the front end  30 A to the rear end  30 B of the base plate  10 . The vertical axis of base plate  10  extends between the top surface  30 E and bottom surface  30 F of the base plate  10  and is aligned with the vertical axis “Z” of drill guide  1 . 
     Still referring to  FIGS. 1 and 2 , the base plate  10  defines a central opening  32  that is disposed between the front end  30 A and the rear end  30 B of the base plate  10  and extends between top surface  30 E and bottom surface  30 F of base plate  10 . In the illustrated embodiment, the central opening  32  defined by the base plate  10  is curvilinear and/or round in shape. In one exemplary embodiment, a central opening defined by a base plate may be substantially elongated such that the central opening defined by the base plate is oblong-shaped. In another exemplary embodiment, a central opening defined by a base plate may be substantially elongated such that the central opening defined by the base plate is ovoidal. Furthermore, the central opening  32  may be any suitable shape that will enable different types of drilling bits of different diameters and lengths to be received therethrough, in particular drilling bits up to diameters of one inch. 
     Referring to  FIGS. 1 and 8 , the central openings  32  is also defined in a recess  33 . The recess  33  is bounded by a first circumferential wall  34  extending from the top surface  30 E to a flat intermediate wall  36  disposed between the top surface  30 E and the bottom surface  30 F. In addition, the recess  33  is also bounded by an angled bottom wall  38  that extends from the flat intermediate wall  36  to a second circumferential wall  40  that is disposed proximate to the bottom surface  30 F of the base plate  10 . 
     As clearly illustrated in  FIG. 8 , a set of guide markers  42  are provided on the angle bottom wall  30  in which first and second guide marker are aligned with one another parallel with the longitudinal axis of the base plate  10  and third and fourth guide marker are aligned with one another parallel with the transverse axis of the base plate  10 . The guide markers  42  on the base plate  10  allows a woodworker to align the guide markers  42  of the drill guide  1  with a set of witness lines provided on a workpiece for accurately positioning the drill guide  1  with a predetermined drilling location. Such use of guide markers  42  of the drill guide  1  during a drilling operation is provided in more detail below. 
     Referring now to  FIGS. 1, 2, and 8 , the base plate  10  defines a groove  44  that extends downwardly from the top surface  30 E and into the base plate  10  towards the bottom surface  30 F. The groove  44  is also disposed between the left end  30 C and the right end  30 D of the base plate  10  parallel with the transverse axis of the base plate  10 . In the illustrated embodiment, the groove  44  defined by the base plate  10  has a tapered-shape. In one exemplary embodiment, a groove defined by a base plate may be substantially triangular and/or V-shaped. In another exemplary embodiment, a groove defined by a base plate may be substantially trapezoidal. The groove  44  defined by the base plate  10  allows a woodworker to introduce a curvilinear and/or rounded workpiece (e.g., dowel rod, tapered rods, etc.) to the groove  44  such that the groove  44  of the base plate  10  prevents rotational movement of said curvilinear and/or rounded workpiece during a drilling process. Such use of the groove  44  defined by the base plate  10  during a drilling process is provided in more detail below. 
     Referring to  FIGS. 1, 2, and 5 , the base plate  10  also includes a first extension  46  and a second extension  48 . The first extension  46  is disposed proximate to the rear end  30 B and the right side  30 D of the base plate  10  and extends upwardly from the top surface  30 E parallel with the vertical axis “Z.” The second extension  48  is disposed proximate to the rear end  30 B and the left side  30 C of the base plate  10  and extends upwardly from upwardly from the top surface  30 E parallel with the vertical axis “Z.” In the illustrated embodiment, the first extension  46  and the second extension  48  oppose one another on the base plate  10  relative to the transverse axis of the base plate  10 . As illustrated in  FIG. 8 , the first extension  46  defines a passageway  47  that extends entirely through the base plate  10  and the first extension  46  relative to the vertical axis “Z”. Similarly, the second extension  48  defines a passageway  49  that extends entirely through the base plate  10  and the second extension  46  relative to the vertical axis “Z”. The uses of the first and second extensions  46 ,  48  are provided in more detail below. 
     Referring now to  FIGS. 2 and 4-7 , the base plate  10  defines a set of threaded openings  50  that extends laterally into the base plate  10  relative to the longitudinal axis or the transverse axis of the base plate  10 . Each threaded opening of the set of threaded openings  50  is substantially smaller than the central opening  32 . In the illustrated embodiment, each of the front end  30 A, rear end  30 B, left side  30 C, and right side  30 D defines at least one threaded opening  50 . In other words, the front end  30 A of base plate  10  defines at least one threaded opening  50 A from the set of threaded openings  50 , the rear end  30 B of base plate  10  defines at least one threaded opening  50 B from the set of threaded openings  50 , the left side  30 C of base plate  10  defines at least one threaded opening  50 C from the set of threaded openings  50 , and the right side  30 D of base plate  10  defines at least one threaded opening  50 D from the set of threaded openings  50 . In one exemplary embodiment, a front end, a rear end, a left side, and a right side of a base plate may define a pair of threaded openings in a set of threaded openings. In another exemplary embodiment, a front end, a rear end, a left side, and a right side of a base plate may define at least two threaded openings in a set of threaded openings. Such use of the set of threaded openings  50  is described in more detail below. 
     Referring now to  FIG. 2 , the base plate  10  defines a set of threaded passageways  52 . Each threaded passageway of the set of threaded passageways  52  is substantially smaller than the central opening  32 . Each threaded passageway of the threaded passageways  52  also extends entirely through the base plate  10  from the top surface  30 E to the bottom surface  30 F relative to the vertical axis “Z.” A first threaded passageway  52 A of the set of threaded passageways  52  is defined proximate to the left side  30 C and between the rear end  30 B and the groove  44 . A second threaded passageway  52 B of the set of threaded passageways  52  is defined proximate to the right side  30 D and between the front end  30 A and the groove. Such use of the set of threaded passageways  52  is described in more detail below. 
     Referring to  FIG. 1 , each guide column  12 A,  12 B of the pair of guide columns  12  operably engages with one of the first and second extensions  46 ,  48  of the base plate  10 . The guide columns  12 A,  12 B are substantially similar to one another and are engaged with the one of the first extension  46  and second extension  48  in the same orientation. Inasmuch as the guide columns  12  are substantially similar, the following description will relate to the first guide column  12 A. It should be understood, however, that the description of the first guide column  12 A applies substantially equal to the second guide column  12 B. 
     Referring to  FIG. 10 , the first guide column  12 A has a top end or first end  70 A, a bottom end or second end  70 B that opposes the top end  70 A, and a longitudinal axis that extends from the top end  70 A to the bottom end  70 B. The first guide column  12 A also has an outer surface  72  that is disposed circumferentially about the longitudinal axis of the first guide column  12 A between the top end  70 A and the bottom end  70 B. In the illustrated embodiment, the first guide column  12 A also defines a tapered portion  74  that laterally extends into the first guide column  12 A orthogonal to the longitudinal axis “X” of drill guide  1 . The tapered portion  74  is a flattened surface that extends along the first guide column  12 A orthogonal to the longitudinal axis “X” of drill guide  1 . The tapered portion  74  has a first end  74 A proximate to the top end  70 A of the first guide column  12 A, an opposed second end  74 B proximate to the bottom end  70 B of the first guide column  12 A, and a length “TS” that is measured from the first end  74 A to the second end  74 B. In addition, the tapered portion  74  defines a first diameter “T 1 ” at the first end  74 A of the tapered portion and a second diameter “T2” at the second end  74 B of the tapered portion  74 . The length “TS” of the tapered portion is less than the overall length of the first guide column  12 A measured from the top end  70 A of the first guide column  12 A to the bottom end  70 B of the first guide column  12 A. As illustrated in  FIGS. 4 and 10 , the tapered portion  74  tapers in diameter from the second end  74 B to the first end  74 A where the second diameter “T2” of the first guide column  12 A proximate to the second end  74 B of the tapered portion  74  is greater than the first diameter T 1 ” of the first guide column  12 A proximate to the first end  74 A of the tapered portion  74 . In the illustrated embodiment, the first guide column  12 A of the pair of guide columns is the only guide rod that has a tapered portion. In one exemplary embodiment, a first guide column and a second guide column may have a tapered portion. Such use of the tapered portion  74  of the first guide column  12 A is described in more detail below. 
     Still referring to  FIG. 10 , the first guide column  12 A has a first threaded passage  76 A and a second threaded passage  76 B. The first threaded passage  76 A extends downwardly from the top end  70 A of the first guide column  12 A towards the bottom end  70 B of the first guide column  12 A relative to the longitudinal axis of the first guide column  12 . As described later herein, the first threaded passage  76 A operably engages the first guide column  12 A to the chuck carrier  14 . The second threaded passage  76 B extends upwardly from the bottom end  70 B of the first guide column  12 A towards the top end  70 A of the first guide column  12 A relative to the longitudinal axis of the first guide column  12 . The first guide column  12 A also has a reduced portion  78  that extends from the bottom end  70 B towards the top end  70 A in which the reduced portion  78  has a smaller diameter than the rest of the first guide column  12 A. The reduced portion  78  is sized and configured to be received by the passageway  47  of the first extension  46  where the first guide column  12 A is operably engaged with the base plate  10 . In addition, a fastener  80  further operably engages the first guide column  12 A to the base plate  10  by operably fastening to the second threaded passage  76 B of the first guide column  12 A. Other suitable ways may be used to operably engage a first guide column to a base plate. Examples of operably engaging a first guide column to a base plate includes attaching, affixing, connecting, coupling, fastening, joining, linking, locking, mounting, press-fitting, securing, and other suitable ways of operably engaging a first guide column to a base plate. 
     Referring now to  FIGS. 1 and 2 , the chuck carrier  14  includes housing  90 . The housing  90  has a front end  90 A, a rear end  90 B that opposes the front end  90 A, and a longitudinal axis defined between the front end  90 A and the rear end  90 B. The housing  90  also includes a left side or first side  90 C, a right side or second side  90 D that opposes the left side  90 C, and a transverse axis that is defined between the left side  90 C and the right side  90 D. The housing  90  also includes a top surface  90 E, a bottom surface  90 F that opposes the top surface  90 E, and a vertical axis defined between the top surface  90 E and the bottom surface  90 F. As shown in  FIG. 3 , the housing  90  defines a front through-hole  92  that extends entirely through the housing  90  from the top surface  90 E to the bottom surface  90 F relative to the vertical axis of the housing  90 . 
     Still referring to  FIG. 3 , chuck carrier  14  includes at least one ball bearing  94 . In the illustrated embodiment, the chuck carrier  14  includes an upper ball bearing  94 A and a lower ball bearing  94 B. The upper ball bearing  94 A is disposed inside of the front through-hole  92  and operably engages with the housing  90  inside of said front through-hole  92 . In the illustrated embodiment, the upper ball bearing  94 A is press-fitted into the housing  90  via the front through-hole  92 . In other exemplary embodiments, any suitable engagement for maintaining an upper ball bearing inside of a housing may be used. The upper ball bearing  94 A is disposed proximate to the top surface  90 E of the housing  90  such that the upper ball bearing  94 A is even with the top surface  90 E of the housing  90  and fails to protrude outside of the front through-hole  92 . The lower ball bearing  94 B is also disposed inside of the front through-hole  92  and operably engages with the housing  90  inside of said first through-hole  92 . In the illustrated embodiment, the lower ball bearing  94 B is press-fitted into the housing  90  via the front through-hole  92 . In other exemplary embodiments, any suitable engagement for maintaining a lower ball bearing inside of a housing may be used. The lower ball bearing  94 B is disposed proximate to the bottom surface  90 F of the housing  90  such that the lower ball bearing  94 B is even with the bottom surface  90 F of the housing  90  and fails to protrude outside of the front through-hole  92 . In the illustrated embodiment, the upper ball bearing  94 A is disposed above the lower ball bearing  94 B relative to the vertical axis of the housing  90 . 
     Still referring to  FIG. 3 , the chuck carrier  14  also includes a hex bit  96  that has a top or first end  96 A and an opposed bottom or second end  96 B. A hex portion  98 A of the hex bit  96  defined from the first end  96 A to the top surface  90 E of the housing  90  is disposed exterior to the front through-hole  92 . As described in more detail herein, the hex portion  98 A allows a portable power drill to operably engage with the hex bit  96 . A blanked portion  98 B of the hex bit  96  defined between the top surface  90 E of the housing  90  to the bottom surface  90 F of the housing  90  operably engages with the upper ball bearing  94 A and the lower ball bearing  94 B inside of the front through-hole  92 . The mechanical engagement between the hex bit  96  and the upper ball bearing  94 A and lower ball bearing  94 B allows the upper ball bearing  94 A and lower ball bearing  94 B to support rotational movement of the hex bit  96  during a drilling operation. In other words, the upper ball bearing  94 A and lower ball bearing  94 B allows the hex bit  96  to freely rotate inside of the front through-hole  92  without any interruption caused by the housing  90 . A shoulder  98 C of the hex bit  96  is defined between the blanked portion  98 B and a threaded portion  98 D that prevents the hex bit  96  from backing out from the housing  90  once the hex bit  96  is assembled to the housing  90 . The hex bit  96  also has threaded portion  98 D that is defined between the shoulder  98 C and the second end  96 B of the hex bit  96 . The use of the threaded portion  98 D of the hex bit  96  is described in more detail below. The hex bit  96  also defines a threaded opening  99  that extends upwardly from the second end  96 B of the hex bit  96  towards the first end  96 A of hex bit  96  where the threaded opening  99  is defined inside of the threaded portion  98 D, the shoulder  98 C, and a portion of the blanked portion  98 B. 
     Still referring to  FIG. 3 , the hex bit  96  also defines an annular concave groove  98 E. The annular concave groove  98 E that extends between the hex portion  98 A and the blanked portion  98 B on the hex bit  96 . As described in more detail herein, the annular concave groove  98 E may allow a portable drill that includes a quick release to operably engage with the hex bit  96  during a drilling operation. Such types of portable drills are described in more detail below. 
     Still referring to  FIG. 3 , the chuck carrier  14  also includes a drill chuck  100 . The drill chuck  100  defines a threaded channel  101  that operably engages the hex bit  96  with the drill chuck  100 . In the illustrated embodiment, the threaded portion  98 D of the hex bit  96  operably fastens to the threaded channel  101  of the drill chuck  100 . In addition, a connector  102  passes through a non-threaded channel  103  defined by the drill chuck  100  and operably fastens the drill chuck  100  to the hex bit  96 . Upon assembly, the hex bit  96  and the drill chuck  100  may collectively rotate together during a drilling operation via a rotational force exerted by a portable power drill, which is described in more detail below. 
     In the illustrated embodiment, the drill chuck  100  is offset from the first and second columns  12 A,  12 B of the drill guide  1  in which the drill chuck  100  and the first and second columns  12 A,  12 B are positioned in different planes relative to the transverse axis “Y” of the drill guide  1 . As illustrated in  FIG. 9 , the first and second guide columns  12 A,  12 B are positioned in common plane where the first and second guide columns  12 A,  12 B are positioned in a first plane “P 1 ” that extends between the left and right sides  1 C,  1 D of the drill guide  1  parallel with the transverse axis “Y”. Still referring to  FIG. 9 , the drill chuck  100  is positioned in a second, different plane “P 2 ” that extends between the left and right sides  1 C,  1 D of the drill guide  1  parallel with the transverse axis “Y”. However, the second plane “P 2 ” is offset from the first plane “P 1 ” relative to the longitudinal axis “X” of the drill guide  1  at a distance “PD”. Such offset of the drill chuck  100  relative to the first and second guide columns  12 A,  12 B allows the woodworker to orient that drill chuck  100  and the chuck carrier  14  from a first orientation ( FIG. 1 ) to a second different orientation ( FIG. 22 ). Such first and second orientation for the drill chuck  100  and the chuck carrier  14  is described in more detail below. 
     The chuck carrier  14  may include any suitable drill chuck  100  in the drill guide  1 . In the illustrated embodiment, the chuck carrier  14  uses a keyless drill chuck for the drill chuck  100  on the drill guide  1 . In another exemplary embodiment, a chuck carrier may include a keyed drill chuck for a drill chuck on a drill guide. 
     Still referring to  FIG. 3 , a retaining ring  104  is operably engaged to the blanked portion  98 B of the hex bit  96 . The retaining ring  104  directly abuts the top surface  90 E of the housing  90  to provide a suitable support between the hex bit  96  and the housing  90  for holding and maintaining the position of the hex bit  96  inside of the housing  90 . In addition, a curved washer  106  is operably engaged to the hex bit  96  and the housing  90  in which the curved washer  106  is provided between the shoulder  98 C of the hex bit  96  and the bottom surface  90 F of the housing. In this illustrated embodiment, the curved washer  106  provides a spring-like profile and/or structural configuration to absorb light mechanical loads for keeping the hex bit  96  and associated parts operably engaged to the hex bit  96  in place during operation. 
     Referring now to  FIGS. 2A and 10 , the housing  90  has a first protrusion  108 A and a second protrusion  108 B. The first protrusion  108 A extends downwardly from the housing  90  away from the bottom surface  90 F relative to the vertical axis of the chuck carrier  14  and towards the base plate  10 . The first protrusion  108 A is positioned proximate to the rear end  90 B and the right side  90 D. The first protrusion  108 A defines a first rear through-hole  110 A that extends entirely through the chuck carrier  14  and the first protrusion  108 A from the top surface  90 E to the bottom surface  90 F relative to the vertical axis of the chuck carrier  14 . The second protrusion  108 B extends downwardly from the housing  90  away from the bottom surface  90 F relative to the vertical axis of the chuck carrier  14  and towards the base plate  10 . The second protrusion  108 B is positioned proximate to the rear end  90 B and the left side  90 C. The second protrusion  108 B defines a second rear through-hole  110 B that extends entirely through the chuck carrier  14  and the second protrusion  108 B from the top surface  90 E to the bottom surface  90 F relative to the vertical axis of the chuck carrier  14 . 
     Referring to  FIG. 10 , an upper bushing  112 A and a lower busing  112 B are provided inside each of the first rear through-hole  110 A and the second rear through-hole  110 B. Since both the upper bushing  112 A and the lower bushing  112 B are arranged identically in the first protrusion  108 A and the second protrusion  108 B, the structural arrangement of the upper bushing  112 A and the lower bushing  112 B inside of the first rear through-hole  110 A of the first protrusion  108 A will be described. It should be understood that while the structural arrangement of the upper bushing  112 A and the lower bushing  112 B inside of the first rear through-hole  110 A of the first protrusion  108 A is being described, such description is applied identically to the upper bushing  112 A and the lower bushing  112 B inside of the second rear through-hole  110 B of the second protrusion  108 B. 
     As shown in  FIG. 10 , the upper bushing  112 A is disposed inside of the first rear through-hole  110 A and operably engages the housing  90  inside of said first rear through-hole  110 A. In the illustrated embodiment, the upper bushing  112 A is press-fitted into the first protrusion  108 A of the housing  90  via the first rear through-hole  110 A. In other exemplary embodiments, any suitable engagement for maintaining an upper bushing inside of a first protrusion of a housing may be used. The upper bushing  112 A is disposed proximate to the top surface  90 E of the housing  90  such that the upper bushing  112 A is even with the top surface  90 E of the housing  90  and fails to protrude outside of the first rear through-hole  110 A. Still referring to  FIG. 10 , the lower bushing  112 B is disposed inside of the first rear through-hole  110 A and operably engages the housing  90  inside of said first rear through-hole  110 A. In the illustrated embodiment, the lower bushing  112 B is press-fitted into the first protrusion  108 A of the housing  90  via the first rear through-hole  110 A. In other exemplary embodiments, any suitable engagement for maintaining a lower bushing inside of a first protrusion of a housing may be used. The lower bushing  112 B is disposed proximate to the bottom surface  90 F of the housing  90  such that the lower bushing  112 B is even with the bottom surface  90 F of the housing  90  and fails to protrude outside of the first rear through-hole  110 A. In the illustrated embodiment, the upper ball bushing  112 A is disposed above the lower bushing  112 B relative to the vertical axis of the housing  90 . 
     Still referring to  FIG. 10 , the upper bushing  112 A and the lower bushing  112 B operably engage to the outer surface  72  of the first guide column  12 A inside of the first rear through-hole  110 A. Similarly, the upper bushing  112 A and the lower bushing  112 B operably engage to the outer surface  72  of the second guide column  12 B inside of the second rear through-hole  110 B. The use of the upper bushing  112 A and the lower bushing  112 B being positioned between each guide rod  12 A,  12 B and the chuck carrier  14  is considered advantageous at least because the upper bushing  112 A and the lower bushing  112 B allow the chuck carrier  14  to freely move along the outer surfaces  72  of the guide columns  12 A,  12 B for plunging a drilling bit into a workpiece, which is described in more detail below. In addition, the upper bushing  112 A and the lower bushing  112 B being positioned between each guide rod  12 A,  12 B and the chuck carrier  14  may be formed of any suitable material. In one exemplary embodiment, an upper bushing and a lower bushing positioned between guide rods and a chuck carrier may be formed of a polymer material. In another exemplary embodiment, an upper bushing and a lower bushing positioned between guide rods and a chuck carrier may be formed of Teflon™. 
     Referring now to  FIGS. 1, 2, and 10 , a depth stopper  16  is provided on the first guide column  12 A. The depth stopper  16  has a collar  120  that defines a top surface  120 A and an opposed bottom surface  120 B joined by a circumferential wall  121 . The collar  120  also defines a longitudinal axis between the top surface  120 A and the bottom surface  120 B. The depth stopper  16  also defines a central opening  122 A that extends entirely through the collar  120  from the top surface  120 A to the bottom surface  120 B relative to longitudinal axis of the collar  120 . The central opening  122 A is sized and configured to receive and house a portion of the first guide portion  12 A. As illustrated in  FIG. 10 , the depth stopper  16  also defines a threaded side opening  122 B disposed between the top surface  120 A and the bottom surface  120 B and extends entirely through circumferential wall  121 . In this illustrated embodiment, the threaded side opening  122 B is in fluid communication with the central opening  122 A. Such use of the threaded side opening  122 B is described in more detail below. 
     In addition, a depth stopper  16  includes a fastener  124 . The fastener  124  has a threaded shaft  124 A that is sized and configured to operably engage with the threaded side opening  122 B of the collar  120 . In other words, the threaded shaft  124 A operably threads to the threaded side opening  122 B of the collar  120 . The fastener  124  also includes an engaging end  124 B that operably engages with the tapered portion  74  of the first guide column  12 A. The fastener  124  also includes a knob  126  that is provided on the threaded shaft  124 A. The knob  126  allows a woodworker to tighten and/or loosen the fastener  124  for maintaining and/or moving the position of the collar  120  on the first guide column  12 A. When the fastener  124  is tightened to the first guide column  12 A, the threaded shaft  124 A extends through the threaded side opening  122 B and into the central opening  122 A to allow the engaging end  124 B of the fastener  124  to operably engage the tapered portion  74  of the first guide column  12 A (see  FIG. 10 ). The structural configuration between the fastener  124  of the depth stopper  16  and the tapered portion  74  of the first guide column  12 A is considered advantageous at least because the tapered portion  74  provides a self-tightening mechanism between the depth stopper  16  and the first guide rod  12 A. The self-tightening mechanism provided by the tapered portion  74  to the fastener  124  occurs because the tapered portion  74  keeps reducing as the tapered portion  74  progresses to the bottom end  70 B of the first guide column  12 A. In other words, the diameter of the tapered portion  74  proximate to the top end  70 A of the first guide column  12 A is less than the diameter proximate to the bottom end  70 B of the first guide column  12 A. When the fastener  124  is loosened from the first guide column  12 A, the threaded shaft  124 A backs into the threaded side opening  122 B and away from the central opening  122 A to allow the collar  120  to freely move along the tapered portion  74  and the outer surface  72  of the first guide column  12 A. 
     The depth stopper  16  is considered advantageous at least because the depth stopper  16  limits the downward travel of the chuck carrier  14  and all associated components on the chuck carrier  14  at a specific location of the tapered portion  74  on the first guide rod  12 A. With the inclusion of the tapered portion  74 , the depth stopper  16  remains at the desired location along the first guide column  12 A even when the chuck carrier  14  is exerted against the depth stopper  16  (via the woodworker) due to the self-tightening mechanism between the depth stopper  16  and the first guide column  12 A. In other words, the fastener  124  operably engaged with the collar  120  fails to move downwardly due to the tapered portion  74  preventing the fastener  124  from sliding and/or moving down the first guide column  12 A during one or more contacts with the chuck carrier  14  during a drilling operation. 
     Referring now to  FIGS. 1, 4, 5, and 7 , the biaser  18  has a top end or first end  130 A, an opposed bottom end or second end  130 B, and a longitudinal axis that extends between the top end  130 A to the bottom end  130 B. In the illustrated embodiment, the biaser  18  is circumferentially disposed about the second guide column  12 B. As illustrated in  FIG. 5 , the top end  130 A of the biaser  18  operably engages the lower surface of the second protrusion  108 B on the chuck carrier  14  in which the top end  130 A of the biaser  18  directly abuts the lower surface of the second protrusion  108 B on the chuck carrier  14 . As illustrated in  FIGS. 5 and 7 , the bottom end  130 B of the biaser  18  operably engages the second extension  48  of the base plate  10 . In other words, the bottom end  130 B of the biaser  18  directly abuts a top surface of the second extension  48  of the base plate  10 . In the illustrated embodiment, the biaser  18  is configured to bias the chuck carrier  14 , and associated components provided on the chuck carrier  14 , towards the top end  1 E of the drill guide  1  and away from the base plate  10  relative to the vertical axis “Z.” In the illustrated embodiment, the biaser  18  is a compression spring that is configured to oppose compression and return to its uncompressed length when the applied force is removed. In another exemplary embodiment, any suitable type of biaser may be used to bias a chuck carrier, and associated components provided on the chuck carrier, towards a top end of a drill guide and away from a base plate of the drill guide relative to a vertical axis of the drill guide. 
     The biaser  18  is considered advantageous at least because the biaser  18  assists a woodworker in moving the chuck carrier  14  and associated components provided on the chuck carrier  14  away from a workpiece after drilling a hole in said workpiece. In other words, the biaser  18  returns the chuck carrier  14  and associated components provided on the chuck carrier  14  to its original, pre-drilling position without the woodworker exerting a force on the drill guide  1  to move the chuck carrier  14 . 
     Referring to  FIGS. 1 and 2 , at least one locking knob  20  is provided in the drill guide  1 . In the illustrated embodiment, the drill guide  1  provides a first locking knob  20 A and a second locking knob  20 A that operably engage with one of the first guide column  12 A and the second guide column  12 B. The locking knobs  20 A,  20 B are substantially similar to one another and are engaged with one of the first guide column  12 A and the second guide column  12 B in the same orientation. Inasmuch as the locking knobs  20  are substantially similar, the following description will relate to the first locking knob  20 A. It should be understood, however, that the description of the first locking knob  20 A applies equally to the second locking knob  20 B. 
     Referring to  FIG. 2A , the first locking knob  20 A includes a shaft  140  that has a first end  140 A, an opposed second end  140 B, and a longitudinal axis defined between the first end  140 A and the second end  140 B. The shaft  140  has a threaded portion  142  that extends from the first end  140 A to a key portion  144  of the shaft  140 . As shown in  FIG. 10 , the threaded portion  142  is sized and configured to operably engage with the first threaded passage  76 A of the first guide column  12 A. In other words, the threaded portion  142  is sized and configured to operably thread with the first threaded passage  76 A of the first guide column  12 A. The key portion  144  of the shaft  140  extends from the threaded portion  142  to the second end  140 B of the shaft  140 . As shown in  FIG. 10 , the key portion  144  is sized and configured to be received by the first threaded passage  76 A such that the key portion  144  is housed inside of the first threaded passage  76 A of the first guide column  12 A. As described in more detail herein, the key portion  144  of the first locking knob  20  may operably engage with the centering pins  22 , the fence assembly  200 , and flip lock assembly  300 . Such engagement is described in more detail below. Referring to  FIG. 2A , a knob  146  is provided at the first end  140 A of the shaft  140  for allowing a woodworker to tighten and/or loosen the first locking knob  20 A from and/or to the first guide column  12 A and to manipulate the first locking knob  20 A when needed. As illustrated in  FIG. 10 , the engagement between the first locking knob  20 A and the first guide column  12 A limits the travel of the chuck carrier  14  when traveling away from the base plate  10  and towards the first end  70 A of the first guide column  12 A. The first locking knob  20 A limits the travel of the chuck carrier  14  by having a lower surface of the knob  146  (proximate to the first end  140 A of shaft  140 ) directly abutting the top surface  90 E of the housing  90  while the first locking knob  20 A is operably fastened to the first guide column  12 A. 
     In the illustrated embodiment, the key portion  144  of the locking knobs  20  is hexagonal-shaped (e.g. Allen wrench style key). While the key portion  144  of the locking knobs  20  is hexagonal-shaped, any suitable shape or configuration for a key portion on a locking knob may be used. Examples of suitable shapes or configuration for a key portion on a locking knob include flat style key, Philips style key, torx style key, square style key, star style key, and any other suitable shapes or configurations for a key portion on a locking knob for a particular embodiment. 
     Referring now to  FIGS. 1 and 2 , a pair of centering pins  22  is provided with the drill guide  1 . In the illustrated embodiment, the drill guide  1  provides a first centering pin  22 A and a second centering pin  22 A that operably engage with one of the threaded passageways  52  defined on the base plate  10 . The centering pins  22 A,  22 B are substantially similar to one another and are engaged with one of the threaded passageways  52  defined on the base plate  10  in the same orientation. Inasmuch as the centering pins  22  are substantially similar, the following description will relate to the second centering pin  22 B. It should be understood, however, that the description of the first centering pin  22 B applies equally to the first centering pin  22 A. 
     Referring now to  FIG. 2 , the centering pin  22  includes a top end or first end  150 A, an opposed bottom end or second end  150 B, and a longitudinal axis that extends between the top end  150 A to the bottom end  150 B. In the illustrated embodiment, the first centering pin  22 A includes a blanked portion  152  that extends from the top end  150 A to a threaded portion  156 . A passageway  154  is defined by the centering pin  22  inside of the blanked portion  152  and extends downwardly from the top end  150 A towards the bottom end  150 B relative to the longitudinal axis of the centering pin  22 . A plurality of facets  155  are also defined inside of the passageway  154  in a specific arrangement. In the illustrated embodiment, the plurality of facets  155  are arranged in a hexagonal arrangement. In other exemplary embodiment, a plurality of facets provided in a first centering pin may include a single recessed line arrangement, a recessed cross shape arrangement, a recessed star with rounded points arrangement, a recessed square arrangement, a recessed star arrangement, and any other suitable arrangements for a plurality of facets provided in a first centering pin for a particular embodiment. As described in more detail herein, the plurality of facets  155  of the centering pin  22  is complementary to the key portion  144  of the locking knobs  20 A,  20 B for allowing one of the first locking knob  20 A and the second locking knob  20 B to manipulate the centering pin  22 . Such manipulation by the locking knobs  20 A,  20 B to the centering pins  22 A,  22 B is described in more detail below. 
     Still referring to  FIG. 2 , the threaded portion  156  of the centering pin  22  extends from the blanked portion  152  to the bottom end  150 B of the centering pin  22 . The threaded portion  156  of the centering pin  22  may operably engage with one of the threaded passageways of the set of threaded passageways  52  defined on the base plate  10 . As illustrated in  FIGS. 1, 2, and 8 , the first centering pin  22 A operably engages with the first threaded passageway  52 A on the base plate  10  and the second centering pin  22 B operably engages with the second threaded passageway  52 B on the base plate  10 . As described in more detail herein, the first centering pin  22 A may operably engage with one of the threaded passageways of the set of threaded passageways  52  at the top surface  30 E of the base plate  10  (e.g., a stored position) and the bottom surface  30 F of the base plate  10  (e.g., a centering position). Such engagement between the centering pins  22  and the set of threaded passageways  52  on either the top surface  30 E of the base plate  10  or the bottom surface  30 F of the base plate  10  is described in more detail below. 
     As illustrated in  FIG. 1 , the fence assembly  200  includes a fence  202 , at least one thumb screw  204  operably engaged with the fence  202 , and at least one guide rod  206  operably engaged with both the fence  202  and the at least one thumb screw  204 . In the illustrated embodiment, the at least one guide rod  206  operably engages with base plate  10  of the drill guide  1  for operably engaging the fence  202  with the base plate  10  for a drilling operation. Such use of the fence assembly  200  with the drill guide  1  during a drilling operation is described in more detail below. 
     As illustrated in  FIGS. 1 and 11 , the fence  202  includes a plate  210 . The plate includes a front end  210 A, a rear end  210 B that opposes the front end  210 A, and a longitudinal axis that extends between the front end  210 A and the rear end  210 B. The fence  202  also includes a left side or first side  210 C, a right side or second side  210 D that opposes the left side  210 D, and a transverse axis that extends between the left side  210 C and the right side  210 D. The fence  202  also includes a first top surface  210 E, a bottom surface  210 F that opposes the first top surface  210 E, and vertical axis that extends between the first top surface  210 E and the bottom surface  210 F. 
     Still referring to  FIGS. 1 and 11 , the fence  202  includes a step  212 . In the illustrated embodiment, the fence  202  and the step  212  is a unibody component that is integrally extruded, molded, printed, or additively manufactured, removably machined, or formed as a unitary, monolithic member substantially fabricated from a rigid, manmade, material. In one example, metal or metal alloys, such as stainless steel or aluminum alloy, may form a substantial majority of the components or elements used to fabricate the fence and the various components integrally formed, molded, or extruded therewith. The rigid fence should withstand typical woodworking handling from an operator pressing the fence against a piece of wood without damaging the fence. While it is contemplated that the fence  202  and its additional components described herein are uniformly and integrally extruded, molded, or formed, it is entirely possible that the components of the fence be formed separately from alternative materials as one having routine skill in the art would understand. Furthermore, while the components of the fence are discussed below individually, it is to be clearly understood that the components and their corresponding reference elements of the fence are portions, regions, or surfaces of the body and all form a respective element or component of the unitary tool body. Thus, while the components may be discussed individually and identified relative to other elements or components of the fence, in this exemplary embodiment, there is a single fence having the below described portions, regions, or surfaces. 
     Still referring to  FIGS. 1 and 11 , the step  212  is positioned proximate to the rear end  210 B of the plate  210  and extends upwardly from the plate  210 . The step  212  includes a front end  212 A that is parallel with the front end  210 A of the plate  210 , a rear end  212 B that is parallel with rear end  210 B of the plate  210 , and a longitudinal axis that is parallel with the longitudinal axis of the plate  210 . The step  212  also includes a left side or first side  212 C that is parallel with the left side  210 C of plate  210 , a right side or second side  212 D that is parallel with the right side  210 D of the plate  210 , and a transverse axis that is parallel with the transverse axis of the plate  210 . The step  212  also includes a second upper surface  212 E that is parallel with the first top surface  210 E of the plate  210 . In the illustrated embodiment, each of the front surface  212 A, the rear surface  212 B, left side  212 C, right side  212 D, and second top surface  212  is disposed above the front surface  210 A, the rear surface  210 B, left side  210 C, right side  210 D, and first top surface  210 E relative to the vertical axis of the plate  210 . 
     Referring to  FIGS. 11 and 12 , the step  212  defines a first set of passageways  214 A that extends entirely through the step  212  from the front end  212 A to the rear end  212 B relative to the longitudinal axis of the step  212 . The step  212  also defines a second set of passageways  214 B that extends entirely through the step  212  and the plate  210  from the second upper surface  212 E of the step  212  to the bottom surface  210 F of the plate  210 . In the illustrated embodiment, the first set of passageways  214 A and the second set of passageways  214 B are defined orthogonally to one another and are in fluid communication with one another. In one example, a first passageway  214 A 1  of the first set of passageways  214 A is defined perpendicular to a first passageway  214 B 1  of the second set of passageways  214 B where the first passageways  214 A 1 ,  214 B 1  are in fluid communication with one another. As described in more detail herein, the at least one guide rod  206  may operably engage with fence  202  via one of the first set of passageways  214 A and the second set of passageways  214 B. Such engagement between the fence  202  and the at least one guide rod  206  is described in more detail below. 
     Still referring to  FIGS. 11 and 12 , the step  212  also defines a set of threaded passageways  216  that extends into the step  212 . As illustrated in  FIG. 12 , a first threaded passageway  216 A of the set of threaded passageways  216  extends from the right side  212 C of the step  212  and into the step  212  relative to the transverse axis of the step  212 . In the illustrated embodiment, the first threaded passageway  216 A is perpendicular to the first passageways  214 A 1 ,  214 B 1  and in fluid communication with said first passageways  214 A 1 ,  214 B 1 . The second threaded passageway (not illustrated) extends from the right side  212 C of the step  212  and into the step  212  relative to the transverse axis of the step  212 . The second threaded passageway is also perpendicular to second passageways  214 A 2 ,  214 B 2  of the first and second sets of passageways  214 A,  214 B and in fluid communication with said second passageways  214 A 2 ,  214 B 2 . 
     Referring now to  FIG. 11 , the at least one thumb screw  204  includes a first thumb screw  204 A and a second thumb screw  204 B that operably engage the one of the threaded passageways of the set of threaded passageways  216  of the fence  202 . The thumb screws  204 A,  204 B are substantially similar to one another and are engaged with one of the threaded passageways  216  on the fence  202  in the same orientation. Inasmuch as the thumbs screws  204  are substantially similar, the following description will relate to the second thumb screw  204 B. It should be understood, however, that the description of the second thumb screw  204 B applies equally to the first thumb screw  204 A. 
     Still referring to  FIG. 11 , the thumb screw  204  includes a shaft  220 . The shaft  220  has a first end  220 A, an opposed second end  220 B, and a longitudinal axis that extends from the first end  220 A to the second end  220 B. The shaft  220  includes a threaded portion  222  that extends from the first end  220 A to a blanked portion  224  of the shaft  220 . The threaded portion  222  operably engages with one of the threaded passageways  216 A,  216 B of the set of threaded passageways  216  to maintain the thumb screw  204  inside of the fence  202  (seen in  FIG. 1 ). The blanked portion  224  of the shaft  220  extends from the threaded portion  222  to the second end  220 B of the shaft  220 . As described in more detail herein, the blanked portion  224  operably engages with the at least one fence guide rod  206  when the at least one fence guide rod  206  operably engages the fence  202 . In addition, a knob  226  is provided at the first end  220 A of the shaft  220  for allowing a woodworker to tighten and/or loosen the thumb screw  204  from the fence  202 . Such manipulation of the thumb screw  204  during a drilling operation is described in more detail below. 
     Referring now to  FIG. 13 , the fence assembly  200  includes the at least one guide rod  206 . In the illustrated embodiment, the at least one guide rod  206  includes a first guide rod  206 A and a second guide rod  206 B that operably engage with the fence  202  inside of one of the passageways of the first set of passageways  214 A or one of the passageways of the second set of passageways  214 B. The first guide rod  206 A and the second guide rod  206 B are substantially similar to one another and are engaged with one of the passageways of the first set of passageways  214 A or one of the passageways of the second set of passageways  214 B in the same orientation. Inasmuch as the guide rods  206  are substantially similar, the following description will relate to the first guide rod  206 A. It should be understood, however, that the description of the first guide rod  206 A applies equally to the second guide rod  206 B. 
     Still referring to  FIG. 13 , the first guide rod  206 A has a front end or first end  240 A, an opposed rear end or second end  240 B, and a length “L1” that is measured from the front end  240 A to the rear end  240 B. The first guide rod  206 A has a blanked portion  242  that extends from the front end  240 A to a threaded portion  246 . The first guide rod  206 A defines a set of notches  244  that extends from an outer surface  243  of the blanked portion  230  and into the first guide rod  206 A orthogonally to the longitudinal axis of the first guide rod  206 A. As described later herein, the set of notches  244  are sized and configured to receive a tool (e.g, an open-ended wrench and tools of the like) for further tightening and/or loosening the first guide rod  206 A to the base plate  10 . The threaded portion  246  of the first guide rod  206 A extends from the blanked portion  242  to the rear end  240 B of the first guide rod  206 A. The threaded portion  246  is sized and configured to operably engage with one of the threaded opening in the set of threaded openings  50  on the base plate  10 . In other words, the threaded portion  246  operably threads to one of the threaded opening in the set of threaded openings  50  on the base plate  10 . Such engagement between the guide rods  206 A,  206 B and the set of threaded openings  50 A,  50 B,  50 C, and  50 D is described in more detail below. 
     The first guide rod  206 A also defines a threaded chamber  248  that extends from the first end  240 A towards the second end  240 B relative to the longitudinal axis of the first guide rod  206 A. The threaded chamber  248  is sized and configured to receive one of the locking knobs  20 A,  20 B for further tightening or loosening the first guide rod  206 A from the base plate  10 . In other words, one of the locking knobs  20 A,  20 B may operably thread to the threaded chamber  248  of the first guide rod  206 A for further tightening or loosening the first guide rod  206 A from the base plate  10 . Such engagement between the guide rods  206 A,  206 B and the locking knobs  20 A,  20 B is described in more detail below. 
     As illustrated in  FIGS. 31A and 31B , the flip stop assembly  300  includes, at least one support rod  302  that may operably engage the base plate  10 , at least one extension rod  304  that may operably engage with the at least one guide rod  304 , and at least one flip stop  306  that may operably engage the at least one support rod  302  and the at least one extension rod  304 . In the illustrated embodiment, the at least one support rod  302  operably engages with base plate  10  of the drill guide  1  for operably engaging the at least one flip stop  306  with the base plate  10  for a drilling operation. In one exemplary embodiment, at least one extension rod  304  may be operably engaged to the at least one guide rod  306  for extending the overall length of the flip stop assembly  300 . Such use of the flip stop assembly  300  with the drill guide  1  during a drilling operation is described in more detail below. 
     Referring to  FIG. 26 , the flip stop assembly  300  includes the at least one support rod  302 . In the illustrated embodiment, the at least one support rod  302  includes a single support rod  302  that operably engages with one of the threaded openings in the set of threaded openings  50 . It should be understood, however, that the description of the support rod  302  applies equally to other guide rods that may be included in the flip stop assembly  300 . 
     Still referring to  FIG. 26 , the support rod  302  has a front end or first end  302 A, an opposed rear end or second end  302 B, and a length “L2” that is measured from the front end  302 A to the rear end  302 B. The length “L2” of the support rod  302  and the second guide rod  320 B is substantially equal to the length “L1” of the guide rods  206 A,  206 B of the fence assembly  200 . In one exemplary embodiment, the support rod  302  of the flip stop assembly  300  may be substantially identical to the guide rod  206  of the fence assembly  200 . In the illustrated embodiment, the support rod  302  has a blanked portion  320  that extends from the front end  302 A to a threaded portion  324 . The support rod  302  defines a set of notches  322  that extends from an outer surface  321  of the blanked portion  320  and into the support rod  302 . As described later herein, the set of notches  322  are sized and configured to receive a tool (e.g, an open-ended wrench and tools of the like) for further tightening and/or loosening the support rod  302  to the base plate  10 . The threaded portion  324  of the support rod  302  extends from the blanked portion  320  to the rear end  302 B of the support rod  302 . The threaded portion  324  is sized and configured to operably engage with one of the threaded opening in the set of threaded openings  50  on the base plate  10 . In other words, the threaded portion  324  operably threads to one of the threaded opening in the set of threaded openings  50  on the base plate  10 . Such engagement between the support rod  302  and the set of threaded openings  50 A,  50 B,  50 C, and  50 D is described in more detail below. 
     The support rod  302  also defines a threaded chamber  326  that extends from the first end  302 A towards the second end  302 B relative to the longitudinal axis of the support rod  302 . The threaded chamber  326  is sized and configured to receive one of the locking knobs  20 A,  20 B for further tightening or loosening the support rod  302  from the base plate  10 . In other words, one of the locking knobs  20 A,  20 B may operably thread to the threaded chamber  326  of the support rod  302  for further tightening or loosening the support rod  302  from the base plate  10 . Such engagement between the support rod  302  and the locking knobs  20 A,  20 B is described in more detail below. 
     The flip stop assembly  300  includes the at least one extension rod  304 . In the illustrated embodiment, the at least one extension rod  304  includes a single extension rod  304  that operably engages with support rod  302  for further expanding the overall length of the flip stop assembly  300 . It should be understood, however, that the description of the extension rod  304  applies equally to other expansion rods that may be included in the flip stop assembly  300  for further expanding the length of the flip stop assembly  300 . 
     Still referring to  FIG. 27 , the extension rod  304  has a front end or first end  304 A, an opposed rear end or second end  304 B, and a length “L3” that is measured from the front end  304 A to the rear end  302 B. The length “L3” of the extension rod  304  is greater than the length “L1” of the guide rods  206 A,  206 B of the fence assembly  200  and the length “L2” of the support rod  302  of the flip stop assembly  300 . The extension rod  304  has a blanked portion  340  that extends from the front end  304 A to a threaded portion  344 . The extension rod  304  defines a set of notches  342  that extends from an outer surface  341  of the blanked portion  340  and into the extension rod  304 . As described later herein, the set of notches  342  are sized and configured to receive a tool (e.g, an open-ended wrench and tools of the like) for further tightening and/or loosening the extension rod  304  to the support rod  302  in the flip stop assembly  300 . The threaded portion  344  of the extension rod  304  extends from the blanked portion  340  to the rear end  304 B of the extension rod  304 . The threaded portion  344  is sized and configured to operably engage with the threaded chamber  326  of the support rod  302  to further expand the length of the flip stop assembly  300 . In other words, the threaded portion  344  operably threads to the threaded chamber  326  of the support rod  302  to further expand the length of the flip stop assembly  300 . Such engagement between the expansion rod  304  and the support rod  302  is described in more detail below. 
     The expansion rod  304  also defines a threaded chamber  346  that extends from the first end  304 A towards the second end  304 B. The threaded chamber  346  is sized and configured to receive one of the locking knobs  20 A,  20 B for further tightening the expansion rod  304  to the support rod  302  or loosening the expansion rod  304  from the support rod  302 . In other words, one of the locking knobs  20 A,  20 B may operably thread to the threaded chamber  346  of the expansion rod  304  for further tightening the expansion rod  304  to the support rod  302  or loosening the expansion rod  304  from the support rod  302 . Such engagement between the expansion rod  304  and the locking knobs  20 A,  20 B is described in more detail below. 
     As illustrated in  FIGS. 31A-32D , the flip stop assembly  300  includes the at least one flip stop  306 . In one exemplary embodiment, the at least one flip stop  306  may include a single flip stop  306  (see  FIGS. 32A-32B ) that operably engages with support rod  302  and/or an expansion rod  304  during a drilling operation. In another exemplary embodiment, the at least one flip stop  306  may include a plurality of flip stop  306  (e.g., flip stops  306 A,  306 B, and  306 C) (see  FIGS. 31A-31B and 32C-32D ) that operably engages with support rod  302  and/or an expansion rod  304  during a drilling operation. It should be understood, however, that the description of the flip stop  306  applies equally to other flip stops that may be included in the flip stop assembly  300 . 
     Referring to  FIGS. 28-30 , the flip stop  306  includes a front end  360 A, a rear end  360 B that opposes the front end  360 A, and a longitudinal axis that extends between the front end  360 A and the rear end  360 B. The flip stop  306  also includes a left side or first side  360 C, a right side or second side  360 D that opposes the left side  360 C, and a transverse axis that extends between the left side  360 C and the right side  360 D. The flip stop  306  also includes a top end  360 E, a bottom end  360 F that opposes the top end  360 E, and a vertical axis that extends between the top end  360 E and the bottom end  360 F. 
     In the illustrated embodiment, the flip stop  306  defines a first bore  362 A that extends entirely through the flip stop  306  from the front end  360 A to the rear end  360  relative to the longitudinal axis of the flip stop  306 . As shown in  FIGS. 28 and 29 , the first bore  362 A is disposed proximate to the right side  360 D of the flip stop  306 . As described in more detail below, the first bore  362 A is sized and configured to receive and house a portion of the support rod  302  and/or the expansion rod  304  depending on the position of the flip stop  306  as desired by the woodworker during a drilling operation. The flip stop  306  also defines a second bore  362 B that extends entirely through the flip stop  306  from the front end  360 A to the rear end  360  relative to the longitudinal axis of the flip stop  306 . As shown in  FIGS. 28 and 29 , the first bore  362 A is disposed proximate to the left side  360 C of the flip stop  306 . The flip stop  306  also defines a threaded bore  362 C that extends into the flip stop  306  from the top end  360 A towards the first bore  362 A relative to the vertical axis of the flip stop  306 . As shown in  FIG. 30 , the threaded bore  362 C is disposed proximate to the left side  360 C of the flip stop  306  and is in fluid communication with the first bore  362 A. The flip stop  306  also defines an incline  364  proximate to the front end  360 A of the flip stop  306 . The incline  364  is gradually sloped from the top end  360 E of the flip stop  306  towards the bottom end  360 F of the flip stop  306 . The use of the incline  364  defined by the flip stop  306  is described in more detail below. 
     Still referring to  FIGS. 28-30 , the flip stop  306  also includes a stop arm  366 . In the illustrated embodiment, the stop arm  366  defines an L-shaped configuration that has a first portion  366 A joined to a second portion  366 B in which the second portion  366 B is orthogonal to the first position  366 A. The first portion  366 A of the stop arm  366  defines a main through-hole  368  that extends entirely through the stop arm  366  relative to a transverse axis of the stop arm  366 . The second portion  366 B of the stop arm  366  defines a plurality of through-holes  370  that extends entirely through the stop arm  266  relative to the transverse axis of the stop arm  366 . The main through-hole  368  of the first portion  366 A of the stop arm  366  is sized and configured to receive a fastener  372 A for operably engaging the stop arm  366  to the flip stop  306 . The fastener  372 A is maintained in the flip stop via a nut  372 B operably fastening to the fastener  372 A. As shown in  FIGS. 28 and 29 , the stop arm  366  is oriented away from the flip stop  306  and is rotatable about the fastener  372 A for operably engaging an end or end of a workpiece during a drilling operation. The fastener  372 A defines an axis of rotation “A” along the length of the fastener  372 A in which the stop arm  266  rotates about during a drilling operation. Such rotation and engagement of the stop arm  366  with a workpiece is provided in more detail below. The rotation of the stop arm  366  about the fastener  372 A is also limited due to the incline  364  defined by the flip stop  306 . The stop arm  366  in complementary is shape with the incline  364  defined by the flip stop  306 . 
     In addition, the flip stop  306  may include a washer  367  positioned between the stop arm  366  and the front end  360 A of the flip stop  306  proximate to the incline  364 . The washer  367  may provide rotational support to the stop arm  366  to allow the stop arm  366  to freely rotate about the fastener  372 A. In one exemplary embodiment, the washer  367  may be made from polymer and/or plastic material to allow for ease of rotation between the stop arm  366  and the flip stop  306 . 
     Still referring to  FIGS. 28-30 , the flip stop  306  also includes a thumb screw  374 . The thumb screw  374  has a threaded shaft  374 A that operably engages with the threaded bore  362 C of the flip stop  306  such that the thumb screw  374  operably threads to the flip stop  306 . The thumb screw  374  also includes a knob  374 B provided at one end of the threaded shaft  374 A for allowing a woodworker to tighten or loosen the thumb screw  374  to the flip stop  306 . The thumb screw  374  of the flip stop  306  operably maintains the flip stop  306  at a location along the support rod  302  or the extension rod  304  as desired by the woodworker during a drilling operation. As such, the thumb screw  374  operably engages an end of the threaded shaft  374 A opposite to the knob  374 B to the support rod  302  or the extension rod  304  for maintaining the flip stop  306  at a desired location. 
     Having described the structure of the drill guide  1  and the various components and connections thereof within drill guide  1 , methods of use thereof will now be described. 
     Prior to using the drill guide  1  on a workpiece, a drilling bit must be provided on the drill guide  1 . As illustrated in  FIG. 14A , a woodworker may install a drilling bit  400  with a first diameter “D1” into the drill chuck  100  of the chuck carrier  14 . In this configuration, the woodworker may select a drilling bit  400  that is equal to or less than one inch in diameter. The woodworker using the drill guide  1  would loosen the drill chuck  100  by applying a rotational force on the drill chuck  100  to expanded the chucks of the drill chuck  100  away from one another to define a suitable diameter that is complementary to the first diameter “D1” of the drilling bit  400 . The rotational force applied to the drill chuck  100  is denoted by arrows labeled “R1.” Once the drilling bit  400  is inserted into the drill chuck  100 , the woodworker then applies an opposing rotational force “R1” on the drill chuck  100  to collapse the chucks of the drill chuck  100  towards one another to hold and maintain the drilling bit  400  with the drill chuck  100 . 
     Prior to using the drill guide  1  on a workpiece, the woodworker may then select a suitable depth limit when plunging the drilling bit  400  into a workpiece via the depth stopper  16 . Still referring to  FIG. 14A , the woodworker may linearly move the depth stopper  16  along the tapered portion  74  of the first guide column  12 A until the woodworker determines a suitable height for limiting the movement of the chuck carrier  14  and the plunging action of the drilling bit  400 . The linear movement of the depth stopper  16  is denoted by arrows labeled “B”. During linear movement of the depth stopper  16 , the fastener  124  is disengaged from the tapered portion  74  of the first guide column  12 A to allow the collar  120  to freely move along the first guide column  12 A. Once the woodworker finds a suitable height for limiting the travel of the chuck carrier  14  and the plunging action of the drilling bit  400 , the woodworker tightens the fastener  124  against the tapered portion  74  of the first guide column  12 A to maintain the desired height of the depth stopper  16 . 
     Prior to using the drill guide  1  on a workpiece, the woodworker may utilize the fence assembly  200  during a drilling operation. The woodworker may operably engage at least one guide rod  206  to the base plate  10 . As illustrated in  FIG. 14A , the woodworker may operably engage a first guide rod  206 A and a second guide rod  206 B to the base plate  10  via the set of threaded openings  50 . In the illustrated embodiment, the first guide rod  206 A and the second guide rod  206 B operably thread into the first set of threaded openings  50 A that is defined at the front end  30 A of the base plate  10  via the woodworker apply a rotational force on each of the first guide rod  206 A and the second guide rod  206 B in the clockwise direction. In other exemplary embodiments, the woodworker may operably thread the first guide rod  206 A and the second guide rod  206 B into the second set of threaded openings  50 B that is defined at the rear end  30 B of the base plate  10 , operably thread the first guide rod  206 A and the second guide rod  206 B into the third set of threaded openings  50 C that is defined at the left side  30 C of the base plate  10 , or operably thread the first guide rod  206 A and the second guide rod  206 B into the fourth set of threaded openings  50 D that is defined at the right side  30 D of the base plate  10 . 
     To further tighten the first guide rod  206 A and the second guide rod  206 B into the first set of threaded openings  50 A, the woodworker may remove one of the locking knobs  20 A,  20 B from one of the guide columns  12 A,  12 B by applying a rotational force on one of the locking knobs  20 A,  20 B in a counter-clockwise direction. Once one of the locking knobs  20 A,  20 B is removed from one of the guide columns  12 A,  12 B, the woodworker may then insert the key portion  144  of the locking knob  20  into the threaded chamber  248  of the first guide rod  206 A due to the key portion  144  and the threaded chamber  248  being complementary to one another. Once the locking knob  20  operably engages the first guide rod  206 A, the woodworker may apply a rotational force to the locking knob  20  in the counter-clockwise direction to further tighten the first guide rod  206 A into one of the threaded openings  50 A provided on the front end  30 A of the base plate  10 . The woodworker may repeat the same tightening process to the second guide rod  206 B. Once tightening of the first guide rod  206 A and the second guide rod  206 B are complete, the woodworker may operably engage the locking knob  20  back into the respective guide column  12  by applying a rotational force to the locking knob  20  in a clockwise direction until the locking knob  20  is secured inside of the respective guide column  12 . The woodworker may also use a tool (e.g., open-ended wrench) to further tighten the first guide rod  206 A and the second guide rod  206 B into the first set of threaded openings  50 A via the notches  246  on each of the first guide rode  206 A and the second guide rod  206 B. 
     Optionally, the woodworker may omit the action of setting the depth stopper  16  at a desired height relative to the base plate  10  if desired. Optionally, the woodworker may omit the fence assembly  200  from the drill guide  1  during a drilling operation if desired. 
     Prior to introducing the drill guide to a workpiece “WP”, the woodworker scribes a set of witness lines “WL” at a desired location on the workpiece “WP” to locate the exact point for drilling a hole into the workpiece “WP.” Once the set of witness lines “WL” are scribed on the workpiece “WP,” the woodworker may then introduce the drill guide  1  to the workpiece “WP” and align the drill guide  1  with the set of witness lines “WL” on the workpiece “WP.” The woodworker aligns the drill guide  1  with the set of witness lines “WL” by aligning the guide markers  42  of the base plate  10  with the set of witness lines “WL.” Once aligned, the drilling bit  400  provided on the drill guide  1  is disposed directly above the location to drill a hole into the workpiece “WP.” 
     Once the drill guide  1  and the drilling bit  400  are suitably aligned with the set of witness lines “WL” and above the drilling hole location, the woodworker may then complete assembly of the fence assembly  200 . As illustrated in  FIG. 14C , the woodworker may introduce the fence  202  to the first guide rod  206 A and the second guide rod  206 B in a first orientation relative to the base plate  10  by inserting the first guide rod  206 A and the second guide rod  206 B into one of the first set of passageways  214 A and the second set of passageways  214 B. Prior to engaging the fence  202  with the first and second guide rods  206 A,  206 B, the first and second thumb screws  204 A,  204 B are loosened from the fence  202  until the shafts  220  of the first and second thumbs screws  204 A,  204 B are completely disposed inside of the respective threaded passageway of the set of passageways  216  and away from the respective passageway of the first set of passageways  214 A. As such, the woodworker may apply a rotational force on the knobs  226  of the first and second thumb screws  204 A,  204 B in a counter-clockwise direction to loosen the first and second thumbs screws  204 A,  204 B from the fence  202 . The rotational force applied to the first and second thumb screws  204 A,  204 B is denoted by arrows labeled “R2”. The woodworker may then introduce the fence  202  to the first and second guide rods  206 A,  206 B once the first and second thumb screws  204 A,  204 B are provided in a suitable position where the shafts  220  of the first and second thumbs screws are completely disposed inside of the respective threaded passageway of the set of passageways  216  and away from the respective passageway of the first set of passageways  214 A. 
     Still referring to  FIG. 14C , the woodworker inserts the first guide rod  206 A and the second guide rod  206 B through the first set of passageways  214 A to operably engage the fence  202  to the base plate  10  in the first orientation. The woodworker linearly slides the fence  202  along the first guide rod  206 A and the second guide rod  206 B until the rear end  210 B,  212 B of the fence  202  directly abuts against an outermost end “OE” of the workpiece “WP” (also see  FIG. 15 ). The linear movement of the fence  202  along the first guide rod  206 A and the second guide rod  206 B is denoted by arrows labeled “LM1.” The woodworker may the apply a rotational force “R2” on the knobs  226  of the first and second thumb screws  204 A,  204 B in a clockwise direction to tighten the first and second thumbs screws  204 A,  204 B to the fence  202  and the first and second guide rods  206 A,  206 B to maintain the position of the fence  202  on the first and second guide rods  206 A,  206 B. As such, the first the second thumb screws  204 A,  204 B prevent linear movement of the fence  202  along the first and second guide rods  206 A,  206 B during the drilling operation. Furthermore, the woodworker may select the first orientation for the fence  202  in order to maximize the distance of the fence  202  relative to the drilling bit  400  when provided on the first and second guide rods  206 A,  206 B. 
     While not illustrated herein, a woodworker may use extension rods (such as extensions rods  304 ) to expand the distance of the fence  202  relative to the drilling bit  400  for a substantially larger workpiece that the workpiece “WP” illustrated herein. In one exemplary embodiment, a woodworker may install a set of extensions rods to a set of guide rods for maximizing the distance of a fence relative to a base plate at distance from about six and one-half inches up to about twelve inches. In another exemplary embodiment, a woodworker may install more than one set of extensions to a set of guide rods for maximizing the distance of a fence relative to a base plate at a distance up to about twelve inches per set of extension rods used during a drilling operation. 
     As illustrated in  FIG. 15 , the first and second top surfaces  210 E,  212 E of the fence  202  face in the same direction of the top surface  30 E of the base plate  10  relative to the longitudinal axis “X” of the drill guide  1 . In addition, the fence  202  is positioned away from the base plate  10  at a distance “G 1 ” that is measured from the drilling bit  400  to the rear end  2106  of the fence  202 . In the illustrated orientation, the maximum distance “G 1 ” between the front end  30 A of the base plate  10  to the rear end  2106  of the fence  202  is of about seven and three-quarter inches. 
     Referring now to  FIG. 14D , the woodworker may introduce a portable power drill  402  to the drill guide  1 . Any and all hand drills, handheld drills, electric and battery-operated portable power drills contemplated for use with the drill guide disclosed herein will be referred to hereafter throughout this disclosure by the term “portable drill”. 
     In the illustrated embodiment, the portable power drill  402  includes a drill chuck  404  that may operably engage with the hex bit  96  of the chuck carrier  14  of the drill guide  1 . As shown in  FIG. 14D , the woodworker linearly moves the drill chuck  404  of the portable power drill  402  to the chuck carrier  14  to operably engage the drill chuck  404  with the hex portion  98 A of the hex bit  96 . The linear movement exerted by the woodworker on the portable power drill  402  is denoted by an arrow labeled “LM2.” Any suitable drill chuck provided on portable power drills may be operably engaged to the hex bit  96  of the drill guide  1 . Examples of suitable drill chucks provided on portable power drills include keyed drill chucks, keyless drill chucks, quick release chucks, and any other suitable drill chucks provided on portable power drills. In the illustrated embodiment, the drill chuck  404  of the portable power drill  402  has a keyless drill chuck in which the woodworker loosens the drill chuck  404  by a rotational force in the counter-clockwise direction to match the diameter of the hex bit  96 . Once the diameters of the drill chuck  404  and the hex bit  96  are complementary to one another, the woodworker engages the drill chuck  404  to the hex bit  96  by applying a rotational force in the clockwise direction to tighten the drill chuck  404  to the hex bit  96 . 
     Once the portable power drill  402  is operably engaged to the drill guide  1 , the woodworker may drill a hole into the workpiece “WP.” As illustrated in  FIG. 14E , the woodworker applies a downward linear force on the portable power drill  402  directed towards the base plate  10 . Such downward linear force applied to the portable power drill  402  is shown by an arrow labeled “F1.” As the woodworker applies the downward force to the portable power drill  402 , the chuck carrier  14  and associated parts on the chuck carrier  14  progress towards the base plate  10  and the workpiece “WP.” During this downward linear force, the portable power tool  402  is also applying a rotational force to the hex bit  96 , via the woodworker activating the power of the portable power drill  402 , which transfers to the drill chuck  100  of the chuck carrier  14 . Since the drill chuck  100  of the chuck carrier  14  is rotating, the drilling bit  400  operably engaged to the drill chuck  100  is also rotating with the drill chuck  100  via the rotational force created by the portable power drill  402 . As the drilling bit  400  plunges into the workpiece “WP,” the woodworker may plunge the drilling bit  400  into the workpiece “WP” until the first protrusion  108 A directly abuts and/or hits the depth stopper  16  while plunging the drilling bit  400 . Since the tapered portion  74  gradually increases towards the bottom end  70 B of the first guide column  12 B, the fastener  124  is pressed against the tapered portion  74  causing a self-tightening interaction for preventing the depth stopper  16  from moving downwardly towards the base plate  10 . As such, a sudden hit or strike on the depth stopper  16  by the chuck carrier  14  will not move the depth stopper  16  downwardly due to the interaction between the tapered portion  74  of the first guide column  12 A and the fastener  124  of the depth stopper  16 . 
     Once the woodworker has completed the drilling process and drilled a hole “H” into the workpiece “WP,” the biaser  18  provides assistance to the woodworker for moving the chuck carrier  14  and the portable power drill  402  after performing a drilling operation (see  FIG. 14F ). Here, the biaser  18  assists the woodworker by applying an upward linear force on the chuck carrier  14  and the portable power drill  402  that is directed away from the base plate  10  and away from the workpiece “WP” to move the drilling bit  400  from the workpiece “WP.” Such upward linear force applied to the chuck carrier  14  and the portable power drill  402  by the biaser  18  is shown by an arrow labeled “F2.” In addition, the woodworker may repeat the plunging process and removal process illustrated in  FIGS. 14E and 14F  until a desired hole is drilled into and/or through the workpiece “WP.” 
     As described below and illustrated in  FIGS. 16-21 , the fence assembly  200  provides multiple orientations for allowing the woodworker to drill into a workpiece with different orientations of the fence  202  and different attachment points of the guide rods  206  to the base plate  10 . 
     As illustrated in  FIGS. 16 and 17 , the woodworker may orient the fence  202  on the first and second guide rods  206 A,  206 B in a second orientation relative to the base plate  10 . In the second orientation, the first and second top surfaces  210 E,  212 E of the fence  202  face an opposing direction as compared to the top surface  30 E of the base plate  10  relative to the longitudinal axis “X” of the drill guide  1 . Similar to the first orientation as illustrated in  FIGS. 14A-14F , the first and second guide rods  206 A,  206 B operably engage with the fence  202  via the first set of passageways  214 A. In the illustrated embodiment, second top surface  212 A of the step  212  operably engages with a top surface “TS” of a workpiece “WP.” In this orientation, the fence  202  provides the woodworker with additional support and stability when using the drill guide  10  to drill a hole into the workpiece “WP.” In other words, the fence  202  acts an outrigger that provides the woodworker with additional support and stability when using the drill guide  10  to drill a hole into the workpiece “WP.” 
     Generally, a woodworker would desire this second orientation of the fence  200  as shown in  FIGS. 16 and 17  when the woodworker is drilling a hole into a substantially large workpiece where additional stability is needed to maintain the position and alignment of the drill guide  1  over a drilling location. During a drilling operation, the woodworker would apply a downward linear force onto the bottom surface  210 F of the fence  202  to provide additional support and stability to the drill guide  1  in which the step  212  would act as a cleat or support member. Such downward linear force applied by the woodworker on the bottom surface  210 F of the fence  202  is shown by an arrow labeled “F3” In addition, the fence  202  is positioned away from the base plate  10  at a distance “G 2 ” that is measured from the drilling bit  400  to the rear end  2106  of the fence  202 . In the illustrated orientation, the maximum distance “G1” between the front end  30 A of the base plate  10  to the rear end  210 B of the fence  202  is up to about six and one-half inches. 
     As illustrated in  FIGS. 18 and 19 , the woodworker may orient the fence  202  on the first and second guide rods  206 A,  206 B in a third orientation relative to the base plate  10 . In the third orientation, the first and second top surfaces  210 E,  212 E of the fence  202  face in the same direction as the top surface  30 E of the base plate  10  relative to the longitudinal axis “X” of the drill guide  1 . Similar to the first orientation as illustrated in  FIGS. 14A-14F , the first and second guide rods  206 A,  206 B operably engage with the fence  202  via the first set of passageways  214 A. However, the first and second guide rods  206 A,  206 B enter the fence  200  from front end  210 A and exit at the rear end  210 B. In the third orientation, the front end  210 A of the fence  202  operably engages with an outermost end “OE” of a workpiece “WP” for maintaining a distance between the fence  202  and the drilling bit  400 . In addition, a portion of the fence  202  measured from the front end  210 A towards the rear end  210 B is disposed beneath the base plate  10  where the first top surface  210 A of the fence  202  is adjacent to and faces the bottom surface  30 F of the base plate  10 . 
     Generally, a woodworker would select the third orientation for the fence  202  to minimize the distance between the drilling bit  400  and the fence  202  when drilling a hole proximate to an outermost end “OE” of the workpiece “WP” (seen in  FIGS. 18 and 19 ). During a drilling operation, the woodworker would operably engage the fence  202  to the first and second guide rods  206 A,  206 B by orienting the front end  210 A of the fence  202  at the front end  30 A of the base  10  and having the first and second guide rods  206 A,  206 A enter through the front end  212 A of the step  212  and exit at the rear end  212 B of step  212 . The third orientation of the fence  202  allows the woodworker to have support and stability when drilling holes close to the outermost end of a workpiece, such as the outermost end “OE” of the workpiece “WP” shown in  FIGS. 18 and 19 . As a woodworker moves the drill guide  1  closer to the outermost end “OE” of the workpiece “WP”, the woodworker will also move the front end  210 A of the fence  202  closer to the drilling bit  400  to compensate for the overhang and/or unsupported base plate  10  when resting on the workpiece “WP.” As such, the third orientation of the fence  202  acts as a cantilever in which the front end  210 A of the fence  200  directly abuts the outermost end “OE” of the workpiece “WP” while providing horizontal support to the drill guide  1  during a drilling operation. When the fence  202  is provided in the third orientation, the woodworker may drill a hole into the workpiece “WP” at a distance “G3” measured from the drilling bit  400  to the front end  210 E of the fence  200 . In the illustrated embodiment, a hole may be drilled into a workpiece that is about one-half of an inch away from an outermost end of the workpiece. 
     As illustrated in  FIGS. 20 and 21 , the woodworker may orient the fence  202  on the first and second guide rods  206 A,  206 B in a fourth orientation relative to the base plate  10 . In the fourth orientation, the first and second top surfaces  210 E,  212 E of the fence  202  are substantially orthogonal to the top surface  30 E of the base plate  10  relative to the longitudinal axis “X” of the drill guide  1 . In the fourth orientation, the first and second guide rods  206 A,  206 B operably engaged with the fence  202  via the second set of passageways  214 B as compared to the first, second, and third orientations of the fence  202 . Here, first and second guide rods  206 A,  206 B enter the fence  200  at the bottom end  210 F and exit at the second upper surface  212 E of the step  212 . In the fourth orientation, the bottom surface  210 F of the fence  202  operably engages with an outermost end “OE” of a workpiece “WP” for maintaining a distance between the fence  202  and the drilling bit  400 . 
     Generally, a woodworker would desire the fourth orientation of the fence  200  as shown in  FIGS. 20 and 21  when the woodworker is drilling a hole into a substantially vertical workpiece “WP” and needs additional horizontal support at a distance above the drill guide  1 . During a drilling operation, the woodworker would operably engage the fence  202  to the first and second guide rods  206 A,  206 B by orienting the bottom surface  210 F of the fence  202  at the front end  30 A of the base  10  and having the first and second guide rods  206 A,  206 A enter through the bottom surface  210 F of the fence  200  and exit at the second upper surface  212 E of step  212 . The fourth orientation of the fence  202  allows the woodworker to have horizontal support and stability at an outermost end of a workpiece when drilling holes into a workpiece that is vertically-oriented, such as the workpiece “WP” shown in  FIGS. 20 and 21 . When drilling a hole into the workpiece “WP,” the woodworker may apply a downward linear force onto the first top surface  210 E and/or the second upper surface  212 E of the fence  202  to maintain the position of the drill guide  1  on the vertically-oriented workpiece “WP.” 
     While the first and second guide rods  206 A,  206 B are illustrated as operably engaging the set of threaded openings  50 A at the front end  30 A of the base plate  10 , the first and second guide rods  206 A,  206 B may operably engaging any set of threaded openings  50  defined by the base plate  10 . In one example, a woodworker may desire to operably engage the first and second guide rods  206 A,  206 B to the set of threaded openings  50 B at the rear end  30 B of the base plate  10 . In another example, a woodworker may desire to operably engage the first and second guide rods  206 A,  206 B to the set of threaded openings  50 C at the left side  30 C of the base plate  10 . In another example, a woodworker may desire to operably engage the first and second guide rods  206 A,  206 B to the set of threaded openings  50 D at the right side  30 D of the base plate  10 . 
     As illustrated in  FIGS. 1-7 and 14A-21 , the chuck carrier  14  is provided in a first position relative to the base plate  10 . In the first position, the front end  90 A of the housing  90  of the chuck carrier  14  faces towards the front end  1 A of the drill guide  1 . As illustrated in  FIGS. 1, 6, and 7 , the drill chuck  100  is disposed directly above the base plate  10  and the central opening  32  relative to the vertical axis “Z” of the drill guide  1 . Similarly, the drilling bit  400  is disposed directly above the base plate  10  and the central opening  32  relative to the vertical axis “Z” of the drill guide  1  (see  FIG. 14A ). In addition, the chuck carrier  14  being oriented in the first position requires a maximum diameter for the drilling bit  400 . As stated previously, the maximum diameter of a drilling bit that may be used during a drilling operation when a chuck carrier is provided in a first position is about one inch in diameter. The diameter of the drilling bit  400  is limited due to the overall diameter of the central opening  32  defined by the base plate  10 . In addition, the first position of the chuck carrier  14  allows a woodworker to install and use a drilling bit with a maximum length of about 6.7 inches. 
     However, the chuck carrier  14  of the drill guide  1  may be provided in a second, reversible position. To reverse the orientation of the chuck carrier  14 , a woodworker may loosen each of the first and second locking knobs  20 A,  20 B from each of the first and second guide columns  12 A,  12 B by applying a rotational force on the first and second locking knobs  20 A,  20 B in a counter-clockwise direction. Once the first and second locking knobs  20 A,  20 B have been loosened and removed from the first and second guide columns  12 A,  12 B, the woodworker applies a pulling force on the housing  90  of the chuck carrier  14  directed away from the base plate  10  relative to the vertical axis “Z” of the drill guide  1  to remove the chuck carrier  14  from the guide columns  12 . Once removed, the woodworker then rotates the chuck carrier  14  rotates the chuck carrier  14  about the vertical axis “Z” of the drill guide  1  to have the front end  90 A of the housing  90  face towards the rear end  1 B of the drill guide  1  and opposite to the front end  1 A of the drill guide  1 . Once the chuck carrier  14  is oriented towards the rear end  1 B of the drill guide  1 , the woodworker operably engages the chuck carrier  14  to the guide columns  12  in a reverse orientation. In the second position, the first guide rod  12 A enters through the second rear through-hole  110 B and operably engages with the upper and lower bushings  112 A,  112 B in the second protrusion  108 A. Also in the second position, the second guide rod  12 B enters through the first rear through-hole  110 A and operably engages with the upper and lower bushings  112 A,  112 B in the first protrusion  108 A. Once the chuck carrier  14  is provided on the first and second guide columns  12 A,  12 B, the woodworker then tightens each of the first and second locking knobs  20 A,  20 B to the each of the first and second guide columns  12 A,  12 B by applying a rotational force on the first and second locking knobs  20 A,  20 B in the clockwise direction. 
     Once the chuck carrier  14  is provided in the second position, the drill chuck  100  is positioned away from the base plate  10  and the central opening  32  relative to the longitudinal axis “X” of the drill guide  1 . In addition, a drilling bit  400 ′ with a diameter “D2” that is greater than the diameter “D1” of the drilling bit  400  is also positioned away from the base plate  10  and the central opening  32  relative to the longitudinal axis “X” of the drill guide  1 . Generally, a woodworker would desire this configuration of the drill guide  1  for drilling holes that are greater than one inch in diameter. In one example, the second position of the chuck carrier  14  allows a woodworker to install and use a drilling bit with a maximum diameter of about two inches. As illustrated in  FIG. 22 , a woodworker is able to use different types of drilling bits  400 ′ on the drill guide  1 . Examples of suitable types of drilling bits used when a chuck carrier is provided in a second position include twist drilling bits, flat bottom boring bits such as forstner bits, mortising bits, spade bits, and other suitable types of drilling bits when a chuck carrier is provided in a second position. In addition, the second position of the chuck carrier  14  allows a woodworker to install and use a drilling bit with a maximum length of about seven and one-half inches. 
     While not illustrated herein, a woodworker may install the fence assembly  200  and/or the flip stop assembly when the chuck carrier  14  is provided in the second position. The woodworker may include the fence assembly  200  and/or the flip stop assembly  300  at any set of threaded openings  50 A,  50 B,  50 C,  50 D on the base plate  10  as described and illustrated herein. 
     The drill guide  1  also allows a woodworker to drill holes into a curvilinear and/or rounded workpiece. As illustrated in  FIG. 23 , a woodworker may rest a curvilinear and/or rounded workpiece “RWP” on the top surface  30 E of the base plate  10  via the groove  44 . The groove  44  defined in the base plate  10  provides a structure that allows a circumferential wall “CW” of the curvilinear and/or rounded workpiece “RWP” to rest inside of the base plate  10  so that the curvilinear and/or rounded workpiece “RWP” does not rotate or become misaligned during a drilling operation. In addition, the first and second centering pins  22 A,  22 B may also provide assistance to the drill guide  1  for maintaining the curvilinear and/or rounded workpiece “RWP” on the base plate  10  during a drilling operation. In this situation, the first and second centering pins  22 A,  22 B directly abut the circumferential wall “CW” of the rounded workpiece “RWP” during a drilling operation to provide additional support. If, however, the diameter or the width of the curvilinear and/or rounded workpiece “RWP” is greater than the distance between the first and second centering pins  22 A,  22 B when provided in the stored position on the base plate  10 , the woodworker may loosen and removing the first and second centering pins  22 A,  22 B from the base plate  10 . 
     As previously stated, the first and second centering pins  22 A,  22 B may also be moved from the stored position on the top surface  30 E of the base plate  10  to the centering position on the bottom surface  30 F of the base plate  10 . Generally, a woodworker would desire to use the first and second centering pins in the centering position when the woodworker needs to drill at least one hole in to center of a workpiece, such as a wooden stud. Such use of the first and second centering pins  22 A,  22 B in the centering position is described below and illustrated in  FIGS. 24A and 24B . 
     In order to move the first and second centering pins  22 A,  22 B from a stored position to a centering position, the woodworker may loosen and remove one of the locking knobs  20  from its respective guide column  12  (e.g., first locking knob  20 A). As illustrated in  FIG. 24A , the woodworker inserts the key portion  144  of the locking knob  20  into the passageway  154  of one of the centering pins  22  where the key portion  144  operably engages with the plurality of facets  155  inside of the passageway  154  of the selected centering pin  22 . Once the locking knob  20  operably engages the centering pin  22 , the woodworker applies a rotational force in the counter-clockwise direction on the locking knob  20  to loosen the first centering pin  22  from one of threaded passageways of the set of threaded passageways  52  (e.g., the first thread passageway  52 A). The rotational force applied on the locking knob  20  by the woodworker is denoted by an arrow labeled “S1.” 
     Once the centering pin  22  is loosened and removed from the threaded passageway at the top surface  30 E of the base plate  10 , the woodworker then moves the centering pins  22  to the threaded passageways  52  at the bottom surface  30 F of the base plate  10 . As illustrated in  FIG. 24B , the threaded portion  156  of the centering pin  22  operably engages with the threaded passageway  52  by entering into the threaded passageway  52  from the bottom surface  30 F of the base plate  10 . Once the centering pin  22  operably engages with the threaded passageway  52 , the woodworker applies a rotational force in the clockwise direction on the locking knob  20  to tighten the first centering pin  22  to the threaded passageways. The rotational force applied on the locking knob  20  by the woodworker is denoted by an arrow labeled “S2.” The same technique and procedure may be repeated by woodworker for moving the other centering pin  22  from the stored position to the centering position. 
     Once the centering pins  22  operably engage the base plate  10  at the bottom surface  30 F, a woodworker may introduce the drill guide  1  along with the portable power drill  402  to a center line “CL” on an outermost edge “OE” of a workpiece “WP” as illustrated in  FIG. 25A . As shown in  FIG. 25A , the woodworker may align the centering pins  22 A,  22 B along first and second outermost sides “OS1”, “OS2” of the workpiece “WP” such that the centering pins  22 A,  22 B are directly abutting the outermost sides “OS1”, “OS2” during a drilling operation. Prior to precisely aligning the drilling bit  400  with a predetermined hole location, the first centering pin  22 A is positioned along a first outermost side “OS1” of the workpiece “WP” such that the first centering pin  22 A directly abuts the first outermost side “OS1” of the workpiece “WP”. In addition, the second centering pin  22 B is positioned along an opposed second outermost side “OS2” of the workpiece “WP” such that the second centering pin  22 B directly abuts the second outermost side “OS2” of the workpiece “WP.” Once the pair of centering pins  22  are abutting the first and second outermost sides “OS1”, “OS2” of the workpiece “WP”, the drilling bit  400  of the drill guide  1  may be plunged into the workpiece “WP” and used to drill along center line “CL” to bore a hole into the workpiece “WP”. 
     As illustrated in  FIG. 25A , the drill guide  1  is provided in a first orientation on the workpiece “WP”. In the illustrated embodiment, the first centering pin  22 A abuts the first outermost edge “OS1” at one end of the workpiece “WP” and the second centering pin  22 B abuts the second outermost edge “OS2” at an opposing end of the workpiece “WP”. In addition, the centering pins  22  may abut different locations of the first and second outermost sides “OS1”, “OS2” of the workpiece “WP” to present the drill guide  1  in different orientation on the workpiece “WP”. In one instance, the woodworker may rotate the drill guide  1  about the vertical axis “Z” to a second orientation until the first centering pins  22 A abuts an opposing end of the workpiece “WP” on the first outermost side “OS1” and the second centering pins  22 B abuts an opposing end of the workpiece “WP” on the second outermost side “OS2.” The orientations of centering pins  22  on the drill guide  1  allows a woodworker to manipulate the drill guide to his/her desire when drilling a center hole in a workpiece “WP.” Additionally, the centering pins  22  on the drill guide  1  may accommodate certain widths of workpieces when drilling a centering hole. In one exemplary embodiment, the centering pins  22  of the drill guide  1  may accommodate a workpiece defining a width up to about 3⅛ inches. 
     As illustrated in  FIGS. 31A and 31B , a woodworker may operably engage the flip stop assembly  300  to the drill guide  1  for a drilling operation. In the illustrated embodiment, the fence assembly  200  is operably engaged to the set of threaded openings  50 A defined at the front end  30 A of the base plate  10 . 
     Prior to introducing the drill guide  1  with the flip stop assembly  300 , the woodworker may operably engage the support rod  302  into base plate  10  at any set of threaded openings  50  defined on the base plate  10 . In the illustrated embodiment, support rod  302  operably engages with base plate  10  at a threaded opening in the set of threaded openings  50 D defined at the right side  30 D of the base plate  10 . The woodworker may also operably engage one of the locking knobs  20  within the threaded passageway  326  of the support rod  302  to further tighten the support rod  302  to the base plate  10 . Such use of the removing one of the locking knob  20  from one of the guide columns  12  is described above. Once the support rod  302  operably engages with the selected threaded opening in the set of threaded openings  50 D defined at the right side  30 D of the base plate  10 , the woodworker may operably engage the support rod  302  to the base plate  10 . The woodworker may also operably engage a tool (e.g., an opened-end wrench) to the support rod  302  inside of the pair of notches  322  to further tighten the support rod  302  to the base plate  10 . 
     The woodworker may also operably engage at least one extension rod  304  with the support rod  302 . As illustrated in  FIGS. 31A and 31B , the threaded portion  344  of the at least one extension rod  304  operably engages with the threaded chamber  326  of the support rod  302  where the at least one extension rod  304  is operably engaged with the base plate  10  via the support rod  302 . The woodworker may also operably engage a tool (e.g., an opened-end wrench) to the at least one extension rod  304  inside of the pair of notches  342  to further tighten the at least one extension rod  304  to the support rod  302 . The woodworker may also operably engage one of the locking knobs  20  within the threaded passageway  326  of the support rod  302  or another tool similar to the locking knob  20  (e.g., a driving tool) into the at least one extension rod  304  inside of the threaded chamber  326  to further tighten the at least one extension rod  304  to the support rod  302 . In other exemplary embodiment, the woodworker may operably engage any suitable number of extensions rod  304  to the base plate  10  based on particular embodiment, such as the number of flip stop  306  desired by the woodworker during a drilling operation. Example numbers of extension rods that may be operably engaged to a base plate include zero, one, at least one, two, a plurality, three, four, and other suitable numbers of extension rods that may be operably engaged to a base plate. 
     Optionally, the woodworker may remove one of the centering pins  22  from its stored position on the base plate  10  (operably engaged to the top surface  30 E of the base plate  10  inside one of the threaded passageways in the set of threaded passageways  52 ). In this example, the woodworker may operably engage the selected centering pin  22  into base plate  10  at any set of threaded openings  50  defined on the base plate  10 . As such, the selected centering pin  22  operably engages with base plate  10  at a threaded opening in the set of threaded openings  50 D defined at the right side  30 D of the base plate  10 . The woodworker may also operably engage one of the locking knobs  20  within the passageway  154  of the selected centering pin  22  to further tighten the centering pin  22  to the base plate  10 . Such use of the removing one of the locking knob  20  from one of the guide columns  12  is described above. Once the centering pin  22  operably engages with the selected threaded opening in the set of threaded openings  50 D defined at the right side  30 D of the base plate  10 , the woodworker may operably engage at least one extension rod  304  to the base plate  10 . The woodworker may then operably engage the threaded portion  344  of the at least one extension rod  304  to the centering pin  22  inside of the passageway  154 . The woodworker may also operably engage a tool (e.g., an opened-end wrench) to the at least one extension rod  304  inside of the pair of notches  342  to further tighten the at least one extension rod  304  to the base plate  10 . 
     The woodworker may also operably engage at least one flip stop  306  (such as flip stop  306 A) to the support rod  302  and the at least one extension rod  304 . As illustrated in  FIG. 31B , the woodworker introduces at least one flip stop  306  to the at least one extension rod  304  by passing the at least one extension rod  304  through the first bore  362 A of the at least one flip stop  306 . The at least one extension rod  304  enters the at least one flip stop  306  from the rear end  360 B of the at least one flip stop  306  and exits out at the front end  360 A of the at least one flip stop  306 . During assembly of the flip stop assembly  300 , the woodworker may position the at least one flip stop  306  at any suitable length along the support rod  302  or the at least one extension rod  304 . In addition, the woodworker may operably engage a second flip stop  306 B and a third flip stop  306 C from the at least one flip stop  306  to the support rod  302  and the at least one extension rod  304  substantially similar to the first flip stop  306 A operably engaging to the support rod  302  and the at least one extension rod  304  (see  FIG. 31B ). 
     Once the woodworker has operably engaged each of the first flip stop  306 A, second flip stop  306 B, and the third flip stop  306 C to the support rod  302  and the at least one extension rod  304 , the woodworker may introduce the drill guide  1 , along with the fence assembly  200  and the fence assembly  300 , to a workpiece “WP”. As illustrated in  FIG. 32A , the woodworker aligns the guide markers  42  defined on the base plate  10  with a first set of witness lines “WL1” scribed on the workpiece “WP” by the woodworker. 
     During the alignment of the guide markers  42  with the first set of witness lines “WL1”, the fence  202  may abut a first outermost end “OE 1 ” of the workpiece “WP”. In the illustrated embodiment, the fence  202  is provided in the first orientation (as illustrated in  FIGS. 14C-14F ) where the rear end  210 B of the fence  200  directly abuts against the first outermost end “OE 1 ” of the workpiece “WP”. During alignment, the fence  202  is also moveable along the first and second guide rods  206 A,  206 B in order to allow the woodworker to precisely and accurately align the drilling bit  400  at the point where the witness lines “WL1” intersect. In addition, the first flip stop  306 A may abut a second outermost end “OE 2 ” of the workpiece “WP” where the second outermost end “OE 2 ” is orthogonal to the first outermost end “OE 1 ” on the workpiece “WP”. In the illustrated embodiment, the stop arm  366  of the first flip stop  306 A directly abuts against the second outermost end “OE 2 ” of the workpiece “WP” where the flip stop assembly  300  is positioned orthognal to the fence assembly  200  relative to the transverse axis “Y”. During alignment, the first flip stop  306 A is also moveable along the support rod  302  and the at least one extension rod  304  in order to allow the woodworker to precisely and accurately align the drilling bit  400  at the point where the witness lines “WL1” intersect. 
     Once the guide markers  42  are aligned with the first set of witness lines “WL1”, the woodworker may adjust the fence  202  and the first flip stop  306 A accordingly. As illustrated in  FIG. 32A , the fence  202  is provided at a fence distance “FD” that is measured from the rear end  210 B of the fence  200  to the drilling bit  400 . Once the woodworker has determined the fence distance “FD” for the fence  202 , the woodworker tightens the thumb screw  204 A,  204 B of the fence  202  to the guide rods  206 A,  206 B in order for the fence  202  to maintain the fence distance “FD” from the drilling bit  400 . In addition, the first flip stop  306 A of the at least one flip stop  306  may be positioned at a first distance “FS1” away from the drilling bit  400  that is measured from the stop arm  366  of the first flip stop  306 A to the drilling bit  400  of the drill guide  1 . Once the woodworker has determined the first distance “FS1” for the first flip stop  306 A, the woodworker tightens the thumb screw  374  of the first flip stop  306 A to the support rod  302  or the at least one extension rod  304  in order for the first flip stop  306 A to maintain the first distance “FS1” from the drilling bit  400 . The woodworker then rotates the stop arm  366  downwardly about the first axis of rotation “A” defined along the length of the fastener  372 A in order for the stop arm  366  to operably engage the second outermost edge “OE 2 ”. Once the fence  202  and the stop arm  366  of the first flip stop  306 A operably engage the first outermost end “OE 1 ” and the second outermost end “OE 2 ” of the workpiece “WP”, the woodworker may drill a first hole “H1” into the workpiece “WP” based on the first set of witness lines “WL1”. 
     As illustrated in  FIG. 32A , the engagement of the fence  202  and the stop arm  366  of the first flip stop  306 A provides additional stability to the drill guide  1  where the fence  202  and the first flip stop  306 A maintain the position of the drill guide  1  at the first set of witness lines “WL1”. Here, the fence  202  and the first flip stop  306 A act as stoppers and prevent movement of the drill guide  1  in both a longitudinal direction and a transverse direction when resting on the workpiece “WP”. During a drilling operation, the woodworker may simply apply force to the drill guide  1 , the fence assembly  200 , and/or the flip stop assembly  300  that is directed towards the rear end  1 B of the drill guide  1  and/or directed towards the left side  1 D of the drill guide  1  to maintain the position of the drill guide  1  over the first set of witness lines “WL1” during a drilling operation. 
     Once the woodworker has completed drilling the first hole “H1” into the workpiece “WP”, the woodworker may then rotate the stop arm  366  upwardly about the first axis of rotation “A” defined along the length of the fastener  372 A in order for the stop arm  366  to operably disengage from the second outermost edge “OE 2 ”. The rotation of the stop arm  366  is denoted by an arrow labeled “R3”. Once disengaged, the woodworker may slide the drill guide  1  along with the fence assembly  200  and the flip stop assembly  300  away from the first set of witness lines “WL1” to a second set of witness lines “WL2” scribed on the workpiece “WP”. During this movement, the fence  202  of the fence assembly  200  may be maintained at the fence distance “FD” to eliminate redundant alignment and adjustment of the guide markers  42  with the second set of witness lines “WL2”. 
     As the guide markers  42  of the base plate  10  align with the second set of witness lines “WL2”, the woodworker may adjust the second flip stop  306 B based on the alignment between the guide markers  42  of the base plate  10  align with the second set of witness lines “WL2”. As illustrated in  FIG. 32C , the second flip stop  306 B of the at least one flip stop  306  may be positioned at a second distance “FS2” away from the drilling bit  400  that is measured from the stop arm  366  of the second flip stop  306 B to the drilling bit  400  of the drill guide  1 . In the illustrated embodiment, the second distance “FS2” of the second flip stop  306 B is greater than the first distance “FS1” of the first flip stop  306 A. Once the woodworker has determined the second distance “FS2” for the second flip stop  306 B, the woodworker tightens the thumb screw  374  of the second flip stop  306 B to the support rod  302  or the at least one extension rod  304  in order for the second flip stop  306 B to maintain the second distance “FS2” from the drilling bit  400 . The woodworker then rotates the stop arm  366  of the second flip stop  306 B downwardly about the axis of rotation “A” defined along the length of the fastener  372 A in order for the stop arm  366  to operably engage the second outermost edge “OE 2 ”. Once the fence  202  and the stop arm  366  of the second flip stop  306 B operably engage the first outermost end “OE 1 ” and the second outermost end “OE 2 ” of the workpiece “WP”, the woodworker may drill a second hole “HZ” into the workpiece “WP” based on the second set of witness lines “WL2”. 
     Once the woodworker has completed drilling the second hole “HZ” into the workpiece “WP”, the woodworker may then rotate the stop arm  366  of the second flip stop  306 B upwardly about the axis of rotation “A” defined along the length of the fastener  372 A in order for the stop arm  366  to operably disengage from the second outermost edge “OE 2 ”. Once disengaged, the woodworker may slide the drill guide  1  along with the fence assembly  200  and the flip stop assembly  300  away from the second set of witness lines “WL2” to a third set of witness lines “WL3” scribed on the workpiece “WP”. During this movement, the fence  202  of the fence assembly  200  may be maintained at the fence distance “FD” to eliminate redundant alignment and adjustment of the guide markers  42  with the third set of witness lines “WL3”. 
     As the guide markers  42  of the base plate  10  align with the third set of witness lines “WL3”, the woodworker may adjust the third flip stop  306 C based on the alignment between the guide markers  42  of the base plate  10  align with the third set of witness lines “WL3”. As illustrated in  FIG. 32D , the third flip stop  306 C of the at least one flip stop  306  may be positioned at a third distance “FS3” away from the drilling bit  400  that is measured from the stop arm  366  of the second flip stop  306 B to the drilling bit  400  of the drill guide  1 . In the illustrated embodiment, the third distance “FS3” of the third flip stop  306 C is greater than the first distance “FS1” of the first flip stop  306 A and the second distance “FS2” of the second flip stop  306 B. Once the woodworker has determined the third distance “FS3” for the third flip stop  306 C, the woodworker tightens the thumb screw  374  of the third flip stop  306 C to the support rod  302  or the at least one extension rod  304  in order for the third flip stop  306 C to maintain the third distance “FS3” from the drilling bit  400 . The woodworker then rotates the stop arm  366  of the third flip stop  306 C downwardly about the axis of rotation “A” defined along the length of the fastener  372 A in order for the stop arm  366  to operably engage the second outermost edge “OE 2 ”. Once the fence  202  and the stop arm  366  of the third flip stop  306 C operably engage the first outermost end “OE 1 ” and the second outermost end “OE 2 ” of the workpiece “WP”, the woodworker may drill a third hole “H3” into the workpiece “WP” based on the third set of witness lines “WL3”. 
     While not illustrated herein, the woodworker may keep the arrangement of the fence  202  on the guide rods  206 A,  206 B and the flip stops  306 A,  306 B,  306 C on the support rod  302  and the at least one extension rod  304  for drilling a similar hole arrangement on the same workpiece “WP” or an entirely different workpiece. In other words, the measured arrangement of the fence  202  and the flip stops  306 A,  306 B,  306 C on the drill guide  1  allows a woodworker to simply align the fence  202  with a first outermost end of a workpiece and one of the flip stops  306  with a second outermost end of a workpiece without measuring and scribing new set of witness lines on the workpiece as described above and illustrated in  FIGS. 32A-32D . As such, the measured arrangement of the fence  202  and the flip stops  306 A,  306 B,  306 C on the drill guide  1  eliminates redundant alignment and adjustment performed by the woodworker when drilling a new set of holes into the same workpiece or a different workpiece. 
     While the at least one flip stop  306  comprises of first, second and third flip stops  306 A,  306 B,  306 C, any suitable number of flip stop may be provided with a drill guide based on a particular embodiment, such as the size, shape, and configuration of a workpiece being drill into via a drill guide. Example numbers of flip stops that may be provided with a drill guide includes zero, one, at least one, two, a plurality, three, four, five, and any other suitable amount of flip stops that may be provided with a drill guide. 
       FIG. 33  illustrates a method  500  of using a portable power drill with a drill guide. Initial step  502  of method  500  may include operably engaging a drilling bit into a chuck of a chuck carrier of the drill guide. Another step  504  may include aligning a set of witness lines on a workpiece with guide markers provided on a base plate of the drill guide. Another step  506  may include setting a depth stopper to a desired height on a tapered portion of a first guide column of the drill guide. Another step  508  may include operably engaging a drill chuck of the portable drill with the chuck of the chuck carrier. Another step  510  may include collectively moving the portable drill and the chuck carrier along the first guide column towards an opening defined by the base plate. Another step  512  may include self-tightening the depth stopper about the first guide column as the chuck carrier moves towards the opening. Another step  514  may include drilling a hole into the workpiece with the drilling bit. 
     In an exemplary embodiment, method  500  may include additional steps of using a portable power drill with a drill guide. An optional step may include the step of collectively moving the portable drill and the chuck carrier away from the base plate via a biaser provided on a second guide column of the drill guide. Optional steps may further include the steps of rotating the chuck carrier from a first position where the drilling bit aligns with the opening in the base plate to a second position where the drilling bit is located outwardly away from the base plate; disengaging the drilling bit from the chuck carrier; and engaging another drilling bit of a greater diameter with the chuck carrier. Optional steps may further include the steps of removing a first lock knob from the first guide column of the drill base when the chuck carrier is in the first position; disengaging the chuck carrier from the first guide column; rotating the chuck carrier to the second position; reengaging the chuck carrier in the second position with the first guide column; and operably engaging the first lock knob with the first guide column to maintain the chuck carrier in the second position. Optional step may further include the steps of removing a first centering pin from a first stored position on a top surface of the base plate; removing a second centering pin from a second stored position on the top surface of the base plate; operably engaging the first centering pin at a bottom surface of the base plate in a first centering position; operably engaging the second centering pin at the bottom surface of the base plate in a second centering position; and locating the workpiece between the first centering pin and the second centering pin on the bottom surface of the base plate. An optional step may include the step of positioning a workpiece into a groove defined by the base plate, wherein the workpiece defines a curvilinear shape. Optional steps may further include the steps of operably engaging at least one guide rod with a first end of the base plate; operably engaging a fence with the at least one guide rod; and positioning a top surface of the fence adjacent to a bottom surface of the base plate. Optional steps may further include the steps of operably engaging at least one guide rod with a first end of the base plate; operably engaging a fence with the at least one guide rod; positioning the fence a first distance away from the drilling bit; and abutting a rear end of the fence to a first outermost edge of the workpiece. Optional steps may further include the steps of operably engaging a support rod with a first side of the base plate; operably engaging a flip stop with the support rod; positioning the flip stop at a second distance away from the drilling fence; and abutting a stop arm of the flip stop to a second outermost edge of the workpiece, wherein the stop arm is orthogonal to the rear end of the fence. 
       FIG. 34  illustrates a method  600  of guiding a portable drill with a drill guide. An initial step  602  may include operably engaging the portable drill to a drill guide. Another step  604  may include engaging at least one guide rod to a base plate of the drill guide. Another step  606  may include placing the base plate of the drill guide on a workpiece. Another step  608  may include engaging a fence of the drill guide with the at least one guide rod. Another step  610  may include positioning the fence against the workpiece. Another step  612  may include maintaining a drilling bit on the drill guide at a predetermined location on the workpiece. 
     In an exemplary embodiment, method  600  may include additional steps of guiding a portable drill with a drill guide. An optional step may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a top surface of the workpiece; wherein the positioning of the fence against the workpiece includes placing a rear end of the fence on a side surface of the workpiece that is substantially perpendicular to the top surface of the workpiece; and positioning the fence at a distance away from the drilling bit via the at least one guide rod. An optional step may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a top surface of the workpiece; wherein the positioning of the fence against the workpiece includes placing a front end of the fence on a side surface of the workpiece that is substantially perpendicular to the top surface of the workpiece; and positioning a portion of a top surface of the fence adjacent to a bottom surface of the base plate. An optional step may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a top surface of the workpiece; placing an upper surface of the fence on the top surface of the workpiece; and positioning the fence a distance away from the drilling bit via the at least one guide rod. An optional step may further provide that the step of placing of the base plate of the drill guide on the workpiece includes placing the base plate on a side surface of the workpiece; wherein the positioning of the fence against the workpiece includes placing a bottom surface of the fence on the top surface of the workpiece; and positioning the fence a distance away from the drilling bit via the at least one guide rod. 
       FIG. 35  illustrates a method  700  of guiding a portable drill with a drill guide. An initial step  702  may include engaging a first assembly with a base plate of a drill guide. Another step  704  may include placing the base plate on a surface of a workpiece. Another step  706  may include retaining the base plate in a longitudinal position relative to a first edge of the workpiece, wherein the first edge is orthogonal to the surface of the workpiece. Another step  708  may include orienting a second assembly orthogonally to the first assembly. Another step  710  may include engaging the second assembly with the base plate of the drill guide. Another step  712  may include retaining the base plate in a transverse position relative to a second edge of the workpiece, wherein the second edge is orthogonal to the first edge. 
     In an exemplary embodiment, method  700  may include additional steps of guiding a portable drill with a drill guide. Optional step may further provide steps of locating a drilling bit of the drill guide at a predetermined location on the surface of the workpiece; rotating the drilling bit; and drilling a hole into the workpiece along a straight line. Optional steps may include the steps of inserting the at least one guide rod through the first aperture defined on the fence; placing the base plate on a top surface of the workpiece; placing a rear end of the fence on a side surface of the workpiece that is substantially perpendicular to the top surface of the workpiece; and positioning the fence at a distance away from the base plate via the at least one guide rod. Optional steps may include the steps of inserting the at least one guide rod through the first aperture defined on the fence; placing the base plate on a top surface of the workpiece; placing a front end of the fence on a side surface of the workpiece that is substantially perpendicular to the top surface of the workpiece; and positioning a portion of a top surface of the fence place adjacent to a bottom surface of a base plate when the fence is disposed beneath the base plate. Optional steps may include the steps of inserting the at least one guide rod through the first aperture defined on the fence; placing the base plate on a top surface of the workpiece; placing a top end of the fence on top surface of the workpiece; and positioning the fence at a distance away from the base plate via the at least one guide rod. Optional steps may include the steps of inserting the at least one guide rod though the second aperture defined on the fence; placing the base plate on a side surface of the workpiece; placing a top end of the fence on the top surface of the workpiece; and positioning the fence at a distance away from the base plate via the at least one guide rod. Optional steps may include the steps of choosing to operably engage at least one extension rod to a second wall of the base plate of the drill guide; operably engaging at least one flip stop to the at least one extension rod disposed perpendicularly to the fence; positioning the fence at a first distance from the base plate via the at least one guide rod; and positioning the at least one flip stop at a second distance from the base plate via the at least on extension rod, wherein the second distance is greater than the first distance. Optional steps may include the steps of choosing to operably engage at least one extension rod to a second wall of the base plate of the drill guide; operably engaging a first flip stop to the at least one extension rod disposed perpendicularly to the fence and disposed at a first distance from the base plate; and operably engaging a second flip stop to the at least one extension rod disposed perpendicularly to the fence and disposed at a second distance from the base plate that is greater than the first distance of the first flip stop. 
     Various inventive concepts may be embodied as one or more methods, of which an example has been provided. The acts performed as part of the method may be ordered in any suitable way. Accordingly, embodiments may be constructed in which acts are performed in an order different than illustrated, which may include performing some acts simultaneously, even though shown as sequential acts in illustrative embodiments. 
     While various inventive embodiments have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and/or structures for performing the function and/or obtaining the results and/or one or more of the advantages described herein, and each of such variations and/or modifications is deemed to be within the scope of the inventive embodiments described herein. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the inventive teachings is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific inventive embodiments described herein. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, inventive embodiments may be practiced otherwise than as specifically described and claimed. Inventive embodiments of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the inventive scope of the present disclosure. 
     The articles “a” and “an,” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to mean “at least one.” The phrase “and/or,” as used herein in the specification and in the claims (if at all), should be understood to mean “either or both” of the elements so conjoined, i.e., elements that are conjunctively present in some cases and disjunctively present in other cases. Multiple elements listed with “and/or” should be construed in the same fashion, i.e., “one or more” of the elements so conjoined. Other elements may optionally be present other than the elements specifically identified by the “and/or” clause, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, a reference to “A and/or B”, when used in conjunction with open-ended language such as “comprising” can refer, in one embodiment, to A only (optionally including elements other than B); in another embodiment, to B only (optionally including elements other than A); in yet another embodiment, to both A and B (optionally including other elements); etc. As used herein in the specification and in the claims, “or” should be understood to have the same meaning as “and/or” as defined above. For example, when separating items in a list, “or” or “and/or” shall be interpreted as being inclusive, i.e., the inclusion of at least one, but also including more than one, of a number or list of elements, and, optionally, additional unlisted items. Only terms clearly indicated to the contrary, such as “only one of” or “exactly one of,” or, when used in the claims, “consisting of,” will refer to the inclusion of exactly one element of a number or list of elements. In general, the term “or” as used herein shall only be interpreted as indicating exclusive alternatives (i.e. “one or the other but not both”) when preceded by terms of exclusivity, such as “either,” “one of,” “only one of,” or “exactly one of.” “Consisting essentially of,” when used in the claims, shall have its ordinary meaning as used in the field of patent law. 
     As used herein in the specification and in the claims, the phrase “at least one,” in reference to a list of one or more elements, should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements. This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase “at least one” refers, whether related or unrelated to those elements specifically identified. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B,” or, equivalently “at least one of A and/or B”) can refer, in one embodiment, to at least one, optionally including more than one, A, with no B present (and optionally including elements other than B); in another embodiment, to at least one, optionally including more than one, B, with no A present (and optionally including elements other than A); in yet another embodiment, to at least one, optionally including more than one, A, and at least one, optionally including more than one, B (and optionally including other elements); etc. 
     When a feature or element is herein referred to as being “on” another feature or element, it can be directly on the other feature or element or intervening features and/or elements may also be present. In contrast, when a feature or element is referred to as being “directly on” another feature or element, there are no intervening features or elements present. It will also be understood that, when a feature or element is referred to as being “connected”, “attached” or “coupled” to another feature or element, it can be directly connected, attached or coupled to the other feature or element or intervening features or elements may be present. In contrast, when a feature or element is referred to as being “directly connected”, “directly attached” or “directly coupled” to another feature or element, there are no intervening features or elements present. Although described or shown with respect to one embodiment, the features and elements so described or shown can apply to other embodiments. It will also be appreciated by those of skill in the art that references to a structure or feature that is disposed “adjacent” another feature may have portions that overlap or underlie the adjacent feature. 
     Spatially relative terms, such as “under”, “below”, “lower”, “over”, “upper”, “above”, “behind”, “in front of”, and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is inverted, elements described as “under” or “beneath” other elements or features would then be oriented “over” the other elements or features. Thus, the exemplary term “under” can encompass both an orientation of over and under. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, the terms “upwardly”, “downwardly”, “vertical”, “horizontal”, “lateral”, “transverse”, “longitudinal”, and the like are used herein for the purpose of explanation only unless specifically indicated otherwise. 
     Although the terms “first” and “second” may be used herein to describe various features/elements, these features/elements should not be limited by these terms, unless the context indicates otherwise. These terms may be used to distinguish one feature/element from another feature/element. Thus, a first feature/element discussed herein could be termed a second feature/element, and similarly, a second feature/element discussed herein could be termed a first feature/element without departing from the teachings of the present invention. 
     An embodiment is an implementation or example of the present disclosure. Reference in the specification to “an embodiment,” “one embodiment,” “some embodiments,” “one particular embodiment,” “an exemplary embodiment,” or “other embodiments,” or the like, means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily all embodiments, of the invention. The various appearances “an embodiment,” “one embodiment,” “some embodiments,” “one particular embodiment,” “an exemplary embodiment,” or “other embodiments,” or the like, are not necessarily all referring to the same embodiments. 
     If this specification states a component, feature, structure, or characteristic “may”, “might”, or “could” be included, that particular component, feature, structure, or characteristic is not required to be included. If the specification or claim refers to “a” or “an” element, that does not mean there is only one of the element. If the specification or claims refer to “an additional” element, that does not preclude there being more than one of the additional element. 
     As used herein in the specification and claims, including as used in the examples and unless otherwise expressly specified, all numbers may be read as if prefaced by the word “about” or “approximately,” even if the term does not expressly appear. The phrase “about” or “approximately” may be used when describing magnitude and/or position to indicate that the value and/or position described is within a reasonable expected range of values and/or positions. For example, a numeric value may have a value that is +/−0.1% of the stated value (or range of values), +/−1% of the stated value (or range of values), +/−2% of the stated value (or range of values), +/−5% of the stated value (or range of values), +/−10% of the stated value (or range of values), etc. Any numerical range recited herein is intended to include all sub-ranges subsumed therein. 
     Additionally, the method of performing the present disclosure may occur in a sequence different than those described herein. Accordingly, no sequence of the method should be read as a limitation unless explicitly stated. It is recognizable that performing some of the steps of the method in a different order could achieve a similar result. 
     In the claims, as well as in the specification above, all transitional phrases such as “comprising,” “including,” “carrying,” “having,” “containing,” “involving,” “holding,” “composed of,” and the like are to be understood to be open-ended, i.e., to mean including but not limited to. Only the transitional phrases “consisting of” and “consisting essentially of” shall be closed or semi-closed transitional phrases, respectively. 
     In the foregoing description, certain terms have been used for brevity, clearness, and understanding. No unnecessary limitations are to be implied therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes and are intended to be broadly construed. 
     Moreover, the description and illustration of various embodiments of the disclosure are examples and the disclosure is not limited to the exact details shown or described.