Abstract:
A dadoing system that can be set up to cut multiple dados in a workpiece. The dadoing system uses a sliding channel clamp to keep the workpiece from moving in a transverse direction, while the dados are being cut into the workpiece. The sliding guide rails are used to put downward pressure on a workpiece while guiding a router across the workpiece during the dadoing process. Once the system is set up to cut the dados in the desired locations on the workpiece, the sliding guide rail stops can be secured into place. The stops will insure that the sliding guide rails are set up in the same place thus allowing multiple workpieces to have matching dados that line up properly during assembly.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    “Not Applicable” 
       STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
       [0002]    “Not Applicable” 
       BACKGROUND OF THE INVENTION 
       [0003]    1. Field of Invention 
         [0004]    The present invention relates generally to the field of woodworking, more specifically to cabinet and furniture making, and relates to a system for holding a workpiece in place with sliding guide rails that are tightened down in strategic places so that a hand held power tool can perform the needed task. 
         [0005]    2. Prior Art 
         [0006]    Prior art teaches that the router is the best solution for cutting clean dados and grooves. The reason for using a router over other tools such as a table saw would be that a router bit is cutting across the grain while the table saw blade is rotating downward. This downward rotation will pull the veneer down and away from the substrate that the veneer is glued to. This pulling down and away from the substrate causes the veneer to break off and leave the substrate underneath the veneer exposed, thus leaving an undesirable result on the workpiece. 
         [0007]    (A) Other prior arts have attempted to make dadoing easier and a more efficient operation. One such prior art would be U.S. Pat. No. 5,682,934 patented on Nov. 4, 1997—Class 144/Sub-Class 144.51 to Richard C. Rybski, which teaches a system that has a base, which a router or other power tools can ride between two angle irons. While this will give a clean dado and a straight cut, the operator will have to stop and reset the system for each dado or cut made. Also the cutouts for the hold-downs are placed so that the operator must position the workpiece in a fashion where the workpiece can be held down without the hold-downs being in the way of the router or tool being used. Another problem with this system is there is no place for calibrated measurement means to help in the setup of the workpiece in relation to the tool guide. This will make it very hard and time consuming to make accurate repetitive cuts or dados. 
         [0008]    (B) Another prior art would be patent No. 4,966,507 patented on Oct. 30, 1990—Class 409/Sub-Class 175 to Robert Hanks. One problem with this router jig is that the clamping mechanism comprising of two boards that hold the workpiece in place are adjustable and therefore will need careful attention during the setup process to make sure that the workpiece is square to the base plate portion of the jig. Another problem with the jig is the horizontal and vertical guides. Even though the guides are adjustable with a suitable calibrated measurement means on them, it will still be difficult to insure that the guides are square to the workpiece. The reason for this is that both the vertical and horizontal guides will have some play in them since they are adjustable. This play on the guides can cause the calibrated measurement means to be off, making it possible for the dados to be out of square on the workpiece. 
         [0009]    (C) U.S. Pat. No. 3,770,031 patented on Nov. 6, 1973—Class 144/Sub-Class 136 R to Eugene T. Olson for a routing fixture. This fixture will have to have repeated setups for each dado that is cut into the workpiece. This is time consuming and it will be very difficult to align the workpiece and the bit that is in the router to the precise area that is marked for the dado on the workpiece. It also would be very hard to cut perfectly matching dados in a workpiece. 
         [0010]    (D) U.S. Pat. No. 4,215,731 patented on Aug. 5, 1978—Class 144/Sub-Class 136 C to Douglas E. Maynard for a router guide assembly. One problem with this router guide is that the workpiece must be moved after each dado is made. Then the workpiece must be moved to line up with the notch in the fence so that the bit is not damaged as the bit exits the workpiece. Another problem is setting up the depth of the router bit. The operator of the router must allow for the extra distance between the router carriage and the workpiece. There also is a problem as far as lining the workpiece up with the with the router bit because there are no calibrated measurement means to help line the workpiece up with the router bit. 
         [0011]    (E) U.S. Pat. No. 5,533,556 patented Jul. 9, 1996—Class 144/Sub-Class 144.52 to David Whitney for a router guide apparatus. While this apparatus is portable, you must clamp the guide on each workpiece that needs a dado cut into it. This means that the apparatus must be clamped on each workpiece multiple times and great care must be given to the placement of the guide on each workpiece so that the matching dados will line up properly. This is quite time consuming and would be very hard to use in a production type setting. 
         [0012]    While all of these dadoing jigs do have a limited ability for making straight dados or grooves, these jigs require a new setup for each dado that is required on a workpiece. Also with these jigs, it is quite difficult to be sure that the workpiece is positioned in the exact same place as the previous workpiece. If the workpiece is not set up the same as the previous workpiece this could result in the dados not lining up properly when the workpieces are assembled. This shows that there is a need for a system that can make one or more repeatable dados on a workpiece and that does not take much time or effort to set up. 
       BRIEF SUMMERY OF INVENTION 
       [0013]    In view of the disadvantages of the prior art of dadoing jigs, the present dadoing system provides a means to make multiple dados in a transverse direction on a workpiece. The general purpose of this invention, which will be described subsequently in greater detail, is a system that will hold a workpiece in place and allow the setup of one or more guides to produce fast and reliable dados. This system allows the operator to dado one workpiece at a time or two workpieces can be dadoed at the same time, which insures that the dados on each workpiece will line up properly. 
         [0014]    To attain this the present system uses rigid sliding guide rails that can be secured in place on a rigid track system that has calibrated measurement means. The workpiece is held in place with the sliding channel clamp and by the sliding guide rails. The sliding channel clamp keeps the workpiece from moving in a transverse direction while the sliding guide rails apply a downward pressure on the workpiece. To insure the repeatability of each dado, there are sliding guide rail stops that are placed at each end on the backside of each sliding guide rail. Once all of the dados have been cut into the workpiece, the workpiece can be removed by simply loosening one end of each sliding guide rail and sliding the workpiece out of the dadoing system. 
       BRIEF SUMMARY OF THE INVENTION—OBJECTS AND ADVANTAGES 
       [0015]    The objects and advantages of the present invention are:
       (a) to provide a dado system that can be set up to make multiple dados on a workpiece.   (b) to provide a dado system that is easy to set up and use.   (c) to provide a dado system that is accurate.   (d) to provide a dado system that is cost efficient to manufacture.   (e) to provide a dado system that has a wide target market.   (f) to provide a dado system that can be used in a production type environment.   (g) to provide a dado system the home craftsman can use easily and efficiently.   (h) to provide a dado system that has a calibrated measurement means which can be used to easily and accurately align the sliding guide rails.   (i) to provide a dado system that has sliding guide rail stops, which allows for easy repeat dados.   (j) to provide a dado system that can produce thru dados as well as stop dados.   (k) to provide a dado system that holds a workpiece in place with a sliding channel clamp and downward pressure from the sliding guide rails.       
 
         [0027]    Further objects and advantages are to provide a dado system that can accommodate two workpieces so that both workpieces can have the dados cut at the same time, thus saving setup time while insuring that the dados for both workpieces will line up properly. Still further objects and advantages are there is no special training necessary to get accurate results from the dado system. 
         [0028]    The objects and advantages of this invention along with various features of novelty, which characterize the invention and helped form part of this disclosure, will be further pointed out in the claims portion of the specifications. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be made to the accompanying drawings and descriptive matter, which will be illustrated further in the preferred embodiment of the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         [0029]    In the drawings, closely related figures have the same number but different alphabetic suffixes. 
           [0030]      FIG. 1  is a perspective view of the complete dadoing system. 
           [0031]      FIG. 2  is a perspective view of the base of the dadoing system  11 . 
           [0032]      FIG. 3  is a front view of the front edge  11   c  of the base. 
           [0033]      FIG. 4  is a perspective view of the base shown as the squaring rails  13   a  thru  13   c  of the system have been installed. 
           [0034]      FIG. 5  shows the front view of the front edge of the base  11   c  after squaring rail  13   c  has been installed on the upper surface of the base  11   a.    
           [0035]      FIG. 6  shows a perspective view of the base depicting the placement of the tracks  3   a  thru  3   d  for the dadoing system. 
           [0036]      FIG. 7  shows the front view of the front edge  11   c  with squaring rail  13   c  installed on the upper surface of the base  11   a.    
           [0037]      FIG. 8  shows a perspective view of the base, depicting placement of the risers  14   a  thru  14   h.    
           [0038]      FIG. 9  shows a perspective view of the base of the system after the risers  14   a  thru  14   h  and tracks  3   a  thru  3   d  have been installed. 
           [0039]      FIG. 10  shows a cross section of the base in a perspective view at the same stage of construction as  FIG. 9 . 
           [0040]      FIG. 11  shows a perspective view of a small section of sliding channel clamp  5  that helps hold the workpiece  10  in place. 
           [0041]      FIG. 12  shows an end view of the sliding channel clamp  5 . 
           [0042]      FIG. 13  shows the end view of the sliding channel clamp  5 , which shows how the sliding channel clamp  5  is secured in place on the base of the dadoing system. 
           [0043]      FIG. 14  shows in perspective view a small piece of track  4   b  that has calibrated measurements means that help align the sliding guide rails when setting up the dadoing system. 
           [0044]      FIG. 15  shows the end view of the same small piece of track  4   b  in  FIG. 14 . 
           [0045]      FIG. 16  shows a perspective view of the single track  3   e  that allows the sliding fliparm router stop to slide in a transverse direction, which allows the operator to make stop dados on the workpiece  10 . 
           [0046]      FIG. 17  shows the end view of track  3   e  in  FIG. 16 . 
           [0047]      FIG. 18  shows a perspective view of a sliding guide rail stop  19   g.    
           [0048]      FIG. 19  shows the end view of the open end of the dadoing system. 
           [0049]      FIG. 20  thru  27  shows a perspective view of the guide rail stops for the dadoing system. 
           [0050]      FIG. 28  shows a exploded view of the right end of the dadoing system. 
           [0051]      FIG. 29  shows the end view of the right end of the system as the sliding guide rail  2   d  is being put into place. 
           [0052]      FIG. 30  shows a perspective view of the fliparm router stop  66  assembly. 
           [0053]      FIG. 31  shows a perspective view of the base plate  7  for the fliparm router stop. 
           [0054]      FIG. 32  shows a topside view of the fliparm router stop base plate  7 . 
           [0055]      FIG. 33  shows exploded view of fixed rotating mounting cylinder sleeves  8   a  and  8   b , the rotating mounting cylinder  9  and the base plate  7  for the fliparm router stop  66 . 
           [0056]      FIG. 34  shows exploded view of where the fliparm  6  is attached on the rotating mounting cylinder  9 . 
           [0057]      FIG. 35  shows exploded view of fliparm router stop  66  ready for complete assembly. 
           [0058]      FIG. 36  shows perspective view of assembled fliparm router stop  66 . 
           [0059]      FIG. 37  shows front view of cross section of  FIG. 10 . 
           [0060]      FIG. 38  shows top view of the sliding channel clamp  5 . 
           [0061]      FIG. 39  shows cross section of base  11  showing how the sliding channel clamp  5  can be adjusted and secured to the base of the dadoing system. 
           [0062]      FIG. 40  shows end view of sliding channel clamp  5 . 
           [0063]      FIG. 41  shows perspective view of track  3   e  and the sliding guide rail  2   b  that the sliding fliparm router stop  66  is slidably engaged to. 
           [0064]      FIG. 42  thru  45  shows side view of the sliding guide rails with the male-threaded fasteners  15   a  thru  15   h  and the female threaded receivers  1   a  thru  1   h  ready to be engaged to tracks  4   a  and  4   b.    
           [0065]      FIG. 46  shows top view of dadoing system set up for a left hand stop dado. 
           [0066]      FIG. 47  shows top view of dadoing system set up for a right hand stop dado. 
           [0067]      FIG. 48  shows top view of dadoing system set up for a thru dado. 
           [0068]      FIG. 49  shows open-end view of dadoing system with workpiece  10  secured into place. 
           [0069]      FIG. 50  shows cross section of dado system showing the starting point of the router when cutting a thru dado. 
           [0070]      FIG. 51  shows cross section of the dado system depicting where the router will be after the dado has been cut. 
           [0071]      FIG. 52  shows the top view of the workpiece showing how the router bit pulls the router against the sliding guide rail  2   c  of the dadoing system. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0072]    As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. Referring to the drawings in detail, closely related figures have the same number but different alphabetic suffixes. 
         [0073]      FIG. 1  shows the dadoing system in a perspective view, set up with a workpiece in place ready to be dadoed. The dadoing system comprises: a base (which includes four edges and a upper surface and a lower surface) hereafter will be referred to as reference number  11 ; consists of upper surface  11   a , right edge  11   b , front edge  11   c  and left edge  11   d ; (the back edge and lower surface of the system are not shown); a plurality of tracks having a calibrated measurement means; a plurality of sliding channel clamp tracks; a plurality of sliding guide rails; at least one sliding channel clamp; at least one fliparm router stop; a plurality of squaring rails; a plurality of risers and at least one fliparm router stop track. The base  11  comprises a planar, rigid, and substantially rectangular surface, which is oriented substantially horizontally in operation. 
         [0074]    The preferred measurements of the base of the dadoing system are approximately 48″ long and 40″ wide. The upper surface of the base  11   a  receives dados for tracks  3   a  thru  3   d  that are constructed preferably from a rigid metal material, that can accept a male-threaded fastener, preferably a t-bolt, which will allow the sliding channel clamp  5  to slide in a transverse direction. This transverse movement will allow workpieces of different widths to be secured in place on the dadoing system. The dados  12   a  thru  12   d  on the upper surface of the base  11   a  should be spaced so that the sliding channel clamp  5  will be properly supported in its longitudinal direction on the upper surface  11   a  of the base. The dados  12   a  thru  12   d  are cut into the upper surface of the base  11   a . The dados have a predetermined width and depth that receives and stabilizes the sliding channel clamp tracks  3   a  thru  3   d . The base  11  should look similar to  FIG. 2  and  FIG. 3 . 
         [0075]    The squaring rails will be fastened on the upper surface of the base  11   a . The squaring rails keep the workpiece square on the dadoing system. The squaring rails  13   a  thru  13   c  are preferably constructed from a substantially straight, flat, rigid material. Squaring rail  13   a  is wide enough to accommodate sliding guide rail track  4   a . When fastened to the upper surface of the base  11   a , one end of the squaring rail  13   b  should align with the front edge of the base  11   c  and one side of the squaring rail  13   b  should align with the right edge of the base  11   b . Squaring rail  13   b  is preferably the same width as squaring rail  13   a . One end of the squaring rail  13   a  should be in contact with one long edge of squaring rail  13   b  and the other end should align with left edge of the base  11   d . One long side of squaring rail  13   a  should align with the back edge of the base  11  (back edge of base not shown). One end of the squaring rail  13   c  should also be in contact with one long edge of squaring rail  13   b  and the other end should align with the left edge of the base  1   d . The width of squaring rail  13   c  is wide enough to accommodate sliding guide rail track  4   b  and to have enough space to allow router bit  30  to start turning before the bit makes contact with the workpiece  10 . The base of the dadoing system should look similar to  FIG. 4 . 
         [0076]    Tracks  3   a  thru  3   d  are fastened on the upper surface of the base  11   a . Tracks  3   a  thru  3   d  fit between squaring rails  13   a  and  13   c  and are fastened in each dado  12   a  thru  12   d  that were previously cut into the upper surface of the base  11   a . This insures that the tracks  3   a  thru  3   d  are square with the squaring rails and the rest of the base  11  and also stabilizes the tracks  3   a  thru  3   d . In  FIG. 6  the details of the drawing show the tracks  3   a  thru  3   d  are ready to be fastened to the upper surface of the base  11   a . The tracks  3   a  thru  3   d  will allow for the transverse movement of the sliding channel clamp  5 . 
         [0077]    The riser&#39;s  14   a  thru  14   h  can be fastened to the top of the base  11   a  on each side of the tracks  3   a  thru  3   d . The risers are preferably constructed from substantially flat, elongated, rigid material. The risers fit between squaring rails  13   a  and  13   c . The risers are preferably ¼″ higher than tracks  3   a  thru  3   d . The purpose of the risers are to raise the workpiece  10  and the sliding channel clamp  5  above the tracks, allowing the workpiece  10  to be taken in and out of the system and allowing the sliding channel clamp  5  to move in a transverse direction without coming into contact with the tracks  3   a  thru  3   d  or any debris or wood chips from the dadoing process. 
         [0078]    The tracks  4   a  and  4   b  preferably constructed of rigid metal material that can accommodate male-threaded fasteners, preferably t-bolts, and having the calibrated measurement means are now fastened to the dadoing system. The tracks  4   a  and  4   b  are approximately the length of the base  11 . The first track  4   b  should be installed on squaring rail  13   c . Each end of the track  4   b  aligns with each edge of the system  11   b  and  11   d . The side of the track  4   b  aligns with the front edge of the base  11   c . The second track  4   a  should be fastened to the system in the same manner as the first track  4   b.    
         [0079]    Sliding channel clamp  5  is preferably constructed from a rigid substantially straight material having a predetermined width, length and thickness. The sliding channel clamp has male-threaded fasteners, preferably t-bolts  20   a  thru  20   d , which are slidably engaged with tracks  3   a  thru  3   d . Each male-threaded fastener extends from one of the tracks  3   a  thru  3   d  and is received by holes that are countersunk into the sliding channel clamp  5  that are aligned with tracks  3   a  thru  3   d . The male-threaded fasteners have female-threaded receivers, preferably nuts  22   a  thru  22   d , which are accompanied by a means, preferably lock washers  21   a  thru  21   d , to hold the female-threaded receivers in place when the female-threaded receivers are receiving and securing the male-threaded fasteners that secure the sliding channel clamp  5  down in place during use. The reason for the countersunk holes are that the top area of the sliding channel clamp  5  must be clear of any obstructions because the sliding guide rails  2   a  thru  2   d  slide over the top of the sliding channel clamp  5 . Sliding channel clamp  5  also has a channel cut into it that allows the router bit  30  to exit the workpiece  10  without cutting into the sliding channel clamp  5 . In  FIG. 38 ,  FIG. 39 ,  FIG. 40 , and  FIG. 51  it can be seen how these parts are used to make the sliding channel clamp  5  adjustable for accepting different widths of workpieces that may be used in the dadoing system. 
         [0080]    The sliding guide rails  2   a  thru  2   d  are preferably constructed from substantially square, straight, rigid metal material; being sildably engaged with tracks  4   a  and  4   b , while spanning the area that can receive the workpiece  10 . Each end of the sliding guide rails overhang tracks  4   a  and  4   b  as shown on  FIG. 46 . A hole is drilled on each end of each sliding guide rail  2   a  thru  2   d  so that a male-threaded fastener, preferably t-bolts  15   a  thru  15   h , can extend thru each end of each sliding guide rails  2   a  thru  2   d  and each male-threaded fastener being engaged with one of the tracks  4   a  or  4   b , which can be seen in  FIG. 28  and  FIG. 29 . This will allow longitudinal movement for each sliding guide rail, which will allow set up anywhere along the length of the workpiece  10 . Female-threaded receivers, preferably knobs, are shown in  FIG. 1 . The knobs  1   a  thru  1   h  are preferably made from rigid material that will accept a male-threaded fastener, preferably a t-bolt, used to lock down each end of each sliding guide rail  2   a  thru  2   d . Female-threaded receivers or knobs  1   a  thru  1   h  should be small enough that they do not extend past the sides of the sliding guide rails  2   a  thru  2   d , thus leaving a clear path for the router  31 . Sliding guide rail stops  19   a  thru  19   f  are used to be a positive stop for the sliding guide rails  2   a  thru  2   d.    
         [0081]    The sliding guide rail stops  19   a  thru  19   h  are preferably constructed from rigid elongated metal material, having a substantially straight, flat, horizontal surface and a substantially straight, flat, vertical surface. A hole is drilled into each sliding guide rail stop so that each male-threaded fastener, preferably t-bolts,  16   a  thru  16   h , being slidably engaged with one of the tracks  4   a  or  4   b , can extend thru each sliding guide rail stop as can be seen in  FIG. 19 . T-bolts  16   a  thru  16   h  have female-threaded receivers, preferably nuts  18   a  thru  18   h . The female-threaded receivers have a means to hold the female-threaded receivers in place, preferably lock washers,  17   a  thru  17   h , thus allowing the sliding guide rail stops to be secured in place during use. Preferably, sliding guide rail stops  19   a  thru  19   h  have rounded corners shown in  FIG. 20  thru  27 . 
         [0082]    Fliparm router stop track  3   e  is installed on one of the sliding guide rails. As shown in  FIG. 41 , track  3   e  is fastened to the top of sliding guide rail  2   b  with fastening means, preferably screws,  23   a  thru  23   i.    
         [0083]    The base plate  7  is preferably constructed of an elongated, substantially straight, flat, rigid metal material that has a predetermined length, width and thickness. The fixed rotating mounting cylinder sleeves  8   a  and  8   b  for the fliparm router stop  66  are preferably constructed from rigid metal material, being substantially straight, and having a substantially round hollow interior with a predetermined diameter and length. The length of the fixed rotating mounting sleeves  8   a  and  8   b  are long enough to accept a male-threaded fastener, preferably t-bolts  24   a  and  24   b , and a fastening means, preferably screws  25   a  and  25   b , to fasten the sleeves to the base plate  7 , while having space to receive the rotating mounting cylinder  9 . 
         [0084]    The rotating mounting cylinder  9  is preferably constructed of a rigid, substantially straight, round, solid metal material. The rotating mounting cylinder  9  has a notch that will receive the fliparm  6  and has the length to receive the fixed rotating mounting cylinder sleeves  8   a  and  8   b.    
         [0085]    The fliparm  6  is preferably constructed from a substantially flat, straight, rigid metal material. While the fliparm stop is still flat, one end of the stop is rounded as seen in  FIG. 34 . At the opposite end of the fliparm  6 , the first bend is approximately ⅞″ from the end with the square corners. The first bend on the fliparm is approximately 60 degrees. The second bend will be approximately 2¼″ from the first bend and will be approximately 62 degrees. The fliparm should look similar to  FIG. 34 . The fliparm  6  can be fastened to the rotating mounting cylinder with fastening means, preferably screws  26   a  and  26   b . The sleeves  8   a  and  8   b  should now slide over the rotating mounting cylinder  9 , stopping against the fliparm  6  as shown in  FIG. 35 . The parts of the fliparm router stop  66 , which include the rotating mounting cylinder  9 , fliparm  6  and fixed rotating mounting cylinder sleeves  8   a  and  8   b  can be fastened to the base plate  7  with fastening means, preferably screws  25   a  and  25   b . Holes that can accommodate a male-threaded fastener are drilled in each sleeve. Male-threaded fasteners, preferably t-bolts  24   a  and  24   b , can be put into place with female-threaded receivers, preferably nuts  27   a  and  27   b , which can be secured with securing means, preferably lock washers  28   a  and  28   b . Now the assembled parts can be slid into the fliparm router stop track  3   e  as seen in  FIG. 1  and  FIG. 30 . 
         [0086]    To operate the dadoing system, a workpiece must first be placed onto the upper surface of the system  11   a . In this example it will be shown how the dadoing system will be set up for dadoing a side of an upper cabinet with thru dados. The first step will be sliding the sliding channel clamp  5  to one side of the system, which will allow the workpiece to be slid into position. The top edge of the workpiece  10  should abut the side of squaring rail  13   b , while the right side of the workpiece  10  is abutting the squaring rail  13   c . Now the sliding channel clamp  5  can be pushed against the left edge of the workpiece  10 . The sliding channel clamp  5  should not be so tight against the workpiece  10  that the workpiece cannot be easily removed from the system. There should not be any play between the workpiece  10  and the sliding channel clamp  5 . Each male-threaded fastener, preferably t-bolts  20   a  thru  20   d , has a means for securing female-threaded receivers in place, preferably lock washers  21   a  thru  21   d  shown in  FIG. 39 . Each male-threaded fastener  20   a  thru  20   d  also has a female-threaded receiver, preferably nuts  22   a  thru  22   d  in  FIG. 39 . Each male-threaded fastener can now be tightened down with a ratchet. The setup for the sliding guide rails  4   a  and  4   b  is very simple. 
         [0087]    The tracks  4   a  and  4   b  both having calibrated measurement means, which will aid in lining the sliding guide rails  2   a  thru  2   d  up at the point where the dados are needed. The guide rails  2   a  thru  2   d  must be set so that the center of the router bit  30  will be in the center of the dado that needs to be cut. The sliding guide rails  2   a  thru  2   d  have female-threaded receivers shown as knobs  1   a  thru  1   h  that are tightened down as each sliding guide rail is set in place. 
         [0088]    As each sliding guide rail  2   a  thru  2   d  is tightened down, the sliding guide rail stops  19   a  thru  19   h  are placed on the backside of the sliding guide rails, with the vertical side of the sliding guide rail stops abutting the vertical back side of the sliding guide rails and then being tightened down as shown in  FIG. 48 . This is done so that when all of the dados are cut into the workpiece  10  and the workpiece is ready to be removed from the dadoing system; which is done by loosening the female-threaded receivers  1   e  thru  1   h  and sliding the workpiece  10  out, the stops allow the sliding guide rails to be secured in the same place as the previous workpiece. 
         [0089]    The sliding channel clamp  5  does not have to be loosened to remove or reinsert a new workpiece. When the new workpiece has been slid into place, sliding guide rail  2   d  can be pushed up against guide rail stop  19   a  and tightened down. The same procedure should be followed with sliding guide rail  2   c  and guide rail stop  19   c ; follow these procedures until all four sliding guide rails have been tightened down. The setup would look similar to  FIG. 48 . Looking at  FIG. 50 , which shows a cross section of what the set up would look like before the router  31  and router bit  30  starts its cut into the workpiece. Looking at  FIG. 51 , which is the same cross section showing where the router  31  and router bit  30  will be after the dado has been made. Looking at  FIG. 52  it can be seen how the rotation of the router bit  30  pulls the router into the sliding guide rail  2   c  leaving a straight clean dado  32 . Only the base plate  29  of the router is shown in  FIG. 52 . 
         [0090]    For cutting stop dados in workpiece  10  the fliparm router stop  66  is set up so that it can stop the forward progress of the router at the desired location as seen in  FIG. 46 . For cutting the opposite stop dado in the workpiece  10 , the fliparm router stop  66  will be set up as shown in  FIG. 47  and the router bit  30  will be plunged into the workpiece; then the router  31  will be moved forward until the router bit is clear of the workpiece as shown in  FIG. 51 . 
         [0091]    It is to be understood that while certain forms of the present invention have been illustrated and described herein, it is not to be limited to the specific forms or arrangement of parts described and shown. For example, knobs  1   a  thru  1   h  could be replaced with wing nuts or nuts with lock washers or lock washers could be used with the knobs  1   a  thru  1   h . Another alternative way would be to make the sliding guide rails  1   a  thru  1   d  from rigid metal with one substantially straight vertical side and one substantially straight horizontal side. Another alternative way would be to have one end of the base open and the other end, squaring rail  13   b , would be removable, this would allow for longer workpieces to be dadoed. Also if desired, the dados  12   a  thru  12   d  could be eliminated and tracks  3   a  thru  3   d  could be fastened directly to the upper portion of the base  11   a.