Apparatus for Grinding the Cutting Faces of Rotary Cutters.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Apparatus for Grinding the Cutting Faces of Rotary Cutters.
I, ULRICH EBERHARDT, of No. 97 New Jersey Railroad Avenue, in the City of
Newark, County of Essex, State of New Jersey, U.S.A. Engineer and Machinist, do
hereby declare the nature of the said invention for Improvements in Apparatus for
Grinding the Cutting Faces of Rotary Cutters to be as follows:
The apparatus described herein is designed for grinding the cutting faces of those
cutters which are notched upon the edge to form cutting teeth, and rotated when
used for shaping the teeth of gear wheels, or milling off the surfaces of other metallic
objects.
In such cutters, one side of the notch is commonly formed with cutting
faces which are nearly radial and which require to be ground near the periphery of
the cutter, and sometimes at opposite edges of the same.
Such cutters are commonly formed with a central hole by which they are fitted
upon the driving mandrel, and the present invention furnishes a means of supporting
such cutters upon a mandrel, and presenting their various cutting faces to the edge
or side of a grinding wheel.
It has been common to wet. the grinding wheel for dressing such cutters, to prevent
the overheating of the cutter; but the present invention furnishes a means of
supplying water jets to the cutter as well as to the grinding wheel at both ends of
the cut, so that the grinding wheel is cooled as it enters the notch of the wheel, and
the metal of the cutter itself is cooled where the grinder leaves the same, and where the
highest degree of heat is generated by the prolonged contact of the grinder with
the cutting face.
In the preferred form of the invention, two grinding wheels are mounted upon a
spindle adjacent to one another, to operate when required upon opposite edges of the
cutting face, and such wheels are enclosed within a casing having a hinged cover,
upon which a water pipe is adjustably mounted, and provided with two nozzles to
direct water jets upon the opposite sides of the cutter where it is intersected by the
grinding wheel.
The spindle is provided with a projecting flange within the casing, and the cover
is notched to fit over such flange, and provided with an annular groove to direct within
the casing the water which flies from the grinders into contact with the cover. The
casing is preferably mounted upon a hollow column adapted to contain a charge of
water; and a pump is actuated by the driving shaft of the machine to circulate the
water from the column to the nozzles.
.
An aperture is formed in the bottom of the casing to discharge the water
downward into the column, and a pan is fixed removably in the column and provided
with a grease separator, thus cleansing the water before it is refurnished to the
pump.
f
The machine is provided with a mandrel to support the cutter adjustably before the
grinders, the inandrel being fitted in a bearing which is attached to a rock-shaft, by
the oscillation of which the bearing with the mandrel and cutter is moved to and
from the grinder. An index or ratchet-wheel having the same number of

page_text: teeth as the cutter is also secured upon the mandrel, and a pawl is arranged to
operate upon such index wheel at each oscillation of the rock-shaft and mandrel
bearing, so as to rotate the cutter automatically to present the adjacent cutting face
to the grinder.
"
A detent is arranged to lock the index wheel at each actuation of the pawl. The
pawl is pivoted upon the mandrel bearing, and a stationary stop upon the frame of
the machine serves to actuate the pawl when the bearing is oscillated by the rock-
shaft. In some cases, the rock-shaft is furnished with a crank-arm, and the latter
vibrated automatically by ineans of a worm wheel which is rotated slowly by a worm
upon the driving shaft of the machine."
17.1
The machine is provided with a series of index wheels having teeth corresponding
in number to those of the cutters' which require to be ground, and when such index
wheel is secured upon the mandrel with a corresponding cutter, the worm wheel
serves, by the oscillation of the rock-shaft, to press the several cutting faces of the
cutter successively against the grinding wheel, and thus grind the entire cutter
without any attention from the operator.
".
..
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The bearing for the cutter mandrel is pivoted to a yoke upon the rock-shaft, so
that it may be tipped into various positions for accurately presenting the face of the
cutter to the grinder, and means is provided for effecting the operation of the
stationary stop upon the pawl in the various positions of the bearing.
Where the cutting face does not extend straight across the notch in the cutter, a
certain portion of the cutting face may be adjusted for presentation to one of the
grinding wheels, and all of such cutting faces upon the cutter thus be successively
sharpened upon such grinding wheel. By another adjustment of the mandrel
bearing, the remaining portion of each cutting face may be presented to the other
grinding wheel, and the cutter thus be completely ground upon all its cutting
faces.
**
J
°
Where two grinding wheels are required, they are secured upon the exterior of
a hub, one end of which is attached to the driving spindle, and the other end is
recessed, and the supporting bearing of the spindle is extended within such hub to
sustain the same intermediate to the grinding wheels. With the construction
described, the grinding wheels on 'the cutter are firmly supported in their required
positions, and the grinding of all the cutting faces upon the cutter is effected with
great rapidity and with very little care upon the part of the operator.
1 "
**F!
."
171
10 T
Apparatus for Grinding the Cutting Faces of Rotary Cutters.
111
I ULRICH EBERHARDT of 97 New Jersey Railroad Avenue, in Newark, County of 40
Essex, State of New Jersey, U.S.A. Engineer and Machinist, do hereby declare the
nature of 'this invention and in what manner" the same is to be performed, to be
particularly described 'and ascertained in 'and by the following statement
The object of this invention is to furnish an convenient and effective means of
accurately grinding the cutting-faces of such rotary cutters as are used in gear-cutting 45
machines for forming the teeth of cog-wheels ng du •nte sou
The invention is also applicable to the grinding of milling-cutters of various kinds,
and relates partly to means for intermittently rotating the cutter after pressing one
of its faces to the grinding-wheel to bring the succeeding face in contact with such
wheel, and partly to means for lubricating and cooling the cutter during the grinding 50
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74.1
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14127

page_text: орелая
cooning and rubricating the cutter means is provided for discharging
opposite jets of water or other lubricant toward the cutter upon both edges of the
surface which is being ground, so that the cutter is not only moistened and cooled
upon the side toward which the grinding wheel revolves, but also upon the opposite
side, which assists in cleaning the chips and abraded particles from the grinding-
wheel, while it operates most efficiently in preventing the cutter from over-heating.
The cutter is mounted upon a rotary spindle which is swung to and from the grinding-
wheel by a yoke attached to a rock-shaft, and the rock-shaft may be oscillated by
hand or automatically to bring the cutter in contact iutermittently with the grinding
wheel. These means with various constructive features which are claimed herein,
are shown in the annexed drawings, in which ;
Fig. 1 is a front elevation of the machine.
Fig. 2 is a plan of the index wheel and devices for actuating the cutter, the view
being taken in section on line 2, 2, in Fig. 3.
Fig. 3 is a rear elevation of the yoke and the cutter-holding device carried
thereby.
Fig. 4 is a side elevation of the saine, taken on line 4, 4 in Fig. 3; and
Fig. 5 is a vertical section at the center line where hatched, taken on line 5, 5 in
Fig. 2.
In Fig. 1 the cutter-supporting spindle is shown adjusted in a nearly vertical
position, and Fig. 6 is an end view of the machine with the cutter-spindle thus
adjusted.
Fig. 7 is an enlarged view of the detent for the rock-shaft hand-lever.
Fig. 8 is a plan of the machine with the cover for the grinding-wheels closed.
Fig. 9 is a plan taken in section, where hatched, upon line 9, 9 in Fig. 6.
Fig. 10 is a vertical section, where hatched, on line 10, 10 in Fig. 1.
Fig. 11 is a plan of the settling-pan with the cover e2 removed.
Fig. 12 is a plan of the cap e² inverted.
Fig. 13 is a plan of the plate o¹ inverted and detached from the parts shown in
Fig. 2.
Fig. 14 is an edge view of the same, and Fig. 15 a side view of the same.
Fig. 16 shows the under side of the cover A³.
The mounting of the grinding-wheel and means for lubricating and cooling the
cutter will be first described.
A designates a casing within which the grinding-wheels B are revolved, the casing
being mounted upon the top of a hollow column C and forming a water-trough to
catch the water or other lubricant which is supplied to such wheel and flows thence
into the top of the column by aperture D, which is provided with drip-flanges to
direct the fluid into a straining-pan E.
Two grinding-wheels with beveled-edges are used, each wheel having one plane
surface to which the cutter-faces are applied, and the wheels are shown clamped upon
a spindle, with their plane faces adjacent, at a suitable distance apart to apply the
cutter to either face at pleasure.
The casing A is provided with a bearing A', which is projected partly within the
casing, and the grinder-spindle B¹ is extended through such bearing and supported at
its outer end by a bracket bearing A2, pulleys a and a¹ being provided between the
bearings to receive the driving-belt, which rotates the grinders at a high rate of speed.
A hub b, provided in one end with a recess b¹, is attached to the grinder-spindle; the
recess fitting over the inwardly-projecting end of the bearing A. The hub is provided
at its inner end with a collar 62, against which one of the grinding-wheels B is fitted,
and the other grinding wheel is fitted to the outer end of the hub. A sleeve 6 of
suitable length is fitted to the hub between the grinding-wheels, and a nut and
washer (applied to the outer end of the spindle) clamps the wheel securely upon
the hub. Upon the outer side, the casing is notched at A+ concentrically with the
spindle to afford space for removing the nut and washer 64 when it is required to
change the grinding-wheels.
A cover A³ is hinged to the rear edge of the casing and curved to enclose the tops

page_text: of the grinding-wheels. The outer side of the cover is formed with semicircular
projection as to fit the notch A, and such projection is provided with a rim extended
into the casing, with an annular flange a depending from its inner edge, to cover the
joint of the notch and recess, and thus prevent the water from splashing out of the
casing. The collar 62 of the grinding-wheels is provided with a peripheral flange 6º,
and the rear side of the cover is notched to fit over such flange and provided with an
annular groove a', which directs within the casing any water that is thrown outwardly
by such flange.
The cover A³ is provided with a water-pipe a², carrying two nozzles a³ and a³, which
are bent to discharge jets of water toward one another, as illustrated in Fig. 6. A
stud d is mounted upon the top of the cover, and a pipe d' is swiveled upon the same
at right angles by means of sockets d², which are clamped, respectively, to the stud,
and to the pipe. The end of the pipe d¹ is formed with a vertical socket d³ in which
the pipe a² is swiveled, and provided with a handle d* to turn the latter pipe, for
adjusting the nozzles a³ and at in the proper relation to the cutter and grinding-
wheels when the cover is closed, as shown in Fig. 10.
In the drawings, the pipe a² is shown extended downward between. the grinding-
wheels B through a notch in the front of the cover A³, which brings the pipe between
the two wheels, so as to direct the jets against the same side of the wheel, whichever
one may be in use. If one wheel were used, the pipe a² would necessarily be
extended past one side of the same, and jets would in like manner operate upon the
same side of such wheel. This arrangement is employed because the cutting-face of
a rotary cutter is commonly a plane surface, which is ground by application to the
plane surface of the wheel, and it is such plane side against which the water-jets
are directed at opposite ends of the cutting-face where the grinder is operating.
A rotary pump G is mounted at one side of the column, and its spindle g, driven
by a belt g', applied to pulleys g², upon the grinder-spindle and the pump-spindle.
The inlet or suction of the pump, which may be constructed like an ordinary
blast-fan for blowing air, is screwed into one side of the column, so as to draw a
supply of water from the interior of the same, which is filled with water to the
level indicated by dotted line w in Figs. 1 and. 10. The outlet of the pump is
connected by a hose G with the pipe d', which is provided with a cock G² to
regulate the flow of water from the nozzles a³ and a*.
The pan E is made as a drawer supported upon cleats F within the column, and
as grease is liable to clog the grinding-wheels, the pan is provided with means for
separating from the water any grease which drips from the revolving journals within
the casing.
The grease separator is applied to an outlet above the bottom of the pan, which
outlet determines the level of the fluid in the pan, and the separator consists of a
flange projected downward adjacent to the mouth of such outlet and below the edge
of such mouth, so as to penetrate the surface of the water and thus intercept the
grease from flowing into the outlet. The fluid discharged from the outlet of the pan
falls within the column to supply the suction of the pump.
The pan is shown with a central outlet-passage in the bottom having a nozzle e
projecting upwardly, and the separator-flange et formed upon the edges of a cap e³,
the cap and flange being sustained at a little distance from the nozzle by sinall
seats o to permit the passage of the fluid.
When such discharge-outlet is operative, the water rises only to the level indicated
by the dotted line w², (in Fig. 10) but provision is made, in case the space between
the nozzle and the flange e¹ become clogged, for discharging the water from the
inner end of the pan, to prevent its overflow at the outer end, where the handle E¹
is provided. To effect this object, a notch is cut in the back end of the pan, forming
an outlet-passage o", which restricts the highest water-level to the dotted line w².
Adjacent to the passage of a vertical flange 08 is fixed, which penetrates the water
when it reaches the level w² and prevents the grease from overflowing, while the
water escapes freely through the passage o' into the column below. Either of these
separator devices may be use separately for straining the oil from the water. The

page_text: means for sustaining the cutter inay be widely varied to cooperate with the devices
already described but the preferred is constructed as follows:
The yoke H for presenting the cutter to the grinding-wheels is secured adjustably
upon the rock-shaft I, which is mounted to turn in bearings [¹ upon the top of a
vertically-adjustable post J. The post is fitted to slide in a vertical socket J³ upon
the outer side of the casing or through A, and is provided with a screw J2 for
adjusting it vertically, and with a set-screw j for clamping it when thus adjusted. A
toothed disk or ratchet-wheel K is secured upon one of the bearings I by lug and
bolt k¹, and a hand-lever L is secured adjustably upon the rock-shaft by a split hub l,
having clamp-screw . A pawl 12 is pivoted upon the hand-lever and actuated by a
handle near the outer end of the lever.
The ratchet-wheel K, being held rigidly, serves to support the hand-lever (by
means of the pawl (2) in any required position, and thus when required serves to
hold the yoke H in a convenient position for applying the cutter M to the cutter-
spindle M, which is mounted in a bearing m within the yoke H. Such bearing, as
shown in Fig. 3, is clamped within the arins of the yoke by a transverse hub M² and
bolts m', and may be adjusted at various angles to present the edge of the cutter in
various relations to the grinding-wheel.
In Fig. 6 the bearing is shown adjusted to hold the cutter-spindle nearly vertical,
so that the periphery of the cutter may be directly applied to the wheel B, and the
bearing is shown similarly arranged in Figs. 1, 3 and 4.
In Fig. 10 the bearing is shown tipped nearly forty-five degrees from the vertical,
to present a lateral edge of the cutter to the grinding-wheel. The yoke is
adjustable upon the rock-shaft I to and from the bearing I¹, so that when one
lateral face of, the cutter-teeth has been ground upon one of the wheels B, the
cutter may be turned over upon its opposite side toward the grinding-wheels and
the opposite lateral face ground upon the other wheel.
It should be noticed that Fig. 3 shows the opposite side of the yoke and bearing
from that shown in Figs. 1, and Fig. 4 shows the opposite end of the hub M² from
that shown in Fig. 10. Fig. 2 is projected from Fig. 3, the nearer side of the figure
representing the rear or hidden side of the same parts, where shown in Fig. 1.
Figs. 4 and 5 are viewed from the right hand side of the yoke where shown in
Fig. 1. The upper end of the spindle M' is provided with a detachable notched
index n, as shown in Figs. 2 to 5 inclusive, and a pawl and detent are provided for
respectively shifting and locking such index. A supporting-plate of to carry the
detent and pawl, is fitted movably upon the upper end of the bearing m and is
provided with screws to clamp it when adjusted. An arm n¹ is pivoted upon the
plate in the plane of the index by bolt o³, and the detent n², lying over the said arm,
is pivoted upon the same bolt and is pressed normally toward the index-wheel by a
spring p. A pawl p2 is pivoted to the free end of the arm and operates (when the
arm is moved from the position shown in dotted lines in Fig. 2) to turn the index-
wheel one notch and shift the cutter to grind the succeeding-face.
A spring p is attached to the plate of to press the arm n¹ forcibly toward the
index, and ineans is provided for automatically shifting the arm to the position
shown in dotted lines in Fig. 2 and thereafter permitting the spring p¹ to turn the
index and shift the cutter as desired. Such means consists of a crank-arm 7, pivoted
loosely upon the hub M2 and connected by a link with a swivel-eye 2 upon the end
of the arm n¹. The crank-arm r is locked by bolts s to a slotted segment s¹, which
has a lug s2 extended upward past and around the rock-shaft I in proximity to a
stop-bar 12, fastened to the bearing I¹.
The curved slot 82 in the segment s' permits the crank-arm r to be locked thereto
in different positions, as may be required, by the inclined adjustment of the
bearing m¹ and spindle M¹. The segment & is viewed from opposite sides in Figs. 4
and 10, and the different relation of the crank-arm r to the lug s² is clearly shown in
these two figures. The pressure of the springs p and pl operates, after moving the
pawl into the position shown in full lines in Fig. 2, to hold the detent n² pressed in
the index, to keep the same from turning until the rock-shaft is again oscillated and

page_text: the cutter retracted froin the grinder. The rotation of the rock-shaft to draw the
cutter from the grinding-wheel, as shown in Fig. 6, presses the lug s² into contact
with the stationary stop 12 and crowds the lug toward the rock-shaft, as shown in the
same figure, thus retracting the pawl to the adjacent notch upon the index-wheel n
and lifting the detent n² from engagement with the index-wheel by means of a pin t,
which is fixed in the arın n¹ adjacent to the end of the detent.
When the yoke is swung to move the cutter again toward the grinding-wheel, the
first part of the movement releases the lug 82 from contact with the stop I² and
permits the spring pl to actuate the pawl and turn the index as desired. During
the turning of the index-wheel the detent is pressed upon the outer periphery
of the index by its spring p and drops into the succeeding notch when opposite
the same.
The hub of the plate ot, which carries the arm n¹ and supports the pawl p², is fitted
to rotate upon the upper end of the bearing m, as shown in Fig. 5, and may be
adjusted in a small degree by set-screws u, (see Figs. 5, 14 and 15) which are
extended through an ear v upon the plate into contact with a seat v¹ upon the middle
of the bearing, as shown in Fig. 5. By slackening one of the screws and tightening
the other, the plate may be rotated slightly, thus operating through the detent and
pawl to turn the index-wheel a little, when it is necessary to produce a slight
adjustment of the faces of the cutter toward or away from the grinding-wheel. A
collar T is fixed upon the rear end of the rock-shaft and formed with a lateral lug
carrying a set-screw T¹ to contact with the bracket below the bearing I¹, so as to
arrest the downward movement of the hand-lever and the motion of the cutter
toward the grinding-wheel, which enables the operator to adjust the penetration of
the grinder into the cutter in precisely the desired degree. The oscillatory movement
of the rock-shaft, which is required to actuate the pawl and the index-wheel, may be
performed by the hand-lever L after suitably grinding one of the cutting-
faces, thus automatically shifting the cutter so as to grind all of its faces in
succession, or the same oscillation of the rock-shaft may be automatically effected
if desired, and provision is shown in Figs. 1 and 6 for thus oscillating the shaft
and grinding all the cutting-faces upon the cutter without attention from the
workman.
Such means consists of a worm-wheel N, rotated by worm N¹ upon a shaft N²,
which is driven by a belt P and pulleys upon the pump-spindle and worm-shaft,
respectively.
A slotted crank-arm R is secured adjustably upon the rock-shaft by a set-screw R
and is connected by a link $ with a crank-pin S upon the face of the worm-wheel.
When the set-screw R' is tightened, the rock-shaft is controlled by the movements
of the worm-wheel, and is oscillated to shift the cutter to and from the grinding-
wheel and to rotate it intermittently, as described above. The set-screw T is
slackened, so as to be out of use; when the slotted arm R is secured to the rock-
shaft. When the set-screw R' is loosened, the crank-arm R has no effect upon the
shaft, which may then be actuated by the hand-lever L to adjust the cutter in a
suitable position and to turn the lower end of the cutter-spindle outward for removing
the cutter when the grinding is completed. The index-wheel n is also removable
and is secured, like the cutter, by a nut t¹, so that an index-wheel may be used with
notches corresponding to the number of cutting faces upon the cutter.
The worm and worin-wheel N and N are represented as driven from the pump-
spindle g, but as such spindle is connected with the grinder-spindle by the belt gl
the worm is actuated indirectly by the cutter-spindle and may be driven directly
therefrom with the same result. It will also be noticed that the pawl p2, which
intermittingly turns the index, is actuated by the stop 12 upon the frame of the
machine and intermediate means which shift the pawl when the rock-shaft is suitably
oscillated. Other means may therefore be used instead of the lug 82 and stop I² for
actuating the pawl p² without departing from the spirit of the invention. In the
operation of the machine the pipe a' is adjusted vertically to bring the nozzles a³
and a upon opposite sides of the cutter, as shown in Figs. 9 and 10, the jets then

page_text: throwing a flood of water upon both ends of the cut and also upon the grinding-wheel
before and after its contact with the cutter. The wheel is thus cleaned in the most
efficient manner, while the cutter is prevented from overheating by the jet which
projects water upon it immediately after the cut, which draws out the heat conjointly
with the opposed jet of water. The column operates as a reservoir to retain a supply
of water, while the pump circulates the water from the column to the nozzles.
The pan operates as a settling-chamber, to remove the sediment from the water
before it enters the column, and can be readily withdrawn and emptied; while the
column itself is furnished with a removable cap C opposite to the suction-pipe c,
which permits the removal of sediment from the column when required. It is
common in cutter-grinding machines to apply a jet of water to the grinder just prior
to its point of contact with the cutter, but the operation of the grinder upon the
cutter tends to generate a good deal of heat in the cutter, which is not in any way.
relieved by the water-jet, when applied to the cutter prior to the cut.
In the present invention an auxiliary jet of water is applied to the cutter itself
upon the side where the grinder emerges from the cut, and where the water will.
remove the heat which has been generated during the cut.
and
In Fig. 6 the jets of water from the nozzles a³ and a are shown connected together
and the water splashed laterally by the contact of such jets, because the cover A³, with
the water-pipe a², is turned backward into contact with a support or rest A5; but
when the cover is turned down into its operative position, as indicated in Fig. 10,
the nozzles discharge their water upon the cutter at the upper and lower sides of the
cut, and thus operate as desired. By rotating the pipe a² in the socket d³ the nozzles
may be adjusted, as shown in Fig. 8, in any desired relation to the cutter or either of
the grinding-wheels B, and when the nozzles are directed towards the
upper
lower sides of the cutter the splash of the jets operates as effectively to moisten the
grinding-wheel as if the edge were directed exclusively upon such wheel. It has
also been common to immerse the grinder or cutter in water during the grinding of
the cutter; but with such an arrangement the splash of the liquid wholly prevents
any inspection of the cutter during the grinding operation, and the centrifugal
force generated by the grinder tends to. drive the liquid away from the cutter, and
thus permits the heating of the cutter in an undesirable manner. By the application
of jets of water to the grinder at opposite sides or ends of the cut all these objections
are obviated and the cutter is cooled in the most effective manner.
"It is obvious that all of the improvements may be used in a tool-grinder where
turning-tools, planing-tools, or cutters are held in the hand for application to the
grinding-wheel, and the term "cutter" herein may be used to include such various
forms of cutters.
L
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that
what I claim is :
7
1. In a cutter-grinder, the combination, with means for sustaining the cutter and a
grinding-wheel for making a cut upon the same, of water-jets applied at the opposite
ends of such cut, to cool the cutter at opposite ends of the cut, substantially as herein
set forth.
2. In a cutter-grinder, the combination, with the grinding-wheel and means for

page_text: cover inclosing the same, and means for pressing the cutter upon the grinding-wheel,
of a water-pipe sustained adjustably upon the cover and extended within the same, and
provided with nozzle adapted to project a jet upon the side of the wheel, as and for
the purpose set forth.
3. In a cutter-grinder, the combination, with means for holding the cutter to the
grinding-wheel, of a suitable casing having a bearing projected within the same and
a spindle extended from such bearing, with hub 6 having recess 61 to receive the
bearing, a flange 62 at the inner end of such hub, two grinding-wheels secured upon
the hub with intermediate sleeve 63, and nut upon the end of the spindle for clamp-
ing the parts together, the whole serving to sustain the hub intermediate to the
grinding-wheels, substantially as herein set forth.
6. In a cutter-grinder, the combination, with a column having a stationary casing
supported thereon with a grinder-wheel mounted therein, of a rock-shaft mounted
upon the casing adjacent to the grinder with means for oscillating the same at
pleasure, a yoke upon the rock-shaft with bearing and spindle to sustain the cutter,
and means for intermittently adjusting the cutter to present its cutting-faces
successively to the grinder, substantially as herein set forth.
7. In a cutter-grinder, the combination, with a casing and a grinder-wheel
mounted therein, of a rock-shaft mounted adjacent to the grinder with means for
oscillating the same at pleasure, a yoke upon the rock-shaft with bearing and spindle
to sustain the cutter, an index-wheel upon the cutter-spindle, a pawl to turn the
index-wheel and a stationary stop upon the machine with intermediate means adapted
to actuate the pawl when the rock-shaft is suitably oscillated, substantially as set
forth.
8. In a cutter-grinder, the combination, with a casing and a grinder-wheel mounted
therein, of a rock-shaft mounted adjacent to the grinder, a yoke upon the rock-shaft
with bearing and spindle to sustain the cutter, a hand-lever for oscillating the rock-
shaft, and a pawl and ratchet for holding the same in its adjusted position, substantially
as herein set forth.
9. In a cutter-grinder, the combination, with a casing and a grinder-wheel mounted
therein, of a rock-shaft mounted adjacent to the grinder, a yoke upon the rock-shaft
with bearing and spindle to sustain the cutter, a crank-arm secured to the rock-shaft,
and means actuated by connection with the grinder-spindle, for vibrating such
crank-arın and oscillating the rock-shaft, automatically, as and for the purpose set
forth.
10. In a cutter-grinder, the combination, with a casing and a grinder-wheel
mounted therein, of a rock-shaft mounted adjacent to the grinder, with means for
oscillating the same at pleasure, a yoke upon the rock-shaft with bearing and spindle
to sustain the cutter, an index-wheel upon the cutter spindle, the hub o fitted to turn
upon the bearing and provided with screws u for fine adjustment, and with the
plate of provided with the detent n² fitted to the index, as and for the purpose set
forth.
11. In a cutter-grinder, the combination, with a grinding-wheel, of the casing A
with bearing A¹ at the upper edge, upon the side, having spindle projected into the
casing to carry the grinding-wheel, the spindle being provided with hub having the
peripheral flange be, and a cover A³ being hinged to the casing and notched to fit
over such flange, and provided with an annular groove a to direct the water within
the casing, substantially as herein set forth.
12. In a cutter or tool-grinder, the combination, with a casing inclosing a grinding-
wheel, and supported upon a column (as C), of a spindle supporting the
grinding-wheel within the casing, one or more nozzles to direct water upon the
grinding-wheel and tool or cutter, an aperture through the bottom of the casing, a pan
fixed removably in the column and provided with a grease separator, as set forth,
and discharging the water into the bottom of the column, and a pump to circulate
the water from the column to the nozzle, as and for the purpose set forth.
13. A grease separator for the cutter or tool-grinder described, comprising a pan
fitted removably below the grinding-wheel to receive the water discharged therefrom,

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pan being provided with a grease separator having the discharge outlet above
the bottom of the pan, and a flange projected downward below the edge of such
outlet to prevent the escape of the grease therefrom with the water, substantially as
herein set forth.