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Dec. 31, 1946.
0, w, DAWSON
Filed Oct. 24. 1942
4 Sheets-Sheet: 2 _
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Dec. 31', 1946.
o. w. DAWSON
Fil~ed Oct. 24. 1942
4 Sheets-Sheet s
Dec. 1-31, 1946.
o, w, DAWSON
Filed Oct. 24. 1942
4 Sheets-Sheet 4 I
Patented Dec. 31,1946
I 2,413,436
Orlie W. Dawson, Ferndale. Mich.
Application October 24, 1942, Serial No. 463,157
21 Claims. (Cl. 51—-94)
This invention relates to grinding machines,
and particularly to a universal type of grinding
‘ in construction, positive in operation, and eco
nomlcal of manufacture.
Other objects and features of novelty of the in
machine which is capable of grinding ?at as well
vention will be either speci?cally pointed out or
as round workpieces and of sharpening and re
lieving cutting edges of tools.
5 will become apparent when referring, for a'better
understanding of my invention, to the following
' The invention pertains to an oscillatable head
description taken in conjunction with the ac
for the tool which supports a tool in position to
companying drawings, wherein:
be operated upon by a grinding wheel. The wheel
Figure 1 is a broken perspective view of a ma
may be disposed on the axis of the head to grind
?utes or‘splines in the tool body parallel to the 10 chine embodying features of this invention;
Fig. 2 is a view in elevation of the index and
axis or at an angle thereto when the tool sup
cam plates employed on the machine illustrated in
porting head is tilted on its base. Relief may be
provided to a tool by oscillating the head and
Fig. 3 is a broken sectional view of the tiltable
tool when a handwheel is rotated to rotate a
cam having cam surfaces which oscillate the head 15 base of the work supporting head ‘illustrated on
in accordance with the number of cutting edges
and reliefs to be provided thereon.
the machine of Fig. 1;
Fig. 4 is an enlarged perspective view of the
head of the machine illustrated in Fig. 1;
Fig. 5 is a perspective view of the head villus
the head when oscillating the head with a cam
having lobes disposed parallel to the cam axis, 20 trated in Fig. 4, taken on the opposite side there
In view of the cramping’action which occurs to >
the invention embodies the use of a cam of trun
cated'conical shape with the cam lobes thereon
disposed at an angle substantially equal to‘the
angular offset of the trunnions to the axis of the
Accordingly, the main objects of the inven
tion are: to provide a grinding machine ‘which is
Fig. 6 is a broken plan view of a gauging ele
ment, employed for positioning the tool in the
head illustrated in the foregoing ?gures;
Fig. 7 is an enlarged sectional view of the os
cillating head of the machine illustrated in Fig. 1;
Fig. 8 is a brokenview in elevation of one
form of tool which may be dressed on the ma—
chine illustrated in the ?gures.
circular workpieces andto sharpen and relieve 39 Fig. 9 is a broken view of a structure similar
universal in operation; toprovide a grinding ma
chine which may be employed to ‘grind ?at or
cutting edges of cylindrical tools; to provide a
head on the machine which may be set of! at an
to that illustrated in Fig. 1, showing a further
form of the invention;
angle corresponding to the angle of the point to
Fig. 10 is a broken sectional view of an ad
Justable cam element, for producing the cam rings
produce relief to the point; to provide an oscillat— 35 employed with the machine illustrated in Fig. l;
ing head, the trunnions of which may be set oil
Fig. 11 is a view in elevation of a combination
be ground on the tool and oscillate the tool to
at an angle'to the axis and adjustable to have -
the workpiece properly presented to the grinding
wheel to produce forward and lateral movement
‘ center and dog employed to support and drive a
Fig. 12 is a plan view of the structure illustrated
to the tool from the single cam plate during each ‘o in Fig. 11;
oscillation to simultaneously grind radial and
Fig. 13 is a broken plan view of the machine
angular relief to the cutting edges; to provide a
illustrated in Fig. 1, showing a further use there
of; and
head-which may be tilted at an angle to the
grinding wheel to grind sloping lands in the body .
Fig. 14 is a sectional view of a work supporting
of the tool; to provide a motor supporting riser 45 head, illustrating a. further form which this in
vention may assume.
on a platen in both forward and rearward posi
tion to have the grinding wheels adjustable ver
The base ID of the machine may be mounted
tically as well as‘ angularly thereon and movable
on a bench, or upon a pedestal H, and is pro
forwardly and rearwardly with the platen; to
vided with ways upon which a main platen I2
form the cam lobes on the cam plate from a single 50 is reciprocated. An operating handle .l3 extends
master cam constructed from a circular plate hav
from the side of the base I0 and is connected
ing a peripheral slotv in which an arcuate sector
to the platen through a rack 8 and pinion 9.
is provided struck from a circle of smaller radius
The pinion 9 is mounted on a shaft I51, to which
than the plate; and in general, to provide a grind
the operating handle I3 is secured. The shaft ,
ing machine of the universal type, which is simple 55 I5‘! is axially movable in its bearings, and is urged
by a spring I58 to force the pinion 9 into aligned
relation with the rack 8. By this arrangement
the handle I3 and shaft I51 may be pulled out
wardly of the base III to disengage the pinion
9 from the rack, so that the handle may be
turned to a different position and the pinion
moved to again engage the rack. After the dis
engagement of the pinion, the table to which the rack a is attached may be shifted in the ways
on the base II) to position the workpiece relative 10
to the grinding wheel, after which the pinion and
one side thereof and a boss“ extending from the
same side below the roller. An arm 31 projects
from the base 39 in position to be aligned with
the boss 45 to which it is joined by a spring
41, the tension of which may be adjusted by a
thumb nut 46 which is threaded into the boss.
The roller 44 engages a cam- plate 46 which
produces the ‘oscillating movement to the head
38 against the tension of the spring 41 which
urges the head, and therefore the cam plate 46, 4
against the roller 44 at all times. To prevent
a cramping action from occurring between the
roller and the cam plate-46, the cam plate is
The base I6 supports a dove-tailed element I4,
constructed in the shape of a truncated conical
upon which a motor riser supporting platen I5
is mounted, having a forward and rearward sup 15 section to present a sloping face to the roller
44 which is set off to contact the face along a
porting position capable of producing various
line across the width of the cam plate.
types of grinding, as will be explained hereafter.
Referring more specifically to Fig. 'l, the head
A handwheel I8 operates a lead screw which has
36 embodies a housing 49 secured to or made
threaded relation with a nut (not shown) on
the platen I5 for positioning the platen at any 20 part of the base 39. A pair of ball bearings 5I
point on a line at right angles to the .direction ' and 52 are mounted within the housing 49 on
which a sleeve 53 is'mounted. An adjustment
of movement of the platen I2. The platen l2
ring 54 having slots 55 for receiving a Spanner
has a sub-base I9 secured thereto by bolts 2i
or other wrench, is threaded upon the sleeve 53
and a pair of bosses 22 extending upwardly from
the side edge of the sub-base. Studs 23 project 25 and tightened against the inner race 56 of the
ball bearing 52. This applies a pressure to a
through the bosses 22 and have their ends pro
jected into apertures in the side of a base 24 p sleeve 51 through the balls 56 and the outer race
of a ?xture which pivots on the studs when tilted . 59 of the bearing. The sleeve 51 applies pressure
\to the outer race 6| the balls 62 and the inner
upwardly, as illustrated in Fig. 3. A pair of
pivotal links 25 have studs 26 extending through ' 30 race 53 of the bearing 5|. 'The race 63 is abutted
against a shoulder 64 in the sleeve 53 and an
slots 21 therein and into the base 24, for the
inner sleeve 65 is disposed between the inner races
purpose of clamping the base 24 in horizontal or
rack are again engaged.
56 and 63 of the two bearings for regulating the
any angular position.
The base 24 of the ?xture has an annular recess
amount or pressure which may be applied to the
28 in which a circular plate29 is disposed for 35 balls. The‘bxalls 56 and 62 of, the two bearings
5I and 52 are in this manner preloaded a pre
adjustment about a central pin 30. Screws 3|
determined amount to provide stability and to
extend through arcuate slots 32 in the plate 29
prevent any side orend movement to the collet
into the base 24, for clamping the plate and base
66 and the workpiecesupported thereby.
together in adjusted relation. The plate 29 has
Washer-like end caps .51 are secured to the
a pair of trunnion bearings 33 extended upwardly 40
ends of the housing 49 by a plurality of screws 66
therefrom and containing “Oilite” bearings 3Ia
and are provided with ‘grooves in the inner pe
which are sealed at the ends with Welch plugs
ripheral surface in which dust-proof felt rings
3Ib. The bearings 3Ia. support a shaft 34 upon.
are disposed in contact with the outer surface of
which a sleeve '35 of an oscillatory head 36 is
secured by screws 40. The shaft oscillates in 45 the sleeve 53. The collet 56 is located and se
cured against annular movement by a locating
the bearings in the trunnions 33 and oscillates
screw ‘III, which has its inner end projecting in
an annular plate 36 therewith which is secured
a slot ‘II in the collet. The inner end of the
collet is hollow and contains an internal thread
workpiece has an annular base 39 of the same 50 I49 with which a thread I H or a hollow draw
bar 12 engages. A handwheel ‘I3 is secured to
diameter as the plate 36, on which it is supported
the outer end of the draw bar ‘I2 by a screw
for adjustment about a central pin 50. The plate
to the sleeve 35.
The oscillating head 38 for supporting the
‘I4. A split sleeve ‘I5 extends within the outer
and base are secured in adjusted position by
end of the hollow draw bar ‘I2, through which a
bolts 4| which extend through arcuate slots 42
in the plate 36 and thread into the plate 39. The 55 positioning rod ‘I6 extends. An annular shoul
plate 29 or the head 36 may be adjusted relative
der 11 on the draw bar 12 abuts against the outer
end of the sleeve 53 and is provided with a screw
to the base 24 and the base 39 of the head 36
may be adjusted on the plate 36, all for the
‘I6 which clamps the sleeve ‘I5 to the draw bar
purpose which will be explained hereinafter. In
‘I2 and the adjusting rod ‘I5. The rod ‘I6 and
dex marks I31 -may be provided between the 60 the split sleeve ‘I5 can be removed from the draw
base 39 and plate 36, while index marks I36 may
bar ‘I2 to permit the shank of a tool to extend
be provided between the plate 29 and the base
into or through the draw bar.
24, as illustrated in Fig. 5, for aid in the setting
The adjusting rod ‘I6 is employed as a stop
of the plates and bases relative to each other.
so that a plurality of like tools may be ground
A bracket 43 is mounted on a base element I39
to exactly the same length as is required in a
of arcuate shape, having T-shaped slots I4I dis
multiple tool set up.
posed on an arc struck about the center of the
When the sleeve 53. is held against rotation by
pin 30 of the base 29. A ?ange I42 on the bracket
the index plate and pin, referred to hereinafter,
the workpiece 59 is tightly clamped within the
43 has a pair of bolts I44, the heads of which
project within the T-slots MI and which clamp
collet 66 when the handwheel ‘I3 is rotated. The
collet‘may be released or removed from the sleeve
the bracket 43 in adjusted position when secured
by rotating the handwheel ‘I3 in the opposite
by nuts I45. The base element I39 is secured
direction. Collets for supporting and clamping
to the base 24 by bolts I46 which project through
tools of various sizes may be quickly removed
a ?ange I41 on the element. The bracket 43 has
a. ball-bearing mounted roller 44 projecting from 75 and attached to the head 36 in this manner.
The‘ sleeve 53 has an index plate 8| secured
thereto on a key 82. A key slot 83, in which the
‘key 82 projects, is aligned with and disposed
in extension of a slot 84 on its face and with an
index slot 85 on its periphery. A‘ key 88 is se
cured in the slot 84 in the face of the index
tion produces the oscillation of the head 38 and
the workpiece a. number of times for each revolu
tion, depending upon the number of cam faces
provided upon the ,camring 88.
In Fig. 2 the cam ring 88 is illustrated by way
of example as having three cam lobes I03, all of
plate by an extending stud 81 which is riveted
which are of the same arcuate slope, and it is
thereto. The key 86 extends within a slot 88
to be understood that any number of cam lobes
in the face of a cam ring 88 which permits the
I03 may be reproduced on a cam ring. The meth
ring to adjust itself on the sleeve 53. Any play 10 od of producing these like arcuate cam lobes
between the eam'ring 88 and the sleeve 53 will
which blend from the periphery of a circle struck
not operate to change the amount of tilting move
about a center of the cam ring will be explained
mentproduced to the head. A knurled nut 8|
more fully hereinafter. The cam having the three
[is threaded on the end of the sleeve 53 to secure
cam lobes I03 is employed for relieving the'lands
the cam ring 88 thereon.
.15 of a workpiece having three ?utes therein, such
It will be noted from Fig. 2 thatwhen the
as the tap 88. The relief is applied to the three
roller 44 is disposed at a dwell portion of the
rows of threads rearwardly oi’ the front cutting
cam, the index slot 85 is in position to be engaged
edges. Such relief is produced when a cam lobe
by the index pin. An additional slot 80 which is
I03 contacting the cam roller 44 forces the axis
similar to slot 88 is provided on the opposite 20. of the head 38 away from the roller, which there
side of the cam ring 88. This permits the cam
by forces the surface to be relieved progressively
ring to be mounted with either face disposed ad
toward the grinding wheel. The cam lobe will
jacent to the index plate to change from a right
then drop off of the roller 44 so that the axis
to a left hand-cam ring. With the roller 44 dis
of the head 38 will be moved back to its initial
posed in a dwell portion of the cam, the index 25 position by the tension in the spring 41 which may
slot 85 will be in a vertical position in either
be adjusted by the thumb screw 48.
position of the cam ring 88.
During the relieving operation, the handle I3 A slot 82 on the top of the housing 48 receives
may be operated through an' arc to move the
the index device 83 which is secured in position
platen I2 and therefore the head 38 and work
by a screw 84. The index device embodies a 30 piece 88 across the grinding wheel, the axis of
spring pressed index pin 85 having a frusto-coni
which is disposed parallel to that of the tool. ,All
cal end portion 88 which projects within the slot
of the rows of surfaces to be relieved are pre
- 85 in the index plate 8| . A head 81 is secured
gressively ground simultaneously as the operator
on the pin 85 by which the end portion 88 may
continuously rotates the handwheel 13 and oscil
be withdrawn from the slot 85. The pin 85 looks 35 lates the handle I3. Lateral feed ‘is applied be
the spindle 53 in predetermined position when
tween the wheel and the workpiece through the
engaging any one of the index slots 85, to there
adjustment of the handwheel I 8. The platen I5
by secure the workpiece in automatic timed posi
has a. motor riser frame I04 on a base I05 secured
tions relative to the grinding wheel.
thereto by a bolt “0 which is tightened by a
A gauging element 88, illustrated in Figs; 6 and v40 rod III. The frame supports a lead screw I08
7, may be secured in the slot 82 by a screw 88.
which is operated by a handwheel I01. The lead
The screw projects through a slot I 0| in the body
screw adjusts a grinding wheel supporting car
portion I00 of the element so that the device
.riage I08 on the upright I04. An index ?nger
may be‘ adjusted longitudinally within the slot
82. A pivoted gauging ?nger I02 projects from
the element 88 having its indexing face disposed
upon the axis of the ‘body portion I00 of the
I08 projects adjacent to the periphery of the
wheel I01, by which a ?ne adjustment may be
The base I05 may be adjusted about its center
device. This permits the element to be mounted
and clamped in any position by the bolt IIO to
in the slot as shown 'or when turned over to gauge
either a right or left hand face of a slot of a tool
have the abrasive wheels H2 and H3 disposed at
any angle to the axis of the workpiece 69. The
base of the motor riser frame I04 may be shifted
from the rear, center I53 of the platen I5 to the
to be positioned thereby. When the plunger 85
has its end 88 projecting within the slot 85 of
the index plate 8|, the workpiece 88 may then
'be inserted within the collet86 to abut against
the rod 16, as, illustrated in the ?gure. There
after, the workpiece is rotated to have a face of a
slot therein aligned with the face of the ?nger
forward center I54, as illustrated in Fig. 13. This
permits the grinding wheel to be swung around
over the platen-I2 tobe aligned with a ?ute of a
tool supported in the head 38, as illustrated in
' Fig. 9, or to operate on a workpiece I55 supported
I02 if a ?ute is to be dressed therein approxi
directly on the platen, as illustrated in Fig. 13 or
mately on center, as illustrated in Fig. 9. There
on a ?xture secured thereto.
after the workpiece is securely clamped by the 60
The motor H4 is mounted on the carriage I08,
the shaft II 5 of which supports and rotates the
grinding wheels H2 and H3. Suitable guards
turning of the handwheel 13 which draws the
collet within the sleeve 53.
If radial relief is to be ‘ground on a ?uted
workpiece such as a tap, the tap is adjusted in
“8 are carried by the motor frame for the pro
tecting of the operator, and the motor is driven
the collet to have the center of the ‘?ute aligned 65 through an electric circuit in the conventional
with the center of the tap and wheel on the wheel
manner. A plate II8 extends upwardly from the
side, as illustrated in Fig. 1. With the index pin
base I0 adjacent to the side of the table I2 in a
I 85 in engaged position and the workpiece sup
position to engage blocks II8 which are adjust
ported and driven by the collet, the workpiece is
able in a slot I2I and secured in position by the
automatically timed with the unit and wheel in 70 screws I22. The blocks “9 are adjustable on the
any engagement of the index pin 85 with a slot
side of the platen I2 for limiting the degree of
in .the index plate 8|. The index pin 85 is with
its reciprocating movement.
drawn to permit the workpiece to be rotated by
A boss I23 projects from the side of the housing
the turning of the handwheel 13 which rotatesv
48 in which a shaft I24 is adjustably retained by ,
the sleeve 53 on the balls 58 and 82. This rota 75 set screws I25. The shaft I24 supports a split
bushing I28 upon which an outboard supporting
element I21 is secured by a screw I28. A clamp-
ing-screw I28 secures the split boss to the shaft
after the male center I3I on the supporting ele
ment I21 is moved into engagement with the
female center in the end of the workpiece. The
opposite end of the supporting element I2‘! is
' provided with a female center I32 into which a
male center on the end of the workpiece may
axis of the collet 66 is‘set of! angularly to that
of the shaft 34.
This crossed relation of the
axes of' the collet and shaft 34 produces a com-.
pound radial and angular movement to the oscil
latory head 33 so that a radial and angular relief
will be provided to the tool dressed thereby.
whenlthe head 33 is disposed angularly to the
shaft 34, adjustment may then be made to‘the
plate 28 on the base 24 to bring the axes of the
project to form the support. The dog point of 10 head and workpiece parallel to the direction of
reciprocation of the platen I2. The operation of
a locating screw I56 in the bushing I26v projects
the cam faces I03 on the roller 44 will produce
into a slot I51 in the shaft I24 to prevent the
not only the radial relieving mentioned above,
turning of the bushing on the shaft so that the
but also a forward movement to the head and
center I3I is retained aligned with the center of
tool relative to the plane of the wheel so as to
the sleeve 53.
produce angular relief ‘to a radial cutting edge.
The present machine has many uses. As illus
In Fig. 8 I have illustrated a centering tool
trated in Fig. 9, the ?utes in a workpiece, such
wherein the cutting edge I34 has slight radial
as a tap 68, may be ground when the plane in
relief to prevent drift while the cutting edges,
which the wheel II3 operates is disposed parallel
to the axis of the tap. The wheel is aligned with 20 I35 and I36 have both radial and angular relief.
All of the reliefs were produced by a, form grind
the slot through the adjustment of the handwheel
ing wheel= when the tool’ was oscillated in the
I8 and is fed toward the axis of the tap by the
direction of the. resultant of the forward and
handwheel I0'I. The tap is prevented from tum
lateral movements. The lateral oscillation alone
ing by the index plate 8I and the handle I3 is
oscillated to reciprocate the tap along the pe 25 of the head 38 will not relieve radial cutting
edges, but the resultant forward and lateral
riphery of the grinding wheel. When the depth
movements produced by crossing the axes of the
of the ?ute is to be inclined, the base 24 is tilted,
tool and the shaft 34 when the single cam plate
as illustrated in Fig. 3. After grinding one of a
"operates on the single roller 44, provides the
plurality of ?utes in a tool in this manner, the
plunger 85 is then raised to permit the tool to 30 compound relief during the single dressing oper
ation of the tool. The production of this com
be indexed to have _the next adjacent ?ute
pound relief by the operation of the cam plate
machined by the wheel.
48 with the roller 44 is considered new and novel,
When the surface of a workpiece, such as the
and provides a method of relieving all of the cut
teeth of a tap, are to be relieved, the base I05 of
the motor riser frame I04 is swung through 90 35 ting edges of any rotatable form cutting tool
irrespective of whether any angular or radial re
degrees to have the face of the grinding wheel
lief is required. The employment of the plates
II2 disposed parallel to the platen I2 and the
36 and base 38 and the plate 28 and base 24
head 38 is adjusted to present the workpiece at
provides universal adjustment to the supporting
the required angle. The wheel is fed downwardly
into center position with the tool by the hand 40 head 38. The head may be employed for any
relative degree of compound tilting of the work
.wheel I01 and into grinding position by the hand
wheel I8. If four ?utes are provided in a work
piece; such as a tap, leaving four rows of sur
toward and across the face of the tool. For any
speci?c application of the compound tilting
movement the plates 28 and 36 and the base
38 may be omitted and the head 38 ?xed directly
to the sleeve 35 and the bosses 33 attached to
the base plate 24. The axis of the head 38 will be
the pin 86 of the plunger 85 is disposed in any
in crossed relationship with the shaft 34 and will
of the slots 85 of the index plate, the workpiece
be parallel to or substantially parallel to the
is rotated to have the center of the flute aligned
with the center of the workpiece and wheel on 50 direction of .movement of the table I2, depend
ing upon the angle of point to be dressed on the
the wheel side and is thereafter clamped in posi
tion. This automatically times the workpiece
Referring to Figure 10, a master cam I58 is
and wheel without the use of separate locating
illustrated which comprises a washerlike plate
devices relative to all of the index slots 85 and
associated cam surfaces. The workpiece may be 55 I6I having a slot I62 in its periphery. An
arcuate segment I63 has an arcuate surface I64
supported by the shank alo'ne, as illustrated in
struck from a center on a slightly smaller radius
Figs. 5 and 9, or by the shank and an outboard
than that from which the circumference of the
bearing as illustrated in Fig. 4, or as illustrated
plate I6I was struck. One end of the sector is
in Fig. 1, both ends of the workpiece may be sup
60 ‘secured by a pivot I65 within the slot I62 with
ported on centers and driven by a dog I".
the surface I64 blending into'the surface of the
As the handwheel ‘I3 is rotated, each cam lobe
circumference of the plate I6I. The opposite
I03 will operate on the roller 44 and cause the
end of the segment I63 is secured in adjustable
head 38 to tilt toward the face of the grinding
fixed position by a pair of studs I68 and I61. The
stone so that the surfaces of the lands toward
periphery of the plate. I6I is cut away at I68
the face of the grinding stone are relieved from
so that the sector will project above the edge of
the front edge toward the heel thereof. In the
faces to be relieved and pointed, a cam having
four cam lobes I03 and an index plate having
four slots 85 are secured to the sleeve 53. When
the plate at this point.‘
operations just described the axis of the collet
When the cam I58 is mounted on the head 38
88 and work is disposed parallel to the axis of
and a cam ring is supported on the front end
the shaft 34. An axial feed may be provided to'
the workpiece by operating the handle I3 when 70 of the head adjacent to the grinding wheel, the
the width of the face of the wheel is less than the
length of relief required.
When it is desired to provide not only a radial
relief to the cutting edges, as above described,
operation of the roller 44 On the face of the
sector I63 will cause the head, and therefore the
plate, to move away from the grinding wheel
to grind a corresponding cam surface on the
but also an angular relief to a radial plane, the 75 plate. It will be noted that the fall in the cam
surfaces of the sector I63 produces a rise on the
cam surface being produced on the plate. The
single segment I63 will be used while grinding
each of the cam faces on the cam plate to thereby
produce cam faces which are exactly alike. After
a cam with a plurality of cam surfaces has been
ground in this manner from the cam having the
single cam face it may be employed as a master
means for adjusting said head at an angle to the
means for adjusting the head and
trunnions at an angle, and means for moving saidv
head to produce an oscillatory tilting movement
thereto when the axis of the head is disposed at
an angle to the axis of the trunnions.
4. In a grinding machine having a base, a
rotatable grinding wheel, a tool supporting head,
for reproducing any number of the cams having
trunnions on which said head is oscillated, means
multiple cam surfaces.
10 for adjusting said head at an angle to the axis
Referring to Figs. 11 and 12, the center and
of said trunnions, means for adjusting said trun
driver I10 is illustrated as embodying a shank
nions and head angularly relative to said grind
portion I89 having a shouldered portion HI and
ing wheel, and means for oscillating said head
a center point I12. A rod I13 extends through
the shoulder I1I in aligned relation with the 15 and tool on the trunnions while tilting said head
and tool in the plane of their axes.
axis of the shank I69 and carries an angular
5. In a grinding machine, a work supporting
shaped driving element I14 on its end secured
platen which is movable longitudinally, a grind
thereto by a screw I15. A ?at face I16 on the
ing wheel supporting platen movable at right
driver I14 engages a ?at face I11 on the work
to said work supporting platen, a tilting
piece to rotate the workpiece in timed relation 20 .angles
head supported on said work supporting platen, a
with the shank I69. A screw I18 secures the rod
grinding wheel supported on said grinding wheel
I13 in adjusted position.
In Figure 14 the base 24 is illustrated as hav
ing the trunnions 33 attached directly thereto.
supporting platen and adjustable vertically and
angularly thereon about a vertical axis in either
a forward or rearward position, means for angu
The base 24 is provided with apertures I 80_ with 25 larly
adjusting said head on said ?rst platen'to
which the ends of the studs 23 engage when the
the work relative to the grinding wheel,
base is to be tilted upwardly, as in Figure 3.
and means for tilting said head.
As illustrated in the present ?gure, the base is
6. In a grinding machine, an oscillatory head,
mounted on a center I19 for angular adjustment
a spindle on said head, an index plate on said
indicated by a ?nger I8I and the index marks 30 spindle, a cam on said spindle, a key and slot con
I82. The workpiece I83 may be set off in this
nection between the mating faces of said plate
manner relative to the grinding wheel an amount
and cam to permit the cam to freely adjust itself
equal to the angle of the point to be dressed
on said spindle.
on the workpiece. The trunnions may be di
'7'. In a grinding machine, an oscillatory head,
rectly attached to the base when the axis of the
a spindle on said head, an index plate on said
head is parallel to the axis of the trunnions or
spindle, a cam on said spindle, a key and slot
when disposed at a ?xed angle relative thereto.
connection between the mating faces of ‘said
From the drawings it will be understood that
plate and cam, said index plate having a stop
the grinding machine of the present invention is
notch for each cam surface on the cam, a roller
of the universal type, being capable of grinding 40 against which said cam is urged, and means for
slots or ?ats on any type of workpiece which
supporting a workpiece in said spindle in auto
may be clamped to the platen or to a ?xture
matically adjusted position relative to the plu
mounted thereon. The machine is also useful
rality of notches and cam surfaces.
for relieving the cutting edges radially as well
.8. In a grinding machine, an oscillatory head
as producing combined radial and angular relief 45 for supporting a workpiece with its axis disposed
to the cutting edges of tools. The relief may be
at an angle to .the axis of oscillation, a cam for
applied to the angularly disposed point of the
producing a combined oscillating and tilting
tool as well as to the body thereof which is paral
movement to said head, said cam being of trun
lel to the tool axis. The production of the com
cated conical shape with the faces of the cam
bined radial and angular relief is accomplished
surfaces thereof disposed at an angle to the axis
through the employment of a single cam plate
of the head, and a cylindrical roller engageable
which oscillates the tool supporting head in a‘
with said cam surfaces.
combined forward and sideward movement.
9. In a grinding machine, an oscillatory head,
When-the arm 31 is forced upwardly to tilt the
a cam for oscillating said head, said cam having
a peripheral groove, and an arcuate segment piv
cam on the head 38 away from the roller 44. the
oscillating action is eliminated from the head and
oted at one end in said groove and adjustably
workpiece and a cylindrical surface may then be
secured at its other end. said segment being
ground thereon.
struck from an arc of smaller radius than the
circumference of said cam.
What is claimed is:
10. In a grinding machine, a work supporting
1. In a machine, a work supporting head, a 60
head, a shaft on which said head is oscillatably
cam on said head, a base, oscillatory means on
mounted a cam on said head, and means sup
said base, means for supporting said head above
porting said head at an angle to the shaft to
said oscillatory means for angular adjustment
cause it to tilt at an angle when oscillated by the
about a vertical axis, a roller on said base against
cam. ,
which said cam is urged for oscillating said head,
11. In a grinding machine for an element hav
and a support on which said base is angularly ad
ing a ?ute, a head having a rotatable sleeve, a
collet in said sleeve, a center in said collet and an
2. In a machine, an oscillatory work support
adjustable rod extending laterally through the
ing head, trunnions on which said head oscillates,
body of the center having a laterally disposed ?at
means for adjusting said trunnions at an angle
surface engageable with a ?ute on said element
to said head, a cam on said head by which said
for driving the element.
head is oscillated, and means for adjusting the
12. In a cam, a disc having a cam surface on
head and trunnions angularly as a unit.
its edge-provided with a large initial drop pro
3. In a machine, an oscillatory work support
ing head, trunnions on which said head oscillates, 75 duced by striking a circular arc of smaller radius
than the arc of the disc from a point on the
edge of the disc with the center from which the
ing said head for oscillation, means between said
head and shaft for permitting said head to be ad
‘ arc was struck moved from the center of the disc
toward the cam surface on a radial line and shift
ed laterally of said radial line.
13. Inv a grinding machine, an oscillatory head,
a cam for oscillating said head, said cam em
bodying a disc having a plurality of like cam sur
faces on its edges, said surfaces being struck on a
justed about a vertical axis, a cam mounted on
said head, a roller adjustable on an are about said
vertical axis for engagement with said earn in
various positions of adjustment of said head, and
means for resiliently urging said
gagement with said roller.
circular arc of smaller radius than the radius of
19. A cam
for oscillating
a circular
a head
plate of
a cam
the disc with the center offset from that of the 10
surface formed thereon by a circular arc of
disc on a radial line and shifted laterally of said
smaller radius than that of the circle of the plate
radial line.
with the center of the circular are 50 ‘located that
14. In a machine, a base which is angularly
the circular are if extended would cross the cir
adjusted about its center, a shaft carried by
c said base with its axis disposed normal to said 15 cumference of the plate at a substantial angle
relative thereto.
center, a work supporting head having an axis
20. A cam for oscillating a head of a grinding
substantially parallel to said shaft, means sup
machine embodying a circular plate having a plu~
porting said head on said shaft which permits the
head to be angularly adjusted relative to said
shaft in a plane substantially parallel to the plane
in which the base is adjusted.
15. In a machine, a base angularly adjusted
about a vertical center, a shaft on said base hav
rality of cam surfaces formed thereon by circular
arcs having smaller radii than the radius of the
circular plate with the‘ centers of the circular
arcs so located that the circular arcs if extended
would cross the circumference of the plate at a
ing its axis disposed horizontally, a work sup
substan/tial angle relative thereto.
21. in a machine having a longitudinal axis
porting head, and a support adjustable about a 25
disposed in a horizontal plane, a work supporting
vertical axis for attaching said head to said shaft
head having an axis upon which the work is sup
for producing a compound tilting movement to
ported, an element having an axis on which said
the head about said shaft and in the plane of the
head is tiltably mounted, the axis of the head and
axis of said shaft.
16. In a machine, a work supporting head, a 30 the axis of the element being parallel to each
other and to said longitudinal axis of the ma
shaft disposed at an angle to the axis of the head,
chine, a base supporting said element, means sup
and cam means for oscillating said head on said
porting said base on said machine, said head. eie~
shaft laterally of its axis to have its axis tilt
ment and base being adjustable angu'iarly rela
longitudinally of its length,
tive to each other in horizontal planes, a roller on
1'7. In a machine, a base, a plate adjustable
said base, and a cam on said
about a vertical axis, a head, a shaft for sup
with said roller when the axes of the head and
porting said head for oscillation, means between
machine are parallel and with the axis
the ele
said head and shaft for permitting said head to
ment disposed out of parallel relation thereto, the
be adjusted about a vertical axis, a cam mounted
on said head, and a roller adjustable on an arc 40 degree of said out of ‘parallel relationship con
trolling the degree of tilt to the head ‘laterally
about said vertical axis for engagement with said
and parallel to the longitudinal axis of the ma»
cam in various positions of adjustment of said
chine when the cam is rotated relative to the
18. In a machine, a base, a plate adjustable
about a. vertical axis, a head, a shaft for support
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