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Патент USA US2082736

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June 1', 1937.
H. s. INDGE
2,082,736
TRUING' APPARATUS FOR LAPPING MACHINES
Filed Sept. 28, 1955
3 Sheets-‘Sheet 1 ‘
r,___.._____.______.._...___.___
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3mm
HERBERT 5'. INDG'E
WITNESS
JMW w, Wm. wmm
June ‘1, 1937.
2,082,736
H. S. INDGE
TRUING APPARATUS FOR LAPPING MACHINES
Filed Sept. 28, 1935
3 Sheets-Sheet 3
F75’
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HERBERT 5.1m) GE
W / TNESS
Patented June 1, 1937
UNHTED STATES
9PM
Herbert S. Indge, Westboro, Mass, assignor to
Norton Company, Worcester, Mass, a corpora
tion of Massachusetts
Appiication September 28, 1935, Serial No. 42,583
7 Claims.
This invention relates to lapping or grinding
machines, and more particularly to a lap or
grinding wheel truing mechanism.
‘
One of the objects of this invention is to pro
5 vide a simple, thoroughly practicable truing ap
paratus for truing the flat operative face of a
lap or abrasive wheel. Another object is to pro~
vide a truing apparatus for truing the opposed
operative flat faces of two opposed lapping or
10 grinding wheels. Another object is to provide
a truing apparatus which is capable of truing
the two opposed operative faces of a pair of op
posed lapping or grinding elements simultane
ously.
A further object is to provide a pivotally
mounted truing tool carrier for swinging the tru
ing tool or tools through an arcuate path across
the operative face or faces of a lap or grinding
wheel. Another object of this invention is to
provide a pivotally mounted truing tool holder
20 which is rocked through an arcuate path across
the face of the grinding wheel by a hydraulically
actuated mechanism.
A further object is to provide a hydraulically
5 actuated mechanism for controlling the move
2
ment of a truing tool across the face of a lap
or grinding wheel, in which the truing speed may
be readily controlled. A further object is to pro
vide a hydraulically actuated mechanism for
moving a truing tool through an arcuate path
across the operative face of a lap, in which both
the intake and exhaust of ?uid are throttled to
de?nitely control the rate of movement of the
1.
IL)
truing tool. Other objects will be in part obvi
35 ous or in part pointed out hereinafter.
The invention accordingly consists in the fea
5
larged scale, of the pivotal support for the tru
ing apparatus;
Fig. 5 is a cross~sectional View, on an enlarged
scale, taken approximately on the line 5-5 of
Fig. 1;
Fig. 6 is a fragmentary cross-sectional view,
on an enlarged scale, taken approximately on the
line i§—6 of Fig. l, of the binder mechanism for
locking the upper lapping element in any de
sired position;
Fig. 7 is a cross-sectional View through the con
trol valve, on an enlarged scale, taken approxi
mately on the line l—-'! of Fig. 2;
Fig. 8 is a cross-sectional view, on an enlarged
scale, taken approximately on the line 8-8 of 15
Fig. 2;
Fig. 9 is a vertical section showing a modi?ed
form of mounting for the truing tools;
Fig. 10 is a cross-sectional view, taken ap
proximately on the line l?-H) of Fig. 9, showing 0
the clamping mechanism for the truing tools;
and
Fig. 11 is a fragmentary cross-sectional view
taken approximately on the line H-—l I of Fig. 9,
showing the adjusting mechanism for the tru 25
ing tools.
In the embodiment of the invention selected
for illustration, a ‘lapping machine has been
shown comprising a base II adapted to support
a lower lap l2 and an upper lap I3. The upper
and lower laps are arranged for a relative rotary
motion to produce a predetermined lapping op
eration. In the preferred construction, both the
upper and the lower laps are rotated preferably
in different directions.
-
35
Power may be supplied to the machine in any
tures of construction, combinations of elements,
and arrangements of parts, as will be exempli?ed
in the structure to be hereinafter described, and
convenient manner, such as by means of a belt
the scope of the application of which will be in
dicated in the following claims.
In the accompanying drawings in which is
shown one of various possible embodiments of
the mechanical features of this invention,
the base I l- of the machine and arranged to ro 40
tate both the upper and the lower lap. A worm
2! is fastened to the shaft l6 and meshes with
a worm gear 22 keyed to a vertical sleeve 23
which is rotatably supported in a bearing 241 with
in the base of the machine. The upper end of the
sleeve 23 supports a spider 25 which in turn
supports the lower lapping wheel E2. The ro
Fig. l is a side elevation of a lapping machine
and truing apparatus embodying this invention,
having parts broken away to more clearly show
the construction;
Fig. 2 is a fragmentary cross-sectional view,
50 on an enlarged scale, taken approximately on
the line 2—-2 of Fig. 1;
Fig. 3 is a combination cross-sectional view and
elevation of the mount for the truing apparatus
taken approximately on the line 3—3 of Fig. 2;
55
(Cl. 125—11)'
Fig. ,4 is a fragmentary elevation, on an en
arranged to rotate a pulley l5 keyed to a shaft
16 journaled in bearings ll, l8, l9, and 20 in
tary motion applied to pulley i5 is transmitted
through shaft l6, worm 2i, worm gear 22, sleeve
23 and spider 25 to rotate the lower lap 52. The
details of the mounting for the upper lap have
not been shown in detail in the present case,
since they are not considered to be a part of the
present invention. For further details, reference 65
2
2,082,736
may be had to my prior Patent No. 1,870,328
to hold the shaft 56 in the desired vertical posi
dated August 9, 1932.
tion.
The lapping elements or wheels I2 and I3, as
illustrated, are each formed as an annulus of ce
The outer end of the arm 54 is provided with
an enlarged head 80 which is arranged to sup
port a pair of opposed diamonds or truing tools
ramic bonded abrasive grains made like a grind
ing wheel, each of which is provided with a sub
stantially ?at abrading or lapping surface for
simultaneously engaging and abrading or lap
ping the opposed faces of a Work piece.
The rotatable upper lap I3 is supported by
10
means of a spider 30 mounted on the lower end
of a rotatable spindle 3L
The spindle Si is
rotatably supported in bearings (not shown) in
a vertically movable sleeve 32 which is slidably
15 mounted within a projecting portion 34 of an
arm 35. The arm 35 is formed integrally with
a Vertically extending column 36 which is ?xed
to the base II. The lap I3 and spindle 3! may
8! and 82, each of which is separately adjusted
relative to the head Sfi. The truing tool 8| is
mounted in the end of a spindle 83 which is slid
ably keyed by means of key 83, in an aperture 85
within head 30. An adjusting screw 86 is screw
threaded into a threaded aperture 8'! in the spin
die 83 and serves to adjust the position of the
spindle 8E and the truing tool 8I relative to the
head 89. In order that the screw 86 may be
held against endwise movement, it is provided
with an enlarged head 89 which ?ts within a
counterbored recess 98 in the head 80 and is held
in adjusted position relative thereto by means of
be rotated from any suitable source of power,
a cap or cover plate 9|.
but as illustrated in the drawings is driven by
tool 82 is held in a similar spindle 35 which is
slidably keyed by means of a key ‘96 within an
aperture 97 within the head 88 and is arranged
to be adjusted relative thereto by means of a
screw 98 which is screw threaded into a threaded
aperture 99 within the spindle 95. The screw
98 is provided with an enlarged head II!!! which
?ts within a counterbored aperture I Ell in the
head 3i] and is held in adjusted position therein
by means of a cover plate I02. It is readily ap
parent from the foregoing disclosure that the ‘
diamonds or truing tools BI and 82 may each be
means of a belt from the shaft I6. A pulley All]
is mounted on the shaft I6 and is connected by
means of a belt 4! with a pulley 42 mounted on
the upper end of the upper lap spindle M. The
25 belt llI passes over a pair of idler pulleys 43 (only
one of which has been illustrated in Fig. l) which
are rotatably supported on a transverse shaft M.
It will be readily apparent from the foregoing
disclosure that rotation of the shaft It by means
30 of driving pulley I5 serve to simultaneously ro
tate both the upper lap I3 and the lower lap i2.
In order that the laps I2 and I3 may be main
tained with proper operative surfaces for pro
ducing the desired lapping operation, a suitable
truing apparatus is essential to permit a truing of
the operative faces of the laps when necessary.
In the embodiment of the invention illustrated,
a pivotally mounted truing apparatus is provided
in which a truing tool is mounted on a rock arm
40 and arranged to be swung through an arcuate
The diamond or truing
adjusted relative to the head by manipulation of
screws 86 and 98.
In order that the diamonds or truing tools
may be locked in adjusted positions on the head
88, the opposite sides of the head are provided
with slots I55 and I?? which enable portions of
the head to be sprung to bind the spindles 83
and 95 in their adjusted position. A binding
screw I Ill passes through a clearance hole in a 40
path across the operative face or faces of the
boss I88 and is screw threaded into a boss I09 t0 '
lap. As illustrated in the drawings, this mecha
nism comprises a vertically mounted rotatable
clamp the spindle 83 and diamond BI in the de
sired adjusted position. A binding screw IIIl
passes through a clearance hole in boss III and
shaft 50 supported in bearings 5| and 52 on a
45 bracket 53 which is rigidly mounted on the col
umns 36. An arm 54 is mounted on the shaft
50. The arm 54 is provided with an elongated
head 55 which is slotted at 55 and arranged to
be clamped in adjusted position on the shaft 53
50 by means of clamping screws 5'! and 58. The
screws 51 and 53 pass through clearance holes in
bosses 59 and 66 and are screw threaded into
bosses GI and 62 so, that the head 55 may be
readily clamped in adjusted position on the ver-v
A push screw 65 is screw threaded
55 tical shaft 5il._
in a boss 66 and abuts against a boss 5?. This
push screw serves to spread or expand the head
55 when it is desired to unclamp the arm 54. An
end thrust and locating collar ‘I0 serves to locate
60 the head 55 in the desired position on the shaft
50. The collar ‘It is preferably a split collar and
arranged to be clamped in adjusted position on
the shaft 59 by means of a clamping screw ‘II.
The shaft 5c is rotatably mounted in bearing
brackets 5i and 52 which are ?xedly mounted on
the column 36. A thrust washer or collar '55
which ?ts on a reduced portion ‘IS on the lower
end of the shaft 50 and bears against the upper
surface of bearing 52 serves to take up the verti
cal thrust of the shaft 50 and its associated parts.
A similar collar or thrust washer 71 also ?ts on
the reduced portion 76 and is held in adjusted
position by a pair of lock nuts ‘I8 and ‘IS. The
thrust collars ‘l5 and TI together with the lock
nuts 18 and ‘I9 serve as an end thrust bearing
is screw threaded into boss II2 to serve as a
clamp for the spindle 95 and the diamond 82 in
the desired adjusted position. It will be readily
apparent from the foregoing disclosure that the
diamonds BI and 82 may be readily and precisely
adjusted relative to the head lit} by manipulation
of the clamping screws Iil'l and H6 and. the ad
justing screws 36 and 98.
To attain one of the objects of this invention,
it is desirable to provide a suitable power oper
ated mechanism for moving the truing tools
across the face of the laps l2 and I3 at a slow
uniform rate to true the operative faces thereof
to form the desired lapping surfaces. In the pre
ferred construction, a hydraulically actuated
mechanism is provided to swing the arm 54 to
pass the truing tools 8! and 82 through an arou 60
ate path across the operative ?at faces of the
lapping wheels. A ?uid pressure cylinder I26 is
pivotally mounted on a stud IZI which is in turn
supported in a bracket i522 projecting from the
column 36. A piston I23 is slidably mounted
within the cylinder 529 and is connected by means
of a piston rod I243 with a stud I25. Stud I25 is
also connected with one end of a connecting rod
I26, the other end of which is pivotally connected
to a stud I27. The stud I2? is connected to one
end of a rock arm I29, the other end I30 of
which is locked to the upper end of the shaft Ell
by means of a set screw I3I. It will be readily
apparent from the foregoing disclosure that when
75
2,082,736
?uid is admitted to the cylinder I20, causing the
to provide a slow uniform movement of the tru
piston I23 to move therein, this motion will be
ing tool.
transmitted through the connecting rod I24, stud
The valve stem MI is provided with a serrated
portion I55 which is engaged by a spring pressed
I25, connecting rod I26, to rock the arm I29
which in turn serves to‘ rock the vertical shaft 50
and thereby swing the arm 54 and the truing
tools 8| and 82 across the operative faces of the
laps I2 and I3.
A ?uid pressure system is provided to sup-ply
10 ?uid‘ under pressure to operate the piston I23.
This system comprises a reservoir II5 within the
base of the machine. A pump II6 draws ?uid
from the reservoir II5 through a pipe I32 and
forces ?uid under pressure through a pipe I33 to
a control valve I34. A pressure relief valve I35
is connected in the pipe line I33 to return excess
?uid through an exhaust pipe I36 to the reser
voir I I5. The control valve I34 is of a slidable
piston type and comprises valve pistons I38, I39,
20 and I40 which are formed integrally with a
valve stem I4I. This’valve serves as a reversing
valve and also‘ a speed control or throttle valve
to control the direction and speed of movement
of the truing tool or tools across the operative
25 faces of the laps. Fluid under pressure from the
pipe I 33 enters a valve chamber I42 formed be
tween the valve pistons I38 and I39 and passes
out through a pipe I43 into a cylinder chamber
I44 to cause the piston I23 to move toward the
30 right, as viewed in Fig. 2, which serves to rock
the arm 54 in a counterclockwise direction. Dur
ing this movement of the'arm 54, ?uid under
pressure exhausts from a cylinder chamber I45,
a pipe I46, a valve chamber I48 formed between
35 valve pistons I39 and I40 and out through an ex
haust pipe I49 and through the pipe I36 into
the reservoir H5.
The valve stem MI is provided with an operat~
ing knob or handle I50. When it is desired to
40 reverse the direction of movement of the arm 54
so as to cause the truing tools to move in a clock
wise direction (Fig. 2), the knob I50 is moved into
a ‘position I50a‘, as shown in broken lines in Fig.
2, which serves to shift the valve pistons I36, I39,
45 and I40 into a reverse position so that ?uid under
pressure from the pipe I33 will pass through
valve chamber I48 between the valve pistons I39
and I40 and through pipe I46 into a cylinder
chamber I45 to cause the piston I23 to move to
50 ward the left, as viewed in Fig. 2, so as to swing
plunger I56 so that the valve stem I4I may be
readily rotated to the desired position and held
in the adjusted position. In order to throttle ‘
the ?uid passing to and from the control valve,
the valve pistons I 38 and I 40 are each provided
with throttling grooves I60 (Figs. 2 and 8).
There are four openings or holes I59 through the
valve sleeve I6I and four grooves I60 which
extend longitudinally of the valve piston I40
forming lands I55 therebetween. By rotating the
valve stem I4I, the lands I65 between the grooves
I68 may close the valve sleeve openings I59 to a
greater or lesser extent to throttle the ?ow of
?uid therethrough. Fig. 8 shows a cross section
through the valve taken on the line 8-—8 of
Fig. 2 through the valve piston I40. The valve 20
piston I38 is similarly provided with grooves and
lands so that the ?uid entering or exhausting
from the valve chamber I42 may also be throt
tled to the same extent. It will be readily ap
parent from the foregoing disclosure that by
endwise movement of the valve stem I4I, the
?uid under pressure within the system may be
reversed to move the piston I23 in either di
rection so as to move the truing tools either
in a clockwise or counterclockwise direction
across the face of the laps to be trued. By ro
tating the knob I50 and valve stem I4I, the
?uid entering or exhausting from the system may
be varied from the maximum to a point where
the ?uid is entirely out off, that is when the
lands I65 (Fig. 8) are turned to entirely block
the ports I59 in the valve sleeve ‘I6I. By rotat
ing the valve stem to the desired extent, the
speed of movement of the truing tools may be
accurately controlled to produce the desired lap
ping surface.
40
It may be desirable to arrange the truing tools
BI and 82 in axial alignment and diametrically
opposed to each other so that both of the laps
I2 and I8 may be simultaneously trued. A modi
?ed construction has been illustrated in Figs.
9, l0, and 11, in which the truing tools 8| and 82
are arranged diametrically opposite to each other.
The arm 54, as shown in Figs. 9, l0, and 11, is
provided with an enlarged head ISI having a 50
the arm 54 and the truing tools BI and 82 in a
vertically extending aperture I92 arranged to
clockwise direction through an arcuate path
receive a pair of diamonds or truing tool holders
I93 and I94. The truing tool holder I94 is pro
vided with a reduced threaded portion I95 which
engages or meshes with a threaded aperture I96 55
across the operative faces of the laps I2 and I3.
During this ‘movement of the piston I23, ?uid
55 under pressure exhausts from the cylinder cham
ber I44 through the pipe I43, the valve chamber
I42 between the pistons I38 and I39, and out
through a pipe I52 and the pipe I36 to the reser
voir II5.
60
3
In order that the laps I2 and I3 may be trued
to produce the desired lapping surface, it is de
sirable to provide a speed controlling device for
the ?uid pressure system so that a slow uniform
traverse of the truing tool across the face of the
laps may be obtained. This is preferably accom
plished by providing a suitable arrangement for
throttling the. ?uid passing through the control
valve I34. In the preferred construction, the
valve I34 is provided not only with a longitudinal
motion to cause a reversal of the direction of
?ow of ?uid within the system but is also pro
vided with a rotary motion which serves to throt
tle the ?ow of ?uid through the valve. The valve
is so constructed that both the intake and ex
haust of ?uid are throttled to the same extent
within the diamond holder I93. A pair of binding
screws I91 and I98 are arranged to bind the
diamond holders I93 and I94 in place on the
head. Details of only one of the clamping mech
anisms have been illustrated since they are both 60
identical in construction.
As shown in Fig. 10,
the clamping screw I9‘! passes‘ through a clear- ‘
ance hole in a slidably mounted bushing 200 and
is screw threaded into a central aperture within
the slidably mounted bushing 20I. The bushings 65
200 and 20I are each provided with a trans
versely extending fragmentary cylindrical sur
face 202 and 203 respectively which are shaped
to mate with the periphery of the truing tool
holder I93 and I94 respectively. It will be read
ily apparent from the above disclosure that when
the screw I9‘! is tightened, the bushings 200 and
20I are drawn together to clamp the diamond
holder I93 in adjusted position.
In order that the truing tools 8| and 82 may
4
2,082,736
be readily and separately adjusted, the inner
arm 54 is adjusted vertically on the shaft 50 and
ends of the truing tool holders I93 and I94 are
formed as .a spiral gear 255 and 206 respective
ly. A pair of spiral gears 251 and 208 mesh with
the gears 205 and 205 respectively. Gears 2G1
clamped in adjusted position by means of the
locating collar 10 and the arm is then clamped
in position thereon by means of the clamping
screws 51 and 58. The lap I2 is then set in rota
and 208 are mounted on rotatable shafts 209 and
tion and the valve I34 operated by means of the
knob I50 serves to pass the truing tool 82 across
~2I0 respectively and are arranged to be ad
justed by knobs ZII and 2I2 respectively. The
binding screws I91 and I98 are maintained in a
clamped position except during adjustment of
the diamonds 8| and 82.
If it is desired to ad
just the diamond 82, the clamping screw I98 is
loosened to unclamp the holder I94 while the
clamping screw I81 is in a clamped relationship
to hold the diamond holder I93 against rotation.
Then the knob M2 is turned to rotate the shaft
ZIO, spiral gear 208, spiral gear 295, which serves
to rotate the diamond holder I94. This move
ment rotates the screw I55 within the threaded
20 aperture I96 and due to the fact that the holder
I93 is stationary serves to cause an endwise
movement of the holder I94 to adjust the dia
mond 82 as desired.
Similarly, when it is desired to adjust the
position of diamond BI, the clamping screw I98
is locked in a clamping position to prevent rota
tion of the holder I94. The clamping screw I91
is unclamped to‘ permit rotation of the holder
I93 and the adjusting knob 2II is rotated to
cause a rotation of the spiral gear 201 which
serves to rotate spiral gear 265 and thereby cause
a rotation of the diamond holder I93. Due to
the fact that the threaded projection I95 is
held stationary, the threaded aperture I96 is
rotated on a ?xed threaded portion I95 and
causes an endwise motion of the holder I93 to
adjust the diamond BI as desired.
The upper lap I3 is arranged to be moved
vertically with relation to the lower lap. This
may be accomplished either by means of a man
ually controlled or automatically controlled
mechanism. For the sake of simplicity of illus
tration, a manually operable mechanism has
been provided comprising a hand whleel I10
45 which is mounted on the outer end of a shaft
I1I, the inner end of which carries a gear IBI
meshing with a rack bar I 32 on the vertically
movable sleeve 32. By manipulating the hand
wheel I15, the upper lap may be raised or lowered
as desired. This mechanism serves to bring the
upper lap into operative relation with the work
during the lapping operation and also serves to
lower the lap until the operative face of the lap
engages the truing tool for a truing operation.
In order that the upper lap may be held against
vertical movement in a ?xed position during the
truing operation, means are provided to lock the
sleeve 32 in an adjusted truing position. This
mechanism comprises a clamping screw I85
60
which comprises two slidably mounted bushings
I86 and I81 each of which is provided with a
partial cylindrical surface I88 and I89 respec
tively, which engage the periphery of the sleeve
32.. The clamping screw I 85 passes through a
clearance hole in the bushing I86 ‘and is screw
threaded into an. aperture I53 in the bushing
I81. By tightening the screw I85, the bushings
I86 and I81 are drawn together to clamp the
sleeve 32 in rigid engagement with the projec
tion 34 of'the arm 35 so as to lock the upper
lap in a truing position. Truing tool BI may then
be oscillatedv through an arcuate path across the
operative face of the lap I3 by oscillating the
arm 54 by means of a fluid pressure mechanism.
_ In the operation of this truing apparatus, the
the operative face of the lower lap. By adjust
ing the screw 98, the truing tool 82 may be
brought into the desired truing relation with the
operative face of the lap I2. The truing tool
may then be oscillated through an arcuate path
across the face of the lap until the lap is trued
to the desired extent. By adjusting the position
of the truing tool, any amount of material may
be trued from the lap as desired.
To true the upper lap I3, the hand wheel I10
is rotated to turn the gear I8I which meshes
with the rack bar I82 on vertically movable
sleeve 32. By manipulating the hand wheel I10, 20
the upper lap I3 may be lowered until the opera
tive face of the lap engages the truing tool 8|.
The sleeve 32 may then be locked in a truing
position by means of the clamping screw I85.
The truing tool 8I may vthen be oscillated
through an arcuate path across the operative face
of the lap I3 by oscillating the arm 54 by means
of the ?uid pressure mechanism. By turning
the adjusting screw 86, the diamond or truing
tool 8| may be precisely adjusted relative to the ‘
lap I3 to true its operative surface to the desired
extent.
In the operation of the modified construction,
the truing tool supporting arm 54 is moved so
that the diamond 82 is opposite- to the lap I2. '
The diamond 82 is then adjusted downwardly
to contact with the surface of the ‘lap I2. The
upper lap I 3 is then lowered by manipulation
of the hand wheel I10 so that the operative
surface of the lap I3 is brought into truing en 40
gagement with the truing tool 8|.
Then, by
manipulation of the ?uid pressure mechanism,
the truing tools may be passed through an arcu
ate path relative to the laps I2 and I3 to simul
taneously true the opposed operative surface of
the two laps.
It will thus be seen that there has been pro
vided by this invention apparatus in which the
various objects hereinabove set forth together
with many thoroughly practical advantages are 50
successfully achieved.
As many possible embodiments may be made
of the above invention and as many changes
might be made in the embodiment above set
forth, it is to be understood that all matter
hereinbefore set forth, or shown in the accom
panying drawings, is to be interpreted as illus
trative and not in a limiting sense. '
I claim:—
‘
’
-
1. An abrasive wheel truing apparatus com
prising a rotatable abrasive wheel, a movable
truing tool support, a truing tool adjustably
mounted thereon, means to feed the truing tool
relatively toward and from the operative face
of said abrasive wheel, means including a fluid
pressure piston and cylinder to move said sup
port to pass the truing tool across the operative
face of said wheel, and a control valve for regu
lating both the direction and speed of‘ move
ment of the truing tool relative to the operative
face of said abrasive wheel.
2. A truing apparatus for a lapping machine
comprising a rotatable lapping wheel having an
operative ?at face, a movable truing tool sup
port, a truing tool adjustably mounted thereon,
2,082,736
means to adjust the truing tool to feed the tool
toward and from the operative face of said lap
ping wheel, means including a ?uid pressure
piston and cylinder to move said support and
traverse the truing tool across the operative face
of said lap, and a single control valve therefor,
said valve being movable in one direction to con
trol the direction of movement of the truing tool
and movable in a second direction to control the
10 speed of movement of the truing tool relative to
said lap.
3. A truing apparatus for a lapping machine
comprising a rotatable lapping wheel, a pivotally
mounted truing tool support, a truing tool ad
15 justably mounted thereon, means to adjust the
truing tool relative to the support to permit feed
ing the truing tool toward and from the opera
tive face of said lapping wheel, means includ
ing a ?uid pressure piston and cylinder to swing
the support so as to traverse the truing tool
across the operative face of said lap, a ?uid con
trol valve therefor, and a manually operable
means to move said valve in one direction to
change the direction of movement of the truing
, tool relative to the lap and to move said valve in
a second direction to hold it in a predetermined
position to regulate the speed of movement of the
truing tool relative to the operative face of the
lap.
4. A truing apparatus for a lapping machine
comprising a rotatable lapping wheel having an
operative ?at face, a movable truing tool sup
port, a vertical pivot for said support, a truing
tool adjustably mounted thereon, means to ad
just the truing tool to feed the truing tool to
ward and from the operative face of the lapping
wheel, means including a fluid pressure piston
and cylinder to swing said truing tool across the
face of said lap, a single control valve therefor,
and means to move said valve longitudinally in
one ‘direction to reverse the movement of the tru
ing tool and to rotate and hold said valve in a
predetermined position to control the speed. of
movement of the truing tool across the oper
ative face of said lap.
5. A truing apparatus for a lapping machine
5
comprising a rotatable lapping wheel, a pivotally
mounted truing tool support, a truing tool ad
justably mounted thereon, means to adjust the
truing tool to feed the tool toward or from the
operative face of the lap, means including a ?uid
pressure piston and cylinder to move said support
to traverse said tool across the face of said lap, a
control valve therefor, and means to move said
valve longitudinally to reverse the direction of
movement of the truing tool relative to the lap 10
and to rotate and hold said valve in a desired
rotary position to throttle both the intake and
exhaust of ?uid to and from said cylinder to
control the speed of movement of the truing tool
relative to the operative face of said lap.
15
6. A truing apparatus for a lapping machine
comprising a pair of opposed ?at relatively ro
tatable lapping wheels, a movably mounted tru
ing tool support, a pair of opposed truing tools
adjustably supported thereon, means to inde 20
pendently adjust each of said tools relative to
the support, means including a ?uid pressure
piston and cylinder which are operatively con
nected to move said support to simultaneously ,
traverse the truing tools across the operative 25
faces of said lapping wheels, and a control valve
for regulating both the direction and speed of
movement of the truing tools relative to the op
erative faces of said lapping wheels.
7. A truing apparatus for a lapping machine
comprising a pair of opposed flat relatively ro
tatable lapping wheels, a movably mounted tru
ing tool support, a pair of opposed truing tools
adjustably supported thereon, means to inde
pendently adjust each of said tools relative to
the support, means including a ?uid pressure pis
ton and cylinder which are operatively con
nected to move said support to simultaneously
traverse the truing tools across the operative
faces of said wheels, and a control valve in said
system which serves when moved in one direc
tion to reverse the direction of movement of the
truing tool and when rotated serves to throttle
the ?uid under pressure to control the speed of
movement of the truing tools across said lap.
HERBERT S. INDGE.
30
35
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