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Патент USA US2117979

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May 17, 1938.
W. OGILVIE
2,117,979
GRINDING MACHINE
Filed April 4, 1936
4 Sheets-Sheet l
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WILLIAM OGILVIE v
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May 17, 1938.
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w, OGILVIE
2,117,979
GRINDING MACHINE
Filed April 4, 1936
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May 17, 1938.
W. OGlLVlE
2,117,979
GRINDING MACHINE
Filed April 4, 1956
4 Sheets-Sheet 5
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WILLIAM OGILVIE
May 17, 1938.
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GRINDING
2,117,979
MACHINE
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Filed April 4, 1956
4 Sheets-Sheet 4
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WILLIAM OGILVIE
BY
‘y/yatzmm
ATTORNEYS
2,117,979
Patented May 17, 1938
UNITED STATES PATENT OFFICE
2,117,979
GRINDING MACHINE
William Ogilvie, Knowle, England, assignor to
B. S. A. Tools Limited, Birmingham, England,
a British company
Application April 4, 1936, Serial No. 72,785
In Great Britain April 13, 1935
8 Claim. (01. 125-11)
grinding and control wheels, and refers more
with the ?xed tracer, can be locked or made in
operative and the former held clear of engage
ment with the tracer, to permit of the use of
the trueing device in the ordinary ‘way for effect
ing the trueing of a plain face on the peripheries
particularly to wheel trueing mechanism 01' the
of the grinding and the control‘ wheels.
This invention relates to improvements in ma
chines for grinding cylindrical bodies, of the kind
wherein the work to be ground is supported be
tween the co-acting faces of peripherally opposed
kind wherein a diamond or other cutting de
The invention also consists in the provision of
vice is carried on a transversely movable slide, - means which are adapted to enable the operator
adapted to be reclprocated by any suitable means,
whereby the cutter is caused to traverse across
the periphery of the grinding or the control
wheel to effect the trueing of same, the said
slide being carried on a longitudinally movable
slide mounted on the hood or cover of the control
wheel or the grinding wheel.
The object of the invention is to provide, in
combination with trueing mechanism of the
20
to manually assist the action of the mechanism
in imparting movement to the slide when the 10
tracer is passing over a steep angle on the former.
Two constructions according to this invention
are illustrated in the accompanying drawings by
way of example, in which:
Figure 1 shows a side elevation of the upper 15
part of a centreless grinding machine provided
with one arrangement of form trueing mecha
aforesaid kind, a form trueing mechanism where
nism, constructed in accordance with this inven
by the peripheries of the grinding wheel and the
tion.
control wheel can be automatically shaped or
Figures 2 and 3 show respectively, on an en
, shape or form of ‘the cylindrical body it is desired
larged scale, a part sectional side elevation and
a plan view of the form trueing mechanism.
to be ground. The term "cylindricaP’ as herein
employed to define the type of body to be ground,
an end elevation and a part sectional ‘view taken
trued to any desired shape conforming with the
is intended to include bodies of rotation other
than true cylinders, i. e. bodies of-rotation which
are ?gured or vary in circumference along their
length.
~
According to this invention, as applied to true
30 ing mechanism of the aforesaid kind, wherein a
diamond cutter or other trueing device is carried
on a transversely movable slide adapted to have
imparted
thereto a
reciprocating movement
whereby the cutter is caused to traverse across
the periphery of the grinding or the control
wheel to effect the trueing of same, and wherein
saidslide is carried on a longitudinally movable
slide to provide adjustment and infeed of the cut
ter, means are provided whereby the grinding
40 and/or control wheel can be automatically trued
to any desired shape conforming with the shape
of the cylindrical body to be ground, charac
terized by the provision and use of a pair of
formers, a tracer arranged for engagement with
' ‘either of the formers,‘ and spring loaded means
whereby avformer and the tracer. are held in
Figure 4 shows, on‘a further enlarged scale,
on line A_--A, Figure 5.
i
I
Figure 5 shows a side elevation of the form
trueing mechanism in conjunction with manually
operable means adapted to assist the action of the
former in imparting movement to the slide.
Figures 6 and 6a, respectively, are a plan view
and an end elevation of one convenient arrange
ment of former.
Figure '7 is a longitudinal sectional view
through the diamond holder structure.
'
Figure 8 is a cross section taken on the plane
of line 8—8 of Figure '7; and
'
Figures 9 and 10 show respectively a part sec
tional side elevation and a plan view of a modified
construction of form trueing mechanism.
Figure 11 is a plan view of the tracer bar.
‘According to one practical mode of carrying
the invention into effect, as illustrated in Figures
1 to 5, I mount on the lower part of a transversely
movable slide I carrying the holder 2 for a dia
mond or other trueing element 2a, a pair of‘form
ers 3 and 4, one being adapted for the form trueing
tudinal and sideway movement is imparted to the
of the periphery of the grinding wheel 5 and the
other for the control wheel 6. A longitudinally
movable slide is employed at ‘I. Said slides I
50 cutter, said movement conforming with the shape
and l are mounted or supported in a manner
or form of the cylindrical body desired to be
common in machine tool design, that is, slide 1, as
best seen in Figure 2, has a longitudinal dove~tail
slot lh engaged with a correspondingly formed
operative contact during the traversing move
ment of the cutter whereby a combined longi
ground.
The invention also consists in means where
Q by the spring which controls the movement of the
$5 slide and holds the former in operative contact
20
slide member ii carried by an angularly adjust
able bracket 8, while slide 1, as best shown in
25
2
2,117,979
Figure 4, has a dove-tail slide means 1): engaged
in a correspondingly formed slot ‘Ii in the hood
or cover I4 of the aforesaid control wheel 5. _In
a longitudinal slot 1a formed in said slide ‘I is
mounted a rectangular bar 9 which carries at its
front end a tracer 9’ provided with a nose or pro
jection III. In the rear end of said bar 9 is mount
ed an adjusting screw‘ H which is longitudinally
con?ned in an open ended slot I2 formed in one
H) end of a block member I3 slidably attached to the
hood as seen in Fig. 4. Said adjusting screw I I is
reduced in diameter by means of a circumferen
tial groove I5 arranged to engage the said slot I2
as seen in Figs. 2 and 3. The said block member
I3 is further adapted to be released and moved
clear of engagement with the said adjusting screw
II to permit of withdrawal of the tracer bar 9,
to allow of the turning of the tracer to a posi
tion for engagement with the other former. The
20 said formers 3 and 4 are mounted and disposed in
a. recess 30 in the lower part of the movable slide I
one above the other, and as previously stated, one
is adapted for the trueing of the grinding wheel
5, and the other for trueing the control wheel 5.
25
9 that by removal of the latter and a half turn
ing movement before replacing same, its nose or
projection III will be brought into alignment with
the other former.
The rear end of the tracer bar 9 is bored at
9b to receive the rotatable but longitudinally
con?ned adjusting screw I I, and a vertical open
ing I6 is formed in said bar 9 in which is located
and non-rotatably housed a nut Il engaged by
the said adjusting screw II, which latter, upon 10
being rotated, will impart a sliding movement to
the tracer bar 9 for the purpose of adjusting the
nose or projection II) in relation to either of the
formers 3 or 4. If desired, the tracer bar 9 may
be slotted at 9a to lighten same and provide a 15
passage for the inner end of screw II.
In order to allow of the ready removal of the
tracer bar 9, to permit of the turning of the
tracer 9' for the purpose previously described,
the member I3, in which is formed the open ended 20
slot I2 arranged to engage with the circumferen
tial groove I5 in the adjusting screw II, is slid
ably carried on the bracket I3 secured to the end
of the hood or cover I4 of the control wheel, the
In the arrangement illustrated, as seen in Fig
said member I3 being ?xed in its operative posi
ure 2, the tracer 9' is arranged for its nose or
tion by a bolt 20 engaging with a slot 2I formed
projection III to engage with the upper former 3,
and the diamond holder 2 is moved or turned to
the position for the trueing of the control wheel
30 6. In Figure 1 the tracer 9' is shown turned to
in said member, so that by releasing the said
bolt 20 and sliding the member I3 sideways, it
is freed from engagement with the adjusting
screw I I of the tracer bar 9 and the latter can 30
the position for engagement with the lower form
then be withdrawn to permit of the tracer being
er 4, and the diamond holder 2 in the position
turned to bring its nose or projection III into
for trueing the grinding wheel 5.
The diamond holder 2 (Figs. 7 and 8) is
alignment with the second former, or for the
purpose of substituting another shape or form
of tracer, such as one provided with a different
35 mounted in a cylindrical housing 50 on the front
part of the transversely movable slide I, in
which it is capable of being adjusted vertically
and also turned to bring the diamond tool into a
position for contact with the grinding wheel 5
40 or the control wheel 6.
In the stem part 5| of
the diamond holder on opposite sides thereof,
are formed longitudinal slots 52 and 53, adapted
to be engaged by a bolt 54, screw-threaded in
housing 50, and on the upper part of the said
stem part 5| is formed a screw-thread 56 en
gaged by a nut 55.
Nut 55 is carried by a tubular head 51 swivelled
at 58 in the housing 50 and operable manually
through the aid of a device 59 which also func
tions for rigidly clamping the diamond holder
in either position to which it may be turned or
adjusted.
shape of nose or projection I0.
'
The means whereby the longitudinally mov
able slide ‘I is spring loaded for the purpose of
holding the formers 3 or 4 in sliding engagement
with the tracer, in a convenient arrangement 40
comprises an adjusting screw 23 engaging with
a nut 24 mounted in a lug or bracket 25 formed
or ?xed on the underside of said slide, the said
screw 23 having ?tted thereto a rotatable but
longitudinally con?ned plain sleeve part 28 which
is slidably carried in the bracket I8 ?xed to the
hood or cover I4 of the control wheel 6, and be
tween the said bracket I 3 and a ?xed collar 23
mounted on the outer end of the aforesaid ad
justing screw 23 is located a compression spring
29 which normally tends to move the slide ‘I and
hold either of the formers 3 or 4 in engagement
When it is desired to turn the diamond tool with the ?xed tracer 9'.
through 180 degrees to move it from the position
Means are provided whereby the aforesaid ad
55 for contact with say the grinding wheel 5 to the
justing screw 23 can be clamped to its bracket
position for contact with the control wheel 5,
I8 and prevented from longitudinal movement,
the bolt 54 is first withdrawn from engagement thus making inoperative its spring 29, as for in
with the slot 52, thus permitting of the diamond stance when it is desired to dispense with the use
holder being given a half turn bringing the other of the formers 3 and 4, and employ the trueing
slot 53 into alignment with the bolt 54, which can device 2a for the producing or trueing of a
then be moved into engagement with said slot 53. 1 straight face on the,periphery of the grinding
The groove 5Ia around the stem part 5| is wheel 5 or the control wheel’ 5. In the ?xed
provided for ease in the manufacture of this part. bracket I8, as seen in Figure 4, is mounted a
In order to make the tracer adaptable for en
clamping_pad or sleeve 30 actuated by a suitable
65 gagement with either one of the formers 3 and
knob or nut 3I engaging with a screw-threaded
4, which are disposed one above the other, the stem part 32 of the said clamping pad, whereby
nose or projection III of the tracer 9"is disposed it can be made to grip the sleeve 26 in which the
eccentric to or out of centre with its attachment
adjusting screw 23 is rotatably carried and longi
stem 22, as seen in Figures 1 and 2, so that by tudinally con?ned, and thus prevent the spring
70 a half turning movement of the tracer 9', after 29 imparting movement to the slide ‘I, but in this
removal of the tracer bar 9, its nose-or projec
position, rotation of the adjusting screw 23 is
tion III can be brought into alignment with the
adapted to impart movement to the slide ‘I for
\other'former. Alternatively, the tracer 9' may adjustment of the diamond cutter 2a when em
be ?xed and its nose or projection III so dis
posed in relation to the centre of the tracer bar
25
55
60
65
70
ployed for straight trueing of the grinding wheel
5 and control wheel 6.
The screw 23 is also 75
3
2,117,079
the spring 29 in moving the slide ‘I when a steep
The tracer bar 9 and its adjusting screw II
are again re-assembled and ?xed in operative
position by inward movement of the block I3
mounted on the ?xed bracket’ I9, into engage
ment with the groove I5 in the adjusting screw
II. The diamond tool holder 2 is given a half
angle on one of the formers 3 or 4 is ‘being
negotiated by the tracer, which in one convenient
arrangement, as seen in Figures 4 and 5, com
prise the provision of a rack and pinion device,
the position facing the control wheel 6, and is
then moved into contact therewith as shown in
Fig. 2, and the spring 29 is then tensioned or 10
adapted when clamped and prevented from lon
gitudinal movement to serve for positioning the
diamond tool holder 2 in relation to the periphery
of the grinding or the control wheel.
Means are provided to augment the effort of
‘ wherein the rack 33 is mounted on the, edge of
the slide 1 and engaged by a pinion 34 pivoted
to the side of the hood or cover I4 of the control
wheel 5 and provided with a hand lever 35 or
15 other suitable operating means.
The mode of operation is as follows: Assuming
it is desired to shape the periphery of the grind
ing wheel 5 to any desired configuration conform
ing to» the shape of the body to be ground, the
20 diamond holder 2 is adapted to be turned so that
loaded in the manner as previously described.
During the process of shaping ortruing the
periphery of the control wheel 6, the dressing tool
2a can be advanced as required by turning the
adjusting screw I I in a clock-wise direction, when 15,
it has a right hand screw thereon, but when
shaping or truing-the grinding ,wheel 5, it will be
readily understood that the said adjusting screw
II has to be turned in an opposite or anti-clock
wise direction. The screw thread of screw II may 20
the diamond or like tool 2a may assume a posi
tion facing either the grinding wheel 5 or the
be either right or lift hand.
control wheel 6 and adjusted vertically if neces
shown in Figures 9 and 10, the transversely mov
able slide Ia carrying the diamond tool holder 2a
is mounted on the front part 36 of a longitudi
sary.
The adjusting screw 23 is first prevented from
longitudinal movement by turning the clamping
nut II whereby the clamping pad 30 is caused to
grip the sleeve part 26 which is longitudinally con
‘ fined on said screw.
A turning movement of the
30 adjusting screw 23 will then bring the dressing
tool into contact with the periphery of the grind
ing wheel 5. The tracer bar 9, which may have
,
p
In the modi?ed construction and arrangement
nally movable slide 31 mounted on an angularly
adjustable bracket 38 attached to the upper face
‘of a lower longitudinally movable slide 1a
mounted on the control wheelhead “a. The'
angularly adjustable bracket 38 is attached to
- the slide ‘Ia. by a pivot 39 and is ?xed to the slide
with the nut I'l, non-rotatably housed in said bar,
1a by a clamping bolt 49 fixed to the said bracket
and engaging with a segmental slot H in the end
of the slide ‘Ia. When the formers 3a and 4a are
employed for the automatic trueing of the grind
to bring the tracer 9 at ‘nose or projection III
into contact with the former 4, which is of a'
shape corresponding to the desired shape of the
bracket 38 is moved to and ?xed in a central
position, as seen in Figure 10, against a stop 42
been previously retracted, is then adjusted by
turning the adjusting screw II which engages
grinding wheel 5. The damping nut 3| is then
40 turned to release the clamping pad 39 and permit
of inward longitudinal movement of the sleeve 26
and the adjusting screw 23, when the latter is
turned, whereby the spring 29 may be loaded or
compressed to any desired degree, for the pur
pose of imparting an inward and outward move
ment to the slide 1, when a transverse movement
‘is imparted to the slide I carrying the diamond‘
tool holder 2, by any known means, ‘in the'op
eration of dressing or truing of the wheel 5, such
as a feed screw housed in the bracket part 8,
engaging with a nut on the slide I, the said screw
being rotated by a handle orv other means. In
the process of shaping the periphery of the grind
ing wheel 5, during the transverse movement of
the dressing tool 2a, it will be readily understood
that as the former 4 passes over the nose III, the
said parts are held in sliding contact under the
in?uence of the spring 29, which causes the slide
1 to have imparted thereto, during the transverse
60 movement of the slide I and diamond holder 2,
a slight backward and forward longitudinal move
ment according to the shape of the former‘ 4.
When it is desired to‘shape the periphery of
the control wheel 6, the tracer bar 9 is removed
65
turn movement to bring the dressing tool 2a into 4
by ?rst slackening the bolt 29, shown in Figs. 3
and 4, which permits of the block I3 being moved
sideways to withdraw the slot I2 therein from
engagement with the circumferential groove I5
formed in the adjusting screw I I, thus permitting
of the complete withdrawal of the tracer bar 9.
‘The tracer 9 is then given a half turn movement
which brings its nose I0 into alignment for en
gagement with the upper former 3, which is of
such shape that it is desired, to form the periph
75 ery of the control wheel or wheels 6.
ing or the control wheel, the angularly adjustable
(Fig. 10)‘, in which position it is securely fixed
by the clamping nut 43. The angular adjust 40
ment of the bracket 38 is only intended for use
in known manner when it is desired to cut a
straight taper or an inclined face on the grind
ing or the control wheel 6a, without the use of
the formers 3a and 4a.
45
‘The formers 3a and 4a are mounted on the
upper rear part of the transversely movable slide
Ia. On a lug or projection 39a on the angularly
adjustable bracket 38 is mounted an attachment
plate 44, in which is carried a tracer provided I"
with a nose or projection Ilia disposed eccentric
to or out of centre with its attachment stem 22a
so that ‘a half turn movement of the tracer will
bring its nose or projection I9a into alignment
with either one of the formers 3a or 4a. On the
inner face of the head of the tracer is formed a
rib or register 45 arranged to engage with a cor
responding slot or gap formed in the front face
of the attachment plate 44 in which it is held in
engagement by the clamping nut 46 mounted on 60
the screw-threaded outer end of the stem part
22a of the tracer.
I
In the arrangement illustrated in Figures 9 and
10, the nose or projection Illa of the tracer is
shown engaging with the lower former 4a, and the
diamond holder 2a is shown turned to the po
sition for the diamond or like tool being used for
trueing or‘shaping the periphery of the control
wheel, So. ‘It will be readily understood that
when it is desired to true or alter the shape of 70
the periphery of the grinding wheel, it is simply
necessary to slacken the clamping nut 46, which
permits of the tracer being moved forward to re
lease its rib or register 45 from engagement with
its slot in the attachment plate 44, when a half
2,117,979
turn movement will bring its nose or projection
Ina into alignment with the upper former 3a,
in which position it can then be securely ?xed
by means of the clamping nut 46, ready for the
trueing or shaping of the grinding wheel, after
I having given a half turn movement to the dia
mond tool In.
The means whereby the nose or projection lid
of the tracer is held in operative contact with
10 either one of the formers 3a or 4a during the
longitudinal traversing movement of the cutter,
whereby the latter has-imparted thereto a com
bined longitudinal and sideway movement, in the
modi?ed construction, comprises a loading spring
15 29a located between the lug 38a on the angularly
adjustable bracket 38 fixed to the slide ‘Ia, and
a bearing sleeve 41 mounted in the outer end of
the slide 31 which has mounted on its front part
36 the transversely movable slide la. The bracket
20 48 and the slide 31 are connected by an adjust
ing screw 23a engaging with a nut 24a non
rotatably housed in a vertical slot formed in the
said bracket 38, the said screw having ?tted
rotatably thereon a plain sleeve part 26a which is
25 longitudinally ?xed between a collar formed on
the screw and a collar 28a mounted on the outer
end thereof, the said sleeve 26a being adapted to
slidably engage with the bearing sleeve 4'! ?xed
in the upper slide 31.
30
‘
Means are provided whereby the aforesaid ad
justing screw 23a can be clamped to the slide 31
and prevented from longitudinal movement in
relation thereto, thus making inoperative the
spring 29a, when it is desired to dispense with
the use of the formers 3a, or ‘4a and employ the
trueing device for producing or trueing a straight
face on the periphery of the grinding or the con
trol wheel, said means in one convenient arrange
ment comprising a clamping pad or sleeve 30a,
like that at 30, mounted in a slot formed in the
upper slide 31, and arranged to grip the sleeve
26a, said pad being provided with a screw
threaded stem part 32a, and a clamping nut 3la.
When the said sleeve 26a is clamped and pre
45 vented from longitudinal movement, rotation of
the adjusting screw 23a will impart movement to
the upper slide 31, together with the transverse
slide la, thus separating the formers from the
tracer to permit of removal or replacement of
60 said formers, or allow of the reversing of the po
sition of the tracer from its position in align
ment with the one former to the position for en
gagement with the other former, and further to
hold the tracer and former separated, when it is
55 desired to use the trueing mechanism for trueing
or forming a straight face on the periphery of
the grinding or the control wheel.
In a plate 48 attached to the control wheel
head i4a is mounted a rotatable and longitudi
60 nally con?ned infeed screw 49 engaging with a
nut 50 non-rotatably mounted'in a bracket 5| at
tached to the underside of the slide 1a. The
said infeed screw 49 is adapted for use in posi
tioning the diamond holder 2a and its cutter in
65 relation to the peripheries of either the grinding
or the control wheels, and for applying the
requisite feed movement to the cutter in the op
eration of trueing or shaping the wheels.
The mode of operation of the modi?ed device
70 shown in Figures 9-and 10 is as follows: In the
75
arrangement illustrated, the diamond tool holder
2a is turned to the position for shaping or tru
ing the control wheel 6a, while the tracer Illa
is shown in engagement‘with the lower former
4a, under the in?uence of the spring 29a. In
this arrangement the lower former 4a is of a
shape corresponding to the desired shape of the
control wheel in. By rotation of the adjusting
screw 49, the tool is brought into contact with
the control wheel 6.
When it is desired to shape
5
or true the grinding wheel, the diamond tool
holder 2a is given a half turn movement, so that
the cutter then faces the said grinding wheel.
The adjusting screw 23a is then longitudinally
con?ned on the slide 31 by means of the clamp
ing nut Sid and pad 30a engaging the sleeve part
26a, so that by a turning movement of the said
screw 23a, the tracer Ina can be retracted from.
engagement with the former 4a a sufficient dis
tance to permit of a half turn movement being
given to the tracer Ilia by first slackening the
nut 46, which permits of the tracer being moved
forward to release its rib or ‘register 45, and then '
turned to bring its nose or projection 2a into'
alignment with the upper former 3a, which cor 20
responds in shape to the shape it is desired to
form on the periphery of the grinding wheel.
When the clamping bolt 3la is released, the
spring 29a will cause the slide 31 to move forward
and bring the tracer Illa into operative engage
ment with the former 3a, the said parts being
held in sliding contact, during transverse move
ment of the slide i a, under the in?uence of the
spring 29a, in the manner as previously described.
In the operation of truing or shaping the grind 30
‘ing wheel and the control wheel'Ga, the adjust
ment of the cut of the tool 2a can be effected by
rotation of the adjusting screw 49."
What is claimed is:
1. In combination with a grinding machine
having a grinding wheel and an associated control
.
wheel, a truing device for said wheels, a slide re
ciprocable transversely ‘with respect to the pe
riphery of said wheels, means to adjustably mount
and position said truing device on said slide to
coact with either of said wheels, means provid
ing former surfaces on said slide one individual
to each of said wheels, a tracer, means adjustably
mounting the tracer in relatively ?xed relation to
the slide for engagement with said former sur
faces individually, and means to maintain fol
lowing contact of the tracer with the adjacent
former surface during movement of the slide.
.2. In combination with a grinding machine
having a grinding wheel and an associated con 50
trol wheel, a truing device for said wheels, a slide
reciprocable transversely with respect to the pe
riphery of said wheels, means to ,adjustably
mount and position said truing device on said
slide to coact with either of said wheels, means 55
providing former surfaces on said slide one in
dividual to each of said wheels, a tracer, means
,adjustably mounting the tracer in relatively fixed
relation to the slide for engagement with said
former surfaces individually, and spring-loaded
means maintaining contact of the tracer with the
adjacent former surface during movement of
the slide.
3. In combination with a grinding machine
having a grinding wheel and an associated con 65
trol wheel, a truing device for said wheels, a slide
reciprocable transversely with respect to the pe
riphery of said wheels, means to adjustably mount
and position said truing device on said slide to
coact with either of said wheels, a pair of form 70
ers on said slide one individual to each of said
wheels, a tracer, means adjustably mounting
the tracer in relatively fixed relation to the slide
for engagement with said former surfaces in
dividually, and means to maintain following con 75
2,117,970
tact of the tracer with the adjacent former sur
face during movement of the slide.
4'. In combination with a grinding machine
having a grinding wheel and an associated con
trol wheel, a truing device for said wheels, a slide
to the slide for engagement at different eleva
tions with said former surfaces individually, and
means to maintain following contact of the tracer
with the adjacent former surface during move
reciprocable transversely with respect to the pe
‘7; In combination with a grinding machin
having a grinding wheel and an associated con
trol wheel, a truing device for said wheels, a
‘ riphery of said wheels, means in adjustably mount
and position said truing device on said slide to
coact with either of said wheels, a pair of super
10 posed formers on said slide ‘one individual to each
of said wheels, a tracer, means adjustably
mounting the tracer in relatively fixed relation
to the slide for engagement with said former sur
faces individually, and means to maintain ,fol
15 lowing contact of the tracer with the-adjacent
former surface during movement of the slide.
5. In combination with a grinding machine
having a grinding wheel and an associated con
trol ‘wheel, a truing device for said wheels, a slide
reciprocable transversely with respect to the pe
riphery of said wheels, means to adjustably mount
and position said truing device on said slide to
coact with either of said wheels, means providing
former surfaces on said slide one individual to
each of said wheels, a tracer, means adjustably
mounting the tracer in relatively fixed relation
to the slide for engagement with said former sur
faces individually, means to maintain following
contact of the tracer with the adjacent former
surface during movement of the slide, and means
operable to maintain the tracer retracted so as to
I be unaffected by either former surface.
6. In combination with‘a grinding machine
having a vgrinding wheel and an associated con
trol wheel, a truing device for said wheels, a slide
reciprocable transversely with respect to the pe
riphery of said wheels, means to adjustably
mount and position said truing device on said
slide to coact with either of said wheels, means
providing former surfaces on said slide one in
dividual to each of said wheels, a tracer, means
adiustably mounting the tracer for variation of
its angular position in relatively ?xed relation
ment of the slide.
v
_
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slide reciprocable transversely with respect to the
periphery of said wheels, a body mounting said 10
slide, supporting means for the body, means to
rotatably mount said truing device on said slide
to coact with either of said wheels, a pair of
superposed formers on said slide one individual
toeach of said wheels, a tracer structure on said
support for engagement with said formers in
dividually, spring means to maintain contact of
the tracer structure with the adjacent former
duringtransverse movement of the slide, screw
means on the support and engaged with the body
operable to adjust the position of the body, and
screw ‘means on the support and engaged with
the tracer structure to adjust the position of the
latter.
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‘
8. In combination with a grinding machine
having a grinding wheel and an associated con
trol wheel, a truing device for said wheels, av slide
reciprocable transversely with respect to the pe
riphery of said wheels, means to adjustably mount
and position said truing device onmsaid slide to
coact with either of said wheels, means providing
former surfaces on said slide one individual to
each of said wheels, a tracer, means adjustably
mounting the tracer in relatively ?xed relation
to the slide for engagement with said former sur
faces individually, means to maintain following
contact of the tracer with the adjacent former
surface during movement of the slide, and rack
and pinion means operable manually to impart
movement to the slide when the tracer passes a
steep angle on a former surface.
WILLIAM OGILVIE.
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