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Патент USA US2404148

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July 16, 1946.
Filed Aug. 5, 1944
3 Sheets-Sheet 1
July 16, 1946.
- 2,404,148
Y Filed Aug. 5, 1944
3 Sheets-Sheet 2
July 16. 1946»
Filed Aug. 5, 1944
3 Sheets-Sheet 3
/0/ ‘9;
Patented July 16, i946
_ GRlNDING WHEEL ,in'inssna I
Richard ‘A. Thompson], etroi‘t;
Colonial‘ Broa‘ch Com pany,‘~
' corporation of Delaware
assignorto ‘ i
Detroit,'~ Mich.) 5a
V. Application August 5', 1944,.saaigqgisitif .
4‘Claims.”r(Cl. 125-11)‘ I
_Thefpresent ‘invention relates to a grinding‘
2 >
wheel dre'sse'r'adapted to dress arcuate surfaces or
Referring to the drawings, and particularly to
Figures‘l to4 thereof,ithe dresser comprises a base
ery of a grinding wheel. It'is‘p'articularly adapted
plate I adapted to rest on the table of a grind:
inghmachine. The base plate is provided with-a
straight line surfaces at any angle on the periphl
for use in‘dressing the wheels employed in grind‘
splitkey formed by two pairs .of downward pro- _
ing splines or spline broaches, but may be em_-:
ployed for other purposes. ;
jecti‘ons, each pair including projections. _2 and
3 which are formed as depending ?anges on a
The primary object of ‘the invention is ‘to ‘pro
pair'of plates .3 and 4’ respectively,‘ slidable to
videa rugged, accurate,‘ and simple dressing ?x
wardiand from‘ each other in the'bottom of plate
ture adapted‘ to dress awide variety: of wheel 10, I ; The position of plates 3 and 4 is controlled
v Anotherobject of the invention
-, ,‘
is tovprovivde a
by. means of a pair of adjusting screws '5 and 6
dresser of the type mentioned _in_ which allneces:
which. are‘ mounted ‘in countersunk openings in ‘
the, side edges of the plate I and are ‘threaded
into ‘the members 3 and 4 respectively. A pair of
by means of accurate measuring blocks such as '_ 15
cap screws ‘I, indicated in dotted‘lines at the left‘-v
the familiar Johannsen blocks.
‘ H
‘hand side‘ of Figure 2, are .?tte'din suitable slots
Another object of the invention is to, provide a
in the members 3'and lLto retain them against
machine of the type mentioned in which a mini
the bottomsurface of theplate, I, with freedom
mum number of relatively moving parts are em
for sliding’imovement relative to the plate'under
sary adjustments maybe flxedwandndeterminedv
ployed and in which,‘ forany given form‘to be" 20
the’ in?uence of the screws 5 and'6.t The split
dressed, all relatively movable partsv are ?xed
key formedv by the projections 2 and 3 ?ts within‘
against relative motion except. two parts which
the keywayon the table‘ of a grinding machine.
move relatively to effect the ‘desired’ motion of
By adjusting the members 3 and 4 an vaccurate
the dressing» tool.
Another object of the invention is to provide 25 ?t of ‘the key in the keyway may be maintained.
In addition, if the k'eyway becomes‘ Worn it may
a dresser of the type mentioned'in which means
be reground 'to a slightly greater. width by the I
employed’to adjust the location of the toolfor
grinding‘ wheel of the machine, and the split key
dressing straight surfaces is employedto effect
adjusted to .?tthe increased width. This assures
the necessary movement of thetool in ‘dressing
maintenance of the accuratelocation of the fix
curved forms and vice versa, thus increasing the
ture as a Whole with respectitothe plane of the
versatility of the machine without corresponding-Y
ly increasing its complexity. .
plate “II ‘ is provided with a pair‘
.v of
Other objects and advantages of the invention
will become apparent from the following speci?:
upstanding apertured ears .8‘l'and 9 ?tted'respec
tively with bushings I0 and II in which is jour
cation, the accompanying drawings, and’ theap
pended claims.
‘In the drawings;
naled a shaft I2. The shaft is ?xed against rota- ‘ 7
/ "
tion by. means of a setscrew I3, indicated in
, ‘_
dotted lines in Figure 2.
Figure 1 is a vertical section through the fixture
as ‘viewed from the left side.
Figure 2 is a rear elevation of the invention
with portions broken away to show the interior.
, '_ ~
Pivotally mounted uponthe. shaft I2 is a .box
like‘ frame structure‘indicated‘generally at I4.
40 This frame‘ comprises a pair of integral front and
backv walls I5 and I6 joined together at 'their'
Figure 3 is a plan view of the invention.
Figure 4 is a front elevation.
lower' portions by means of a connecting portion
Figure 5 is a fragmentary sectional view taken
of ?anged bushings I9 and Marc ?tted within
on the line 5—5 of Figure 1.
Figure 6 is a fragmentary section taken on the‘
line 6-6 of Figure 1, showing the means for look
ing the dressing tool slide relative to the rotaryv
support therefor.
I‘! in which islformed a transverse bore I8. . A pair:
v ,
thebore I8 and‘are ‘rotatably .J'Qurnaled on the
' shaft I2. I Apaifof spacing’, discs 2| and‘22 form
an axial; thrustjbeari'n’g forgthe assembly,. and
consequentlyaccurately locate the axial position
_ .
. "
Figure '7 is a diagrammatic illustration of one 50 of'the frame III on the shaft I2.
Above the connecting vportion ll of the frame
form of spline grinding
wheel which ymay bev 7‘ ' I4'the frame is‘vprovided’ with a pair of side wall
dressed by the invention.
members >2_3"an‘d1-2'II indicated in dotted lines in
Figure8 ‘is a diagrammatic view'of a second
Figuregiljand 3‘ and, also shown in sectioninrrFi'g
form of spline grinding wheel which may be
dressed by the. present invention,
55 ure..5'.§ The side wall members 23_and ninete
cllféd' to the 'front‘a?dbjack 0f memberslby means
' 511»
the auxiliary slide 55.’ The wedge member 60 is
of countersunk cap screws 25,-shown best in Fig
?xed to the end of a rod 6 I , which extends through
ure 2, to form a rigid structure.
the tubular spindle 4| and is provided with a pro‘
jecting threaded extremity carrying a thumb nut
'52. A s a result of this arrangement tightening
' of the wall members
The upper ends
|5, H5, 23, and 24 are secured
by similar cap ‘screws 26 to a top plate 721. A
generally rectangular block-shaped ‘slide 28
' of the nut 62 will lock the auxiliary slide 55
?tted between the walls l5, I6, 23, and 24, and is
' againstt radialgvmovement, with respect, to the axis
slidable vertically therein, such slidingv movement
oiiiheiubulal: spindle “1-. - j - ;
., .
being eife‘ctedwb-y means; of a handle 2,9_ fixedotob
The auxiliary slide 55 carries the dressing tool
the end Qfa double screw 30. The screw 30 has
which’ may be in the form of a pointed diamond.
an upper portion’ 3| provided with a left-hand’v 19;.
" The
diamond’ may be mounted in any suitable
thread and a lower portion 32 witha right-hand
. mannerg'lbut two alternative mountings are illus
threaded-through >
thread. The upper portion is
.Ttrjatediu the, drawings 7 One of the illustrated’
a threaded bushing 33 ‘?xed tothe top plate; 21,
diamon jholdefsfisin the form of a generally
While the lower portion 32 isjthiiéwidédwithinl a v I
' threaded bushing 34'?xed to the slide 28.
’ Haired, 63:;having a stem 64 accurately
. ’ enter
?tted within. a suitable bore within the auxiliary
consequence of this arrangement vrotation ‘ofthe
slidev 55 and extending parallel to the axis of the
handle moves the slide vertically Within the frame ' l'
The stem 64 is provided with
M in either direction.
»_ tubular-spindle 4|.
.a notch 65 adapted to receive a sets'crew 66 for‘ ‘
The slide 28 is provided with a circular'o-pening
35. extending parallel to ‘the axis of the shaft 1.2
lockinglthe holder inposition. The holderis also
PIiOViQQd'iWith 2» flange 61 having 2», depending-P0P.
tionf?iifwhich,‘ as best‘ shown in Figure ‘l, ?ts‘
and adapted to receivea tubej36u The tube 36. is
keyed'torthe slide 28, by means ‘of akey, 31 which Lwit'hinja keyway 59in the auxiliary slide and: thus '
isflocked in position by means ‘of a setscrew 38."
?xeethe rotati'ye‘position of the ‘holder relative
The rearwall I5 of the frame is provided with a
theslida Thediamond point"), in accord
and the front wall I?is provided
ance with conventional practice, is ?xed to a
» 'vertical'slot as,
with a similar slot 49 through which slots the tube ' cylindrical element‘ it which" in turn 'is ?tted
3&6 projects freely. The slots are of su?icient
' within a transverse opening in‘ the holder 63
length to'permit the maximum‘verticalmovement
of the slide 28 relative to the frame l4 without’
The tubular. stem 4|, of a rotary support 4; is
and lockedin; position by means of/avlong set- '
screw 12 shown'nin dotted-lines in Figure 1'. ‘ The "
30 opening in which the element 1| is mounted ex:
tends» ‘parallel’ to the dove-tailed tongue and
groove connectionbetween the auxiliary slide 55
journaled within the tube 35‘ for rotary move-'
, ment
on an axis parallel to the shaft l2 under
and-therotary support 4-2.~ If - desired,'a second
the influence of a crank 43 keyed to a reduced
7 extension 44 or. the tube stem 4|.
is ?xed to ‘the tube 35 by'means of alkey 46, and‘
‘diamond 13' may be‘; similarly mounted further
out on the holder 631 for use» in connection with
grinding wheels» oil larger diameter. It will be
a similar disc 41 is hired to the tubular stem 4| '
understood’v that only» one diamond will be eln-j
by means of keyways 48 and a lock nut 49
threaded on the reduced portion 44 of the stem‘ _.
ployed at onetime.
41; The disc 41 is provided,‘ withan accurately
formed, hole 50,, and the disc 45'is provided with
four. similar holes, 5| spaced 90° apart around
slide 55‘ and.screwf55ji'arsecond diamond holder
distance from the axis of the tubular spindle4|
- than does the1holder36'3. This'lholder, as ‘shown in
other and parallel to the, path of movement of
the‘ slide 28..‘ The holes 50 and 5| are adapted
Figure 1, comprises a- bracket 14' ?xed to the aux- '
' iliary slide 55 by means of a key'l5 and cap screws
to‘ have a, push ?t with a bushing 52 ?xed on a
it is. i
pin 53, having. a handle 54. As a result,
36 in any oneof four“
' '
is provided which-positions'a- diamond ata greater
45 being vertically positioned‘ relative to each
port '42'relative to the tube
J'ustment of" the diamondv point by 7 the auxiliary
the disc, ‘the upper and lower holes 5| in the disc
possibleto ?x; the rotative position of the sup-v
_ In Vorder'to increase; the effective range'oi ad‘
16; "It carries a diamond holding element '|'| pro
vided'with a diamond point 18. Theelement ‘His
locked iniposition by means of a set screw 19p It '
willibe observed that by rotating the spindle 4|
positions spaced '90?’ apart. When thepin 53’is'
removed it will be obvious that the support is
‘ through an angle of 180° that'the diamond ‘Hi-may
freely rotatable relative to the tube 36. n
. the» diamonds
be swung into the angular position occupied by
10* andi'l3, but will‘ be spaced at a
greater distance than the latter from theraxis of
An' auxiliary slide 55 is mounted upon the re
tary ‘support 42 by means of the tongue. and
groove connection shown best in dotted. lines} in
the tubular spindle 4|.
Figure 3, with the result that the auxiliary slide
.may move radially with'respect V to
spindle 4|.. This
the axisyof the
is accomplished by;
meanss‘of a doublescrew 56 having a portion 51 .
The diamond holder 63 is sov positioned on the
at its upper end'provided with a left-hand thread
and a‘portion 58 at the lower ‘end provided with a.
right-hand thread. The portion 51 is threaded
in a'blockn 59 ?xed to the upper end of the auxil
slide 55 and the diamonds 1b and'13 areso posi
tioned relative to the holder, that. when the sur
face 8|! of the'block 59-contact's the surface 8|_ of
the rotary‘ support 42 the point of the diamond will
be exactly on the axis of-vspindle 4|. As a result,
the radius of movement of the ‘diamond point‘
e?ected by'swinging'thecranlglhandle 43 maybe
exactly determined by inserting measuring blocks
iary, slidej55 while the lower end 58‘ is threaded‘ c5 between‘the surfaces‘Bil "and SI and thereafterg?xe '
I into‘ the rotary support 42. ' As a?result ofi this
inglthe‘ auxiliary slide relative'to the rotary Sup
arrangement rotation .of- the. screw. 56v shifts, the..
port'42 by means of the wedge '50; The distance
radial position of. the?auxiliary slide 55 relative
between the diamond point 18“ and 'theaxes' Qfthe'
. to the axisofthe tubular spindle 4|.
4|f preferably such, that} when. '
'Thejadjusted position or the auxiliary slide55. 70 the surfaces 8!) and -8| arein'contact, the dis
a , wedge-shaped” block 7
may; be ,?xed by, means of
tance between the point 18 ‘and the .axisef; the
tuular spindle
60, shown best. in Figures
spondsngenerally, to , the , shape of ‘the dove-tailed,‘
tOhEU-QQH the. to ‘nary. support 42, and ?tswithinl'l
the central portion of the dove-tailed groove in.
Spindle 4| equals themwsimumdist'ance tolwhich.
diamond point. inmate; shifted seminar; .
75a‘. the
axis by means of the‘ screW'56. Thus; the two
diamond mountings double‘ the effective: range‘ of I
m'ovementof the'auxillary slidei55-5
‘7 I'Ijhe ‘operation of the'imechanism‘ may ; '
understood by ‘reference’, todiagrammatic; Figures '
As best shown'in ‘the broken-away-portion :of
7 and‘8. ' In Figure 17 is illustrated ariragnientiot
Figural-the‘ side wall 23 of the frame ‘I4 is pro-J
vided with an opening 82 through which'may be
a‘ grindingiwheel :I 02 adapted ato‘v f'grindthe space
between apair' of teeth, indicated in- dotted lines; ,
inserted measuring blocks of ‘known dimensions
at’ " I03 and 104;:- of! a ‘straight-‘sided splineifon- ‘
in order to determine the vertical position of the.
splined'fbroach having a @1'001': iradius represented;
slide 28 relative to the “frame "I4. - A pin: 83 is
b'y-ithezkiirc’le ‘1051M In: such a-xcasei the ‘portion A
?xed in the threaded bushing 34 of the s1ide>.28,l
the face 'ofithe. grinding‘ .wheel must be dressed f
and a pin 84 is ?xed to the cover plate 21.1“ These‘ 101
teen arc equal“ to the radius of the circle I05.
pins are so constructedfthat fora known ‘distance
Forsuch: dressing operations the frame I4 is ?xed
between them, which may be determined by. the‘
in *a' verticalpos'ition'in which the rolls 81 and 88
measuring blocks‘,'the distance between’the axes‘
are equal distances'f‘rom the locating blocks‘ 92‘
of ’ the shaft I 2 and the tubular spindle‘ M is
and 93, respectively. This is accomplished; by
known. Consequently the opening 82 and'the pinsv
the use of anaccurate measuring vblock equal to.
83 and‘ 84 provide a' means for accurately-deter
the known'distance between the plane of the_;up-1
per surfaces ofthe blocks 93‘ andlthe axis of shaft
I 2 less’ the radius‘ of the: rolls , 81 and“. The
main slide 28- is then elevated‘ or lowered (by
means of the handle 29 until the axis of the spin-i
dle'4I is on- the'center I05 of the cir'cle- I05.
mining the distance‘between‘ those axes. ‘
As best shown in Figure 2 the frame I4 is pro»
vided with'a pair of ‘triangular boxlikeiproje'cte
ing ears 85 and 85, to each of which is secured a
cylindrical roll 81 and 89, respectively. The/rolls‘
are secured by'cap screws 89 inpos'itionagainst
a pair of accurately located‘surfaces- 90-and ‘9|,
formedonthe ears 85-, which ‘surfaces extend at“
right angles to each other. > The rolls-81' and' 88%
are made'with great accuracy, and by the means
J'ust'described are exactly located so that the _
common plane of their axes contains the ‘axis of
The base plate I is provided at each sideibee
neath ‘the rolls3 8‘! and 88 with a pair of blocks
92 and 93 having accuratelyfor'med topsuriace's
positioned in a commonlplane at an accurately
known distance from the axis of "the shaft I=2'.I3
As best shown in Figure'l, the top‘surfaces ofzthe
blocks 92 and 93 are provided with dust collecting;
grooves in‘ order toi insure *that 9 measurements:
made from- the‘surfaces willinot be impaired'by
any grinding dust which might fall on them. The
This is ‘accomplished by inserting appropriate
measuring blocks between the pins ‘83 and 84
shown in Figure 2 and adjusting theslide untilv
the proper distance between those pins'i-is
achieved. This distance maybe calculated from.
theuknown distance between'theend of- pin I34vv
and the axis of the shaft I2, the known-distance '
between the‘ end of pin 83’and the? axis of spindle
4|, and ‘the known distance between thev axis: of»
shaft I2 and the axis ‘I05? of the workpieceai
auxiliary slide is then ‘adjusted until the ‘distance
between the surfaces 80 andv 8|! isv equal to the“
radius'of the circle I05i Then with the slides“
‘- and 55 ‘clamped, the rotary support“ is oscillated
by' means'o'f’ crank 43 to dress the wheel. ‘ It will
be understood inthis connection that the axis of
the‘ shaft ‘I2 and the tubular spindle 41 are at
r , The '
all timesparallel to they plane of the‘ grinding
rolls 81 and 88 in combination-with the locating 40 wheel,
and that in the dressing of a surface cor-.
blocks 92 and 93 provide a means ‘by ‘which the
responding with surface A in Figure 7 that they
angular position of adjustment of‘the frame I4
are preferably located in the central plane of the
about the axis of- the shaft‘ I2 may be accurately
Pin 53 will be removed during this dress
determined. For any given angle ‘the distance
ing operation in order that spindle 4I may rotate
between one of the rolls and ‘its corresponding do" freely.
locating block maybe readily determined or cal
As angeneral rulegrinding machines for spline‘
culated, and measuring blocks of the proper‘di
grinding maintain the work on a ?xed axis and
mensions inserted between‘ the ‘rolls and the 10‘
consequently-it is not necessary to change the:
cating ‘block to ‘accurately locate the angular po-I
I adjustment‘ of the slide 28 to dress arcs of differ
so" ent radii. It is contemplated that the shop prints
In‘ order to ?x' vtheYframeIIl in‘an‘yladjusted
for the ‘particular workpiecetobe'made will bear
angular position a-cla'mping' meansisprovided as
a notation'of the measuring block settings for
best'shown' in- Figure 5.v As there shown‘, the lower
the distance between the pins 83 and 84, distance 3
portion ll of frame I4 is “providedlwith ai'trans
between the surfaces 80 and 8I,- and the distance“
verse‘bore 94-in'which are slidably ?tted a pair 56 between
the rolls-81 or 88 and‘t-he blocks'92'or 93;:
of plugs 95 and 90; The 5bore 94 intersects the
Consequently, no calculations need to be made
bore I8, and ‘the plugs 95 and-95 are provided with
by the ‘operator of the machine. I
cylindrical surface portions 91- and.‘ 98, respec
tively, adapted to‘?t'against'the'shaft I2. ‘A
socket head screw 99 extends through and is‘
freely rotatable with‘respec't‘ to the plug 96, and
is threaded through the plug 95 with the result
that upon tightening of the screw the plugs will
be drawn‘ together'and clamped against the fixed
shaft I2, thus preventing rotation ofthe frame
relative to the shaft. 'In order to prevent free
movement of the frame about the shaft I2 when
the screw 99 ‘is loosened, the screw is provided
with a nut I00 which is ?xed thereto in any'de
sired'manner, and a‘ spring -IOI- surrounds the
screw and is located between the nut- and the
clockwise direction from the position illustrated»
in the drawings and ?xed in that position by
meansv of pin 53; This results in an inclination
of‘ the. dovetailed ways of slide 55 in a direction
along ‘the, line c,—‘c.v ofFigure 7, with thendiamond»
plug 95. Consequently, when the screw is loosened
the spring maintains sufficient clamping action
tending to draw the plugs together to prevent
the ‘frame from moving by gravity:
~ '
- ~
In order "to dress the’ straight sides‘ B of the
wheel I92 the main frame I4 is swung about the
axis of the shaft I2 until itextendsiat an angle
from the ‘vertical equal'to the angle a between
the pro?le B and the central plane of‘ the wheel.
The center-line of the‘ frame I4 then occupies the
line b’b' ‘shown inlFigure 7, which is parallelto
the line b+b lying in the surface Btobe dressed;
The spindle 4| is then .rotated 90° in a counter
point directed to‘ the leftalong that line as-viewed
in Figure‘ 7. The small slide isithereupon adjust-i
ed by screw 56 untilithe diamond point lies; in
the line ‘be-b; The small slidei-is thenclamped
anemic "
proper angular position ionitheooppositei side of -
bylim'eansl oft 5e trims nut ?liandithe; wheel is
: the‘ frame of therwhe'el; - This position may be de
’ dressed -iby1_rotating:.the: handle '29 "to‘ shift- ‘the ‘
termined by the same’ measuring blocks required
main slideib'achv and forth along the line b'bx;
to ~. locate the angular; position employed at the
V "be
It i will
understood that the setting ofthe
i right side of the wheel as viewed. in Figure 8.
V mainframe on theiangle a maybe determined
with: great accuracy‘ by means‘ of ‘measuring
blocks-‘inserted between thelro‘ll 88 and thelbloick
It'will be observed that there’ is provided; in
accordance! §_With' the, present. invention, arela
tively simple dressing ,device of rugged construe;
"93. r The thickness ofrth'e measuring blocks may 7
tion in which all adjustments may
' be "readily
calculated or. determinedifrom ordi 10' with ‘great (accuracy * by’ means
nary trigonometric tables and the knowrrdimen
'sions of. the dresser. Likewise the, setting of the
auxiliary slide 55 may be accurately calculated-to
be determined
of measuring
' blocks, “In addition}:
it will‘rbe noted that the de
vice is: flexible incapacity to; dress various ar
rangements? of straight or arcuate pro?les_-, but
_ determine‘ thelaccurate‘ thicknesses of the meas
that such: ?exibility is ‘not achieved by additional
uring blocks to’ insert between the'surfaces LB!) and" f complication of the mechanism, vThus, the rotary
8 l l in orderto" insure thatv the diamond point will. 15 movement. of the diamond provided by the pivotal
‘mounting of spindle M is employed to‘ perform the‘
be upon the line 6-4) ‘of Figure‘ '7- ‘duri-ng the
dressing operation. It will be understood that
dressing operation in the case of arcuate pro?les
the‘ angular position‘ of the»
g frame ,I 4' will be: ?xed
' by'tightening the clamping blocks 95 an‘d‘tt of
Figure 5 prior to the dressing’ operation.
'It will‘. be appreciated that" in order to
andqis‘ employed to adjustthe diamond into a
pos'ition at right angles to the surface to be
dressed when dressing straight pro?les. The
sliding movement of the small slide 55- is-gutilized
thefstraight surface on the opposite side oft-he
wheel it will'onlybe necessary to rotate the spin
dle 41 through an angle of 180° from the position
it occupies in dressing the: surface 3, and to
' to'?ix-the radius-in
of the planeof the wheel at the same, butv oppoe,
tact with the; wheel 'in'preparation for the dress’
The main slide'is em_-_
f 'ing. of straightipro?les,
ployed to position thespindle 4| on the center
,of an arcuate-ppro?lewand- is employed to, effect
the rectilinear dressing movement in dressing» a
25 ;
swing themain-frame l4 over to‘ the opposite side
dressing arcuate vprofiles and
' is/employed tov feed the diamond point into com I
Theldresserisaal'so adapted'ito dress arcuate
straightpro?le. Finally,- the swinging movement
sidg'areassuch as thearea.E Con thejwheel I09"
of. the frame 14 is employed to“ locate the axis
ofthe spindle M on- the centerwof an; arcuate
‘ indicated'diagrammatically in Figure 8; Any de-'
sired arrangement of arcuate side surfaces: may
profile to bedressed, and is employed to adjust
be 'dres‘sed,-but,iin, the particular example illus
the plane of movem nt- of the diamond to cor
V trated, C‘ is an arcuate; grinding pro?le which is
3.5; respondv to-the angular position of a straight pro
?le; towbe. dressed, Thus,‘ each’ of the relative
quired to dress the sides ofinvolute splined-teeth '
movements oradjustmentsi- provided in the ma- '
' indicated in ‘dotted ‘lines.’
chine is employed in dressing; both types of pro- j
may be noted that on small splines it ispossible
?les‘ and no additional adjusting means are nec
intended to approximate the involute- form re
involute curve with great ac
essary for either type;
curacy by a true circulararc or, in some cases, 40
7 to approximaterthe
What i'sclaimed is:
_ V
a ‘combination of two tangent arcs of different
radii. The center or centers of‘ such arcs and
l.- A» grinding wheel dresser comprising‘a base,
V ofzv the center
,ofrsuch are, indicated at‘ H0 in
said- second slide with its point projecting in a
direction. parallel to; the path of ‘ movement of the
a frame pivotally connected to the base,‘ a slide
theirradii may be determined by- mathematical
movable‘- on the frame in'a pathv at rightangles
calculation or by laying out the true involute on 45 to the axis» of» said pivotaluoonnection, a. support
a greatly enlarged scale, such as ?fty to ‘one hun
rotatablypmounted on’ said slide on an axisrpar
dred or one hundred to- one, and determining the
allel/to; said ?rst mentioned axisra second slide 7
center location and radius of the proper circular
movable onisaid; support in a path at rightangles
arc-orgarcs graphically; Invv either event, inac
tot-heaxis- of movement of the support relative
corda-nc'e'with the present invention, the location 50 to the ?rst slide, and a dressing tool carried by
Figure 8; is determined with respect to the axis
of the shaft l2 and,in addition, a, determination
secondslide relative torthe support», said basehav
is made'iof the angle at between the central plane
of the wheel and the line b’b' of Figure 8,"which
extends through the center I ID of the arc and the
ing- a flat reference'surface extending parallel to"
55 theaxisi of said frame, and means on sa1d"fr_am'e"
" axis of the shaft i2.
Once this information is determined graphi
cally or by calculation, the‘ frame I4 is pivoted
withlrespect tothe vertical-by the angle a’r which
angular" position, as previously mentioned, is de-r
termined by measuring blocks inserted between
the roll 88- and the‘ block 93.’ _ 'l‘hereup'o'rr the main‘
slide 28' is adjusted along the line b'b‘ until the .
center of the spindle 41 coincides with the. center
H0 of the ar'c'of the radius tolbe‘i'dri'essedl ‘The’
small. slide 55 is then adjusted- by screw Eli-"until
the distance between the surfaces: SOIL-8|‘ equals
the radius of the arc, C,lwhich is-to' bedressed.
This position of, the‘ small slide 55' is ?xed by
means of the thumb nut 62' and the wheel is then
dressed'by swinging the-diamond- point; about the
axis‘ of‘ the spindle M by manipulation of the han
die-43.. The OPPOSltGSidG'Of’thGl wheel may be
dressed in the'same-‘m'amier. without any'adjust
mentieiiceptia shift‘ "of the’ mainframe’ l4‘v to the;
offset» from’ its-axis- de?ning a curved surface
adapted to remain tangent to planes‘ parallel to
said referencesurface, in all- pivotal positions of
, said frame; said reference surface and said means
60 being in juxtaposition to receive between them
measuring blocks for‘ determining the angle of
adjustmentof the» frame relative to the base,
2; A1 grinding wheel- dresser comprising a base,
a frame pivotally connectedrto the base, a slide
movable on the frame in a path at right angles
to- the axis-of said pivotal connection, a support
rotatably mounted on said slide on an axis- par
alleli to: said ?rst’ mentioned axis,v a‘ second slide
movable on said: supportirr a'path at right angles
to‘the axis of movement-of thersupport relativeto
the ?rst slide, and a dressing toolcarried by said
second slide with its point projecting in a direc
tion' parallel to- the path- of movement of the
second slide relative tothe support, said support
and second slide: havingzsurface:portions which,
move toward and from each other and remain in
axis of the support, and said dressing tool being
alignment during movements of the second'slide
relative 'to the support and between which meas
so positioned on said second slide that its Wheel
engaging point is located on the axis of the sup
port when said surface portions contact each
4. A grinding wheel dresser comprisinga base,
uring blocks may be inserted to determine the
adjustment of the dressing tool relative to the
axis of the support.
3. A grinding wheel dresser comprising a base,
a frame pivotally connected to the base, a slide
movable on the frame in a path at right angles to
the axis of said pivotal connection, a support ro
tatably mounted on said slide on an axis parallel '
to said ?rst mentioned axis, a second slide mov
able on said support in a path at right angles to
a frame pivotally connected to the base, a slide
movable on the frame in a path at right angles
to the axis of said pivotal connection, a support
rotatably mounted on said slide on an axis par
allel to said ?rst mentioned axis, a second slide
movable on said support in a path at right angles
to the axis of movement of the support relative
to the ?rst slide, a dressing tool carried by said,
second slide with its point projecting in a dimetion parallel to the path of movement of the
second slide relative to the support, and means
for ?xing the support relative to the ?rst slide
in either of two rotative positions 180° apart, in
the axis of movement of the support relative to
the ?rst slide, and a dressing tool carried by said
second slide with its point projecting in a direc
tion parallel to the path of movement of the sec
ond slide relative to the support, said support
and second slide having surface portions which
move toward and from each other and remain in 20
both of which positions the point of the dressing
alignment during movements of the second slide
tool projects in a plane at right angles to the
relative to the support and between which meas
direction of movement of the ?rst slide relative
uring blocks may be inserted to determine the
to the frame.
adjustment of the dressing tool relative to the
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