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Патент USA US2404613

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'July 23, 1.946 '
` A. G. lBELDEN ETiAL
2,404,613 _
_CRANKSHAFT GRINDING MACHINE
Filed March 2, 1944
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Filed March 2, 1944
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July 23, 1945
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A. G. BELDr-:N ET AL
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Filed March 2, 1944
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CRANKSHAFT GRINDING MACHINE
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July 23, _1946-
A. G. BELDEN ET AL
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GRANKSHAFT‘ GRINDING MACHINE
Filed March 2, 1944
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2,404,613
Patented July 23, 1946
UNITED stares ‘PA-TENT OFFICE _
’
2,404,613
cRANKsHAFT GRINDING MACHINE
Albert G. Belden, Carl G. Flygare, and Oiva E.
Hill, Worcester, Mass., assignors to Norton
Company, Worcester, Mass., a corporation of
Massachusetts
Application March 2, 1944, Serial No. 524,736
14 Claims.,- (Cl. 51-72)
1
further object> of the invention is to provide a
and more particularly to a crankshaft grinding
steadyrest with a graduated scale whereby the
horizontally movable steadyrest shoe may be pre
and regrinding machine for grinding or regrind
ing the crankpins and main bearings of a crank
shaft.
cisely positioned for locating a crankpin of a
known diameter in position before the shaft is
clamped in the supporting pot chucks.
Another object of the invention is to provide
the steadyrest with-a visible indicating mecha
nism whereby the concentricity of the crankpin
relative to the axis of rotation kof the supporting
pot chucks may be readily determined. A fur
ther object of the invention is to provide such‘a
gauging apparatus on the steadyrest whereby vis
'
One object of the invention is to provide a sim
ple and thoroughly pr-actical crankshaft grind
ing machine. Another vobject of the invention is
to provide a crank grinding machine in which a
crankshaft may be readily positioned in the ma-f
chine for grinding or regrinding the crankpins
and bearings thereon.
2
crankpin indexing or positioning mechanism. A
This invention relates to grinding machines,
l
Another object of this invention is to provide
adjustably positioned pot chucks for supporting
ible indication may be had of the crankpin as it '
the opposite ends of a crankshaft in which the
pot chucks are provided with a diametric adjust
is ground or reground to indicate the diameter
thereof. Other objects will be in part obvious or
ment whereby the crankshaft to be ground may
be readily positioned for grinding crankpins of
in part pointed out hereinafter.
’
The invention accordingly consists in the fea
a predetermined diameter and throw; Another
object of the invention is to provide an adjust
ably mounted pot chuck for supporting a crankshaft for a grinding operation, in which the pot
chuck is adjustable along a diametric line relative
to its axis of rotation and to provide the pot chuck
tures of construction, combinations of elements,
and arrangements of parts, as will be exemplified
in the structure to be hereinafter described, and
the scope of the application of which will be indi
cated in the following claims.
` with precision means whereby the pot chuck may 25
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_
In the accompanying drawings in which is
be readily adjusted to position the chuck for sup
shown one of various possible embodiments of the
porting a. bearing of a known diameter so that
mechanical features of this invention,
whereby the pot chuck may be adjusted relative
in elevation;
_
Fig. 1 is a front elevation of an improved crank
the crankpin or main bearing to be ground may
shaft grinding machine embodying this inven
be positioned concentric with the axis of rota
'
.
tion of the chuck so as to grind the crankpin to 30 tion;
Fig. 2 is a fragmentary cross section, on an en
the desired diameter and throw.
larged scale, taken approximately on the line
A further object of the invention is to provide
2_2 of Fig. vl, showing the headstock pot chuck
a pot chuck having a. diametric adjustment
grinding crankpins of desired throws and in
through theheadstock pot chuck;
v
Fig. 4 is a fragmentary sectional View, on an
which the chuck is also provided with a lateral
or transverse adjustment substantially normal
to the diametric adjustment to facilitate posi
tioning the pot chuck for supporting a crank
shaftY with its axis coinciding with the yaxis vof
enlarged scale, taken approximately on the line..
4-4 of Fig. 2, through the pot chuck locating
40
rotation of the pot chuck for grinding the main
bearings of the crankshaft.
I
Fig. 3 is a fragmentary vertical sectional View,
taken approximately on the line 3-3 of Fig.'2,
to the axis of rotation of the chuck to facilitate
e
Another object of the invention is to provide
a pot chuck having a clamping strap to hold 45
the Work piece in position in which the fulcrum
plunger; Y
_
Fig. 5 is a horizontal sectional view, on a re
duced scale, taken approximately on the line 5--5
of Fig. 2, ‘showing the drive for the headstock
pot chuck;
>
.
Fig. 6 is a fragmentary elevation of the head
stock pot chuck, as shown in Fig. 3;
point for the clamping strap is adjustably sup
Fig. 7 is a fragmentary plan view of the foot
ported. Another object of the invention is to
stock pot chuck;
f
provide a clamping strap having an adjustable
Fig. 8 _is a fragmentary >vertical sectional view,
pivot point with means for inverting the posi 50 on an enlarged scale, taken approximately on the
tion of the strap so as to accommodateV either
relatively large or relatively small diameter work
pieces in the pot chuck.
`
' `
1
line 8-8 of Fig. V1, showing the footstock pot.
chuck in elevation;
_
,
Fig. 9 is a fragmentary vertical sectional view,
A further object of the invention is to provide
taken approximately on " the line v9--9' of Fig. 8
an improved steadyrest whichY also serves as a 55 through the footstock pot chuck; ' "
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.
3
Y
front of the machine base. This type of feeding
‘/ Fig, 10 is a fragmentary elevation of the head
stock pot chuck, on a reduced scale, showing the
clamping strap in inverted position for clamping
is substantially the same as that shown in the ex
relatively large diameter shafts;
pired patent to C. H. Norton No. 762,838 dated.4
Fig. 11 is >an enlarged view of thel calibrated I
scales on the headstock pot chuck, showing the
setting of the scales for positioning the head
stock pot chuck;
. , .
Fig. 12 is a similar enlarged view, von a reduced'
mechanism is old an-d well known in the art and
June 14, 1904, and consequently has lnot been
illustrated and described in detail. For details
of disclosure not contained herein, reference may
~ be had to the above mentioned expired patent.
The wheel slide 3| serves as a support for a ro
line I3-|3 of Fig. 1, showing‘the combined
steadyrest and crankpin aligning and gauging-
tatable grinding wheel 35 which is mounted on
the left-hand end of a rotatable wheel spindle
36 which is journalled in suitable bearingsI (not
shown)- within the wheel slide 3|. The grinding
wheel 35 is preferably driven by an electric motor
31 mounted on the upper surface of the grinding
wheel slide 3|. The motor 31 is provided with a
mechanism in end elevation;
multi-V-groove pulley 38 which is connected by
scale, of the calibrated scales on the footstock
pot chuck, showing the setting of the scales for
positioning the lfootstock pot chuck;v
Fig.. 13 is a fragmentary crosssectional view, on .
an enlarged scale, taken approximately on the;
~ „
multiple V-belts 39 with a multi-V-groove pulley»
Fig. 14 is a plan of the _combined steadyrest and `
4U mounted on the right-hand end of the wheel
crankpin aligning andgauging mechanism; _,
Fig.- 15 is a- fragmentary horizontal sectional 20
'I'he work supporting table 2| serves as a Isup
view,.on an enlarged scale, 'taken approximately
port for a headstock 4| and a footstock 42 which
- are arranged rotatably to support a crankshaft
Fig. 16 is a fragmentary' cross sectional view,
43 for a predetermined grinding operation.
taken approximately on the' line.| 6-| 6 of Fig. 13;
The headstock 4| is preferably a motor driven
Fig. 17 is a cross sectional view, on an enlarged 25
headstock in which a face plate 45 isñxedly
scale, taken approximatelyon` the line |1-l1
mounted relative to a multi-V-groove pulley 46
which is journalled by suitable anti-friction bear- Y
Fig. >18 is a fragmentary side elevation, on an
ings 41 and 48 adjacent to the right-hand end of
enlarged scale, >showing the stop screw and scale;
VFig. 19 is -a fragmentary elevation, on an en 30 a non-rotatable headstock spindle 49 (Figs. 1 and
spindle 36.
ofFig.13’;V
"
.
"
Y
Y
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larged scale, .showing the scale calibrated in
inches of crankdiameter for positioning and
aligning the cra'nkpins;- '
Y
Y
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Fig.V 20 is a fragmentary vertical sectional View,
5). An electric motor 50 is mounted on the upper `~
surface of the headstock 4I. .The motor 5|)._is
provided with a multi-V-groove pulley 5| which
is connected by multiple V-belts 52 with -a multi
V-groove pulley 53. The pulley 53 is supported by an anti-friction bearing 54 which is in turn'sup
Fig. 21`is a, fragmentary sectional View, takenv ported on an eccentrically mounted' adjustable
sleeve 55 projecting from the left-hand of the
approximately on` the line 2|-2| of Fig. 13;
headstock 4| (Fig. 5). -A multi-V-groove pulley
22 is a vertical sectional View, onV an‘ en
40 56 is iixedl'y mounted relative to the pulley 53 and
larged scale, through the footstock; .
-Fig.v23-is an'en'd elevation of amocliñed potV is journalled at its left-hand end by an- anti-fric~_
tion bearing 51. The anti-friction bearing 51 is
chuck, on a reduced scale, showing an adjust
supported on the left-hand end of the sleeve 55.
ment lforthe -pot chuck; and
"
on a reduced scale, taken approximately on the
line 20-20 ofFig. l14;
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The pulley 56 is connected by multiple V-belts 58
Fig. :24 is a front elevation, on an renlarged
45 with a multi-V-groove pulley 59 which is keyed
scale, of the pot chuck shown in Fig. 23.
to the left-hand end of a rotatable shaft 60. VThe
shaft 60 is journalled in anti-friction bearings
6| and 62 which are in turn supported in anad
justably mounted eccentric sleeve 63 in the head
slide longitudinally relative to the base 26 on a 50 stock frame. A multi-V-groove pulley 64 is keyed
to the right-hand end of the shaft 60 and is con
V-way v22 anda flat way 23 (Fig.‘2_). The table
nectedby multiple V-beltfs` 65 to-the multi-V
2| may be moved longitudinally by .means of a
groove pulley 46 whichcarriesthe face plate 45.
manually operable hand traverseV mechanism
The face plate 45 serves as asupport for an ad
whichl is substantially the same as .that shown
in the expired U. S. patent to C. H. Norton, No. 55 justably mounted work supporting pot chuck to
be hereinafter described.
'
«
1,299,765 dated April 8, 1919. This traverse mech
. ATheimprovedcrankshaft grinding machine has
been `illustrated in the drawings comprising a Y
base 20 which supports a longitudinally movable
work supporting table 2| which is arranged to
anism Amay comprise a hand wheel 25 which is
operatively Yconnected to rotate a small gear 26.
The small gear 26 meshes with a larger> gear-_21 g
- The footstock 42 (Fig. 221) -is-provided with a f
slidably mounted sleeve 68 which serves as a sup
port for anti-friction bearings 69 and 10.V The
whichuis supported on a shaft 28. ' The shaft 2S 60 anti-friction bearings 69 and 10 serve asa sup
port for a rotatable spindle 1| having formed
also supports a gear 29 which meshes with a rack
integrally therewith a flange 12 which supportsY
an adjustably mounted pot chuck for supporting
2|. It will be readily apparent fromfthe fore
the right-hand end of the crankshaft 43 to be
going disclosurethat the table 2| may be readily
traversed and positioned longitudinally by man 65 ground. A manually operable hand wheel 13 is
provided for adjustingthe position of the sleeve
. ` ual rotation of the traverse wheel 25. The direc
68 to position the pot chuck to be hereinafter
tion'of rotation of the hand wheelï25 determines
described relative tothe right-hand end of ¿the
theA direction of movement vof the tablevZl.- `
bar 30 depending from the underside of the table
A transversely movable grinding wheelslide 3|
ï _is arranged to slidetransversely relative to the
base 2D of a V-Way 32 and a_ flat Way 33.5‘»The .
` usual and'wellknown nut and screw feed mech
anism is-providedîfor'adjusting the wheel slide
‘ transversely relative to the base comprising a f
Y crankshaft which is tobe supported thereby.
vA' binder screw 14 is provided to clamp the foot
stock sleeve 68 in adjusted position.
The headstock pot chuck (Figs. 2„,3 and- 6) Meern- .
prises a circular platev ßûwhichis located onthe
spindle flange 45 by means of a pair. ofdiamet
i manually operable feed wheel 34V mounted on the 75 rically arranged keys 8| and 82y which arevfitted
2,404,618
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tion thereon by screws »84 and 85.
.
the slide 89 has been adjusted to'the desired and
predetermined position, the slideways'or vguides
in a diametricallyarranged keyway 83 (Fig. ‘2).
The plate 80 is accurately located and centered
relative to the face plate 45, after which it is
located by dowel pins and is clamped in posi
The chuck
plate 80 is provided with a diametrically arranged
dovetailed slideway 88 which is arranged sub
stantially at right angles to the keys 8| and '82.
The dovetailed slideway 88 is ñxedly mounted
on the plate 80. A transverselyY movable pot l()
chuck slide 89 is provided' with a dovetailed slide->
way mating with the dovetailed slide 88’. Addi
tional slideways and guideways 90 and 9| are; ar
ranged to engage slide surfaces92 and 93 Von the
90 and 9| may be clamped rigidly in position to
lock the slide 89 into a fixed position relative `to
the pot chuck plate 80.
To facilitate adjusting the chuck and regrind
ing crankshafts` having crankpins and 'main bear
ings of different diameters and throws, a pair of
graduated scales are provided, as shown in Fig.
ll. ‘A “bearing diameter” scale |I5 is fixedly
mounted- on the pot chuck slide 89. This slide is
calibrated to read “inches bearing diameter” of
the main bearing ofthe crankshaft to be ground.
A “throw” scale |I6 is ñxedly mounted relative
15 to the pot chuck plate 80. The scale |I6'is cali
outer edges of the slide 89 (Fig.»2‘) .
brated to read “inches of throw” of the crank
The pot chuck slide 89 is provided `with work
pins to be ground. The main bearingl 96A of the
supporting plates-94 and 95 which are flxedly
mounted thereon and are arranged to form a
V`-shaped work supporting surface to support a
crank bearing 96 adjacent to the left-hand end
of the crankshaft 43. A clamping strap 91 is piv
20
otally mounted at one end on a stud 98.` The
crankshaft 43 is 2%" in diameter and the crank
pin- throw of the crankshaft is 2%”, consequent
ly'theposition of pot chuck slide 89 is adjusted
so that 2%" 0n the bearing diameter scale coin
cides with 21A” on the throw scale, which serves
ported on a stud I0| which is in turn'ñxedly `
precisely `to locate the slide 89 with the bearing
surfaces 94 and A95 in proper position to support
the main bearing '96 for a grinding operation on
a crankpin. After the slide 89 is thus adjusted,
the slide may be clamped in adjusted position, as
mounted on the pot chuck `slide 89. The clamp
above indicated.V
other end of the clamping strap 91 isf provided
with a substantially U-shapedA notch 99l`which
is’engaged by a pivotally mounted clamping screw
|00; The clamping screw |00 is pivotally sup
l
In’ order to locate the pot chuck in a vertical
ing screw |00 is threaded at its upper end and
is provided with a nut |02 by means of which 30 or loading position, a spring-pressed plungeror
detent I I8 lis provided and arranged to engage a
the strap 91 may be clamped to hold the main
notch I|9 formed in or iixedly mounted on the
bearing 96 rigidly in vposition on the V-shaped,
periphery of the pot chuck plate -80 (Fig. 2). The
spring-pressed detent I I8 is supported by a brack-l
to accommodate different sizes of bearings on 35 et |20 which is adjustably clamped to the table
2|. The's'pring-pressed detent ||8 is normally
crankshafts, it is desirableto provide an _adjust
held in engagement with the notch | I9 by means
able vsupport for the pivot stud 98.» In Ythe-pre
supporting surfaces 94 and 95.
n
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In order to> facilitate adjustment yof the chuck,
Aof a spring |2I. An actuating knob |22 is pro
vided by means of which the detent I I8 may be
threaded into a portion of the pot chuck slide 89. 40 withdrawn to an inoperative position and held
in an inoperative position by means of a pin |23
The screw |03 is held inv adjusted position by
after the knob |22 has been withdrawn toward
means of a lock nut |04. lWhen it is desired to
the left (Fig. 2) and turned so that the pin |23 .
release the main bearing 96, the' nut |02 is'loos
ferred construction, the stud 98 is supported on
the upper end of a screw |03 which> is screw
ened. and the clamping screw |00 swung in a
engages an end face on the bracket |20. An ad
broken line position 91a.
In supporting crank bearings of a relatively
large diameter, the clamping strap or arm 91 may
be inverted and positioned as shown in Fig. l0.
counterclockwise direction after which' the strap 45 justably mounted counterbalance weight |25 is
supported on the dovetailed slideway 88.
‘91 may be vswung in a clockwise r'direction into
If it is desired to adjust the position lof the‘pivot
*stud 98 so as to vary the capacity -of the chuck,
the clamping strap 91 is swung to' a` vertical po 50 In order to invert 4the strap 91, the strap is moved
to a vertical position and turned 180° about the
sition in alignment withthe axisof the Vscrew
axis of the screw |03 a's'apivot and then swung
|03, in which position the strap y91 may be turned
into
the position shown in Fig.- -10. It will 'be
in either direction torotate .thescrew _|03 'so as
readily
apparent, 'as previously described, that the
to raise or lower the position of the pivot stud
position of the pivot stud 98 for the clamping
98, after which the screw |03 may be locked in 55 strap
91 may be adjusted vertically by positioning
adjusted position by the lock nut |04.
4
the
strap
91 in a vertical position and then rotat
In order to `facilitate adjusting the pot chuck
ing the same to adjust .the screw 'I 03 as desired.
diametrically relative to the axis of the headstock
A 'similar pot chuck is provided on the footstock
spindle, a rotatable adjusting screw |05 is rotat
42
for supporting the right-hand end of the
ably supported' in a bearing|06 formed in an'
crankshaft
43, as shown in Fig. 1. This pot chuck
end cap |01 which is iixedly mounted on the
(Figs. '1, 8 and 9) is substantially iden-tical with
end of the dovetailed slide member 88. A pair of
the headstock pot chuck, consequently it will not
collars |08v and |09 are arranged above and be
be described in as much detail. The >foots’tock
>low the end cap |01 and are pinned to the ‘screw
pot chuck comprises a supporting plate |30 either
|05 so as to hold the screw against endwise move
fixed or `adjusta’loly "mounted on the flange :12,
ment relative to the end cap |01. The screw |05
which is provided witha diametrically ’arranged
engages a threaded aperture ||0 formed in the
dovetaile'd slideway |3|. A pot chuck slide |32 is
potchuck slide 89. It will be readily apparent
from the foregoing disclosure that >the slide A89v l provided having a dovetailed slideway which
may be readily adjusted in a diametrical direction „70. mates with the slideway |'3|. The slide |32 serves
as a support for work supporting plates |33 and
relative to the axis of the headstock spindle by
|34 which are arranged to form a V-shaped sup
applying a wrench to a hexagonally shaped end
port for a cylindrical portion |35 formed at the
collar |08
_ |`|| on the `adjusting screw |05. The
l
l right-,handend'of the v4crankshaft ‘43. y‘Side guides
:is preferably graduated to `faç':ilitate ‘precise ad
orïslid'ewaj7 blocks 4|36 and |31 Íare provided to SUP
" 1justment of the position ‘of the Í»slide 589-. After
2,404,613
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portjtheÍ oppositesides of the slide|3.2.. :_An ad@>
-justingjscrew >|38 isv rotatably supported-by an
,in` diameter and the throw of _the _crankpins to' be
ground is 2%."f, consequentlythe slide _|32 islad
justed__until¿1_1/a_” on thescale |66 is opposite
21A” on the ¿throw scale„in which position the
against endwise movement by, a‘pair of collars 5 vV,-shaped_supportingY members |33 and |34 will
|40 and >|4|. The screw |38 jisscrew threaded
supportthe portion |35 at the right-hand end of
end cap >|39 Íwhich is mounted von vone. endl ofthe
dovetailed `slide >|3|.
The` screw ,_ |38 ¿is held
into a threaded aperture |42 formed in the „slide '
the crankshaft 43 in a precise position to Iloc’zate
|32. I_t will be readily apparent that byapplying
the mainaxis of the crankshaft in the desired
a wrench |to the hexagonally shaped end portion
o?fsetrelation with the axis of rotationl thereof
or head |43 ofthescrew- |3_8_, .the screw maybe 10 so that the axesof the crankpins l |1 and |10 will
readily rotated to. adjust the position of the slide
|32'in a diametrical direction. A clamping strap
|44 is pivotallymounted at one, end by a studV |45.
coincideY with the axis V_of `rotation of ythe pot
chucksß?. and
|30.l
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.
Incase _it is desiredto set the pot chucks to
Thestud |45 is in turn -_supported lby a screw |46
support »the main bearings 'of _the ___crankshaft 43
whichiis 'threaded into‘aportion of the slide |32 _ 15 in alignment withy the axis of >rotatiorrfof the
and is held in‘adjusted >position relative thereto
chucks, it is desirable to provide an adjustment
by means yof a check nut |41. It Awill be readily
whereby the pot chuck maybe adjusted in a lat
' apparent from the foregoing disclosure that' the
eral direction, that is, normal to the directionbf
position of the pivot> |45 fortheçstrap |44 may
slide adjustment of _the chuck for producing'the
be- readily adjusted to Aaccommodate various >di- „_»0 desired throw. fAs illustratedin the modiñcation
ameters formed on the right-hand end of acrank
shown in Figs. 23 and 2_4, the pot chuck plate`80
is providedßwith ya, slightly lateral"adjustrnent
shaft.
.
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The clamping strap |44 is provided with a swb
stantially U-shaped notch |48 at its right-hand
endY (Fig. 8). YA clampingscrew |49 is pivotally 25
supported by a stud |50 which _isin turn fìxedly
supported relative to; the pot chuck slideV |32.`
When the clamping strap |44 is_moved into' an
operative positionV (Fig. 8), the clamping screwv
|49 may be swung ¿in a counterclockwise 4direc- 30
tion into fthe Aposition‘illustrated'in Fig. 8, after
which a clamping nut |5| may b'e tightened `4to
` clamp the strap |44v >to rigidly support the por-g
tion~| 35 ofthe crankshaft 43 inA an operative posi-'
tion.
relative to the _face plate 45. A pivot'stud |80
passes through the plate 80 andV also _through the f
faceplate 45. A pair of clamping «boltsv |`8|- and
|82 pass through _closely v1_itting`lioles «the pot
chuck plate 8_0 and then through clearance holes
|83and |84, respectively, in the.face"p1_ate`45._' `It
will _be readily apparent from the foregoing`dis-`
closure that the pot chuck Yplate 8_0 may be ‘swung
in a lateral direction about the axis vof the bolt
or stud |80 as yapivot._ _ The 'extent of'lateral
adjustment is limited by the clearancev provided
.inthe holes |83 and |84. ._ _ToA facilitate a precise
An adjustably vpositioned _counterbalance _ 35 vlateral adjustment of the'plate |80,V a stud|85 is _
weight |52`is also provided whichis supportedon
the dovetailed slideway .|3|. _ `
In order .to locate the pot Ychuck plate | 30 in`
'iixedly mounted in the pot chuck plate 80 and ex
tends through anotch |86 provided'idtheface
plate45. A pair of opposed adjustingscrewsf|81
ï' a vertical or loading position, a spring-pressed
and |88 arescrew threaded into portions |89 and '
detent |55 ,is arranged to _engage a notch |55 .m ,|90 of the face plate 45. The ends of the screws
which is supported in fixed relationshipwith the
|81 andr |88 _are arranged toenga'ge the stud |85
pot chuck plate |30. The detent |55_is supported
1 by abracket |51 which is arranged-to beadjust’
en_diametrically opposite sides. If a lateral ad
justment ofthe pot chuck is desired, the clamp
ably clamped onto the upper surface of the table
ing bolts |8| and |82 may beY loosened and by
2|. . A spring |58~normal1y tends to hold the de- ,45 Vmanipulation of the adjusting screws |81 and
.tent |55 inv-engagement with the notch |56. Y An
„l 88, the pot chuck plate 80 may be swung through
actuating knob |59 is provided whereby the de
tent may be manually withdrawn to an inopera
tive positionwhen desired.
. '
a limited distance either in a >clockwise or'c'oun
terclockwise direction (Fig. 2'3)_','_`a_fter"which the '
potchuckfplateßß may be clampedrigidly to the
l - :In order to `time the chuck plate |30 with the _5,0 ' face
chuck‘plate >80, -it is desirable to provide a suitable'îy '
»adjustment wherebyone of the pot'chucksmay be
angularly adjusted relativeto the other. As illus
trated inthe drawings, the notch |55 is prefer
plate 4.5¿by means of the‘clamping bolts |80,>
I_ß'l and~_|82. "A_similar' lateral adjustment vmay
' also be _provided _for the’pot chuck plate_|-30, .to
Vfacilitateadjusting the plate |30 Ylaterally.rela
tive to the flange 12.
Í
. _ _ _.
_
t ably-fome@ in _a block leo which is adjustablyü
In grinding a _crankshaft such as that shownin
_clamped in_ position onthe chuckplate _|30 by _
Fig. 1, it is desirable -to provideV suitable steady
apairof screwslßl and |62. vThe'screwsl6l and ‘
rests for steadying the orankpins to beV ground.
|62 pass through elongated slots formed in the
_ lblock |60. l AA pair of opposed adjusting vscrews .
In the preferred.constructiomtwo steadyre'sts are
employed, one positioned to steadyand _support
|63 and |64 are provided which are screw thread- 60 the `crankpin ||1 and th'e other to'steady and
ed into portions of the chuck plate |30 and en- ‘
support the 'crankpin I 10 (only one steadyrest
gage `the opposite Vend faces of the'block |60. It
Vbeing. illustrated in the drawings) .. A steadyrest
willbe ¿readily apparent that by releasingY the
.frame 200 is providedwith Asuitable clamping
screws :|6I and |62 and adjusting the screws |63
means for- removably clamping the steadyrest
and |64,- the chuck plate |30 vmay .beVv readily ad- „e5 frame tothe upper surface of the tableZl. The
_ justed relative to the chuck plate 80 as desired.
steadyrest frame 20|)v supports a horizontally ad
In order to facilitate precise adjustmentl of
justabley Vslide l20| which in turn 'supportsv a
, j. the _pot chuck slide |32, graduations are provid
_steadyrestshoe >202. -A rotatable adjusting screw
ed on the collar |40 to facilitate adjustment of
203v is provided fortransverseiy .'adjus‘tingjthe- f
_ the screw |38. A “throw” scale V| 65 is mounted 70` slide >20| of the steadyrest shoe 202 relative to
_ on or ñxedly supported by _the chuck plate |35. " the steadyrest frame 200.'."I‘hel screw 203 is screw
l A __“i'learingV diameter” scale`l lëtî'isY ñxedly. sup
threaded into a threaded- aperture -204 formed
. ported 'on- the slide |32 (FigQl'Zf). In accordance
‘ .with the setting illustrated in__Figs 1_, 8, 9i and
1 -12,'~the portion -|35 o1’ >the crankshaft~43 _isjl 1/{1' 75
within the slide 20|. Amanually 'operable hand
wheel-2051s provided for adjusting'fthe screw Aand
„aereaasparagine‘pareggiare gefeest
2.404,6;3
9.
shoe 202. A second or lower steadyrest shoe 206
is arranged to engage the work piece at a point
below the work axis and at a point adjacent to
the line of contact between the wheel `and the
work piece to be ground. The shoe 208 is sup
ported by an arm 201 which is pivotally support
ed by a stud 208. A downwardly extending arm
209 is formed integral with the arm 201 sothat
termined relationship with the bracket 22|).A The
plunger 224 is normally urged in a direction' to
ward the left (Fig.- 13) by means ofV a >compres
sion spring 230. A pivotally mounted lever '23| is
pivotally supported on a stud 232 and is provided
with a work engaging tip 233. An arm’23'4 Íis
ñxedly mounted relative to or formed integrally
with the lever 23|. The upper end of the arm
234 is provided with a rounded end 235 which ñts
the arms 201 and 209 form a bell crank lever. A
rotatable adjusting screw 2| 0 is screw threaded 10 within an elongated slot 238 formed inthe slide '
22| (Figs. 13, 14 and 15).v
,
» _
through a threaded aperture 2|| formed in the
In order to provide onlyïa` limited movement of
steadyrest frame 200. The lower end of the screw
- the spindle 224 relative to the slide 22|, an ad
2|0 engages a portion of the arm 209. A manu
justing screw 238 is screw threaded into an end
ally operable adjusting knob 2| 2 is adjustably
mounted on the outer end of the screw 2|0 and l5 plate or plug 239 'fixed in the end `of the cylin
serves to facilitate adjustment of the steadyrest
shoe 206.»
.
drically shaped slide 22| (Fig.- 15). The screw 238
is provided with an enlarged head 240 which en
gages a TK-shaped slot 24| which is formed inthe
It is desirable to provide a suitable crankpin
end of the spindle 224. It should be noted that
aligning device so that after the pot chucks have
been adjusted vertically for crank throw, crank 20 the T-shaped slot is provided with suilicient clear-l
‘ ance relative to the head 240 ofthe screw 238 so
pins may be indexed and positioned so that their
as to allow a limited movement of the yspindle 224
axes coincide with the axis of rotation of the pot
relative to the cylindrically shaped slide 22 l..
chucks for a grinding operation. In the pre
During a loading operation,` thefcylindrically
ferred embodiment of this feature, the horizon- Y
tally movable steadyrest shoe 202 is utilized to 25 shaped slide 22| is moved toward the right (Fig.
13) into an inoperative position so as to swing the
locate the crankpin to be ground in a predeter
arm 23| and the contactV tip 233 in a clockwise
termined grinding position. ` The steadyrest` shoe
direction into an inoperative position out of en
202 is provided with a crankpin bearing shoe 2|5
gagement
with the work surface. After the crank'
which is preferably of a hard non-wearable ma
terial, such as, for example, a hard cementedcar 30 'shaft 42 has been positioned inthe pot chucks 99
and |32 and the crankpin l I1 rotated into engage
bide. A scale 2 I6 is mounted on the side face of
ment with the crankpin aligning surface 2 I5', the
the steadyrest frame 200 (Figs. 13 and' 19). The
pot chucks are clamped to lock> the crankshaft
scale 2|6 is calibrated in “inches diameter” of
43 in an operating position-»Before the grinding
the crankpin. An index pointer or` zero datum
2|1 is iixedly mounted on the slide 20| and ex 35 operation is started, vthe clamping screw 229 is
loosened and the cylindrically shaped slide 22|
tends through an elongated slot_2|8 in the side
is moved toward the left to swing the arm 23| and
face of the steadyrest. The index pointer l2|1 is
the work >engaging contact member 233 in a
preferably located adjacent to the graduated
ccunterclockwise direction into engagement with
edge of the scale 2| 8. The crankpin ||1 to be
ground is 2" in diameter. Therefore, after the 40 the work surface into the position shown in Fig.
13. The pot chucks may then be rotated manually
crankshaft 43 is positioned in the pot chucks 89
so that the operator may observe by means'of the
and |32, the adjusting knob 205 on the steadyrest
dial indicator whether or not the periphery of
200 is rotated until the index pointer` 2|1 is op
the crankpin A| |1l is concentric relative to the axis
posite the 2" diameter graduation on the scale
2|6 (see Fig. 19). The crankshaft 43 is then ro 45 of rotation of the pot chucks. If the operator finds
by such test'that the crankpin is slightlyvout. yof
tated manually until the crankpin |'|1 bears
true indexed position, ‘that is, in a horizontal
against the shoe 2|5 after which the crankshaft
plane (Fig. 13), the pot’chucks are stopped in
is clamped in position in the pot chucks 89 and
the
vertical vpositions shown in Figs. 2land« 8, .
|32.
In order to check the concentricity of the crank 50 the pot chuck clamping straps are released,
and the adjusting knob 205 is turned precisely to
pin | I1 to determine whether or not it is adjusted
compensate for any out-of-.line condition of the
absolutely concentric with the axis of rotation of
crankpin | |1 in a horizontal plane. The periph#
the pot chucks, a visible indicating mechanism isy
ery of the hub portion of the adjusting knob 205
provided which not only serves to check the con
centricity of the crank pin before grinding but 55 is preferably calibrated in tho'usandths of an inch
diameter of the pin so that suitable compensation
also serves visibly to indicate work size as the
may
be made to align the crankpin. After this
grinding operation proceeds. Thisy mechanism
compensation` has been completed,`the crankpin
may comprise a bracket 220 which is fixedly
| |1 is again rotated relative to the pot chucks into
alignment
the shoe. 2|5,` after `which itmay
60 be clampedwith
in adjusted position y.within the pot
cylindrically shaped slide member 22| which. is
chucks 89 and |32.
Y
" '_
v
slidably keyed within a cylindrical aperture 222
If in testing concentricity of the. crankp`in.,` it
within the bracket 220 by means of a key _223.
is found that a Vertical adjustment of the pin- is
The cylindrically shaped slide member Y22| con
tains a slidably mounted spindle or plunger 224 65 necessari7 so that its periphery will run r'concen
tric, the pot chucks 89 and |32 lmay _be vertically
the right-hand end of which (Fig. 13) bears
mounted on the upper surface of the steadyrest
200.
The bracket 220 serves as a support for a
against an actuating plunger 225of a dial indi- r
cator 226 which is mounted within a protective
adjusted either up or down so that the periphery
of the crankpin ||1 willbe absolutely'concentric`
with its axis of rotation.
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..
,
.Y *l
housing 221. The housing 221 is iixedly mounted
adjacent to the end of the cylindrically shaped 70 In order to prevent forcing the cylindrically
shaped slide 22| rapidly into an operating posif
slide 22| and is provided with a hinged ccverv223
tion with the work contact member 233 in engagee `
by means of which the dial indicator may be pro
ment with the work and to prevent damaging~ the
tected and covered when not in use. A clamping
dial indicator 226,- a suitable stop mechanism- is
screw 229 is provided forlocking the cylindrically
_shaped slide member in the desiredl and >prede
75 provided «.Cgmnrising an adiustablymounted» stop
,
1_1
'
,
tailed slide 248 which is supportedby'aV corre
spondinglyshaped siideway formed_in;the side
face /of the.bracket;220. The slide 246j1nayrbe
clamped iniixed position relative to‘the bracket c»
Y
utiliaing the aligning and gauging'devices previ
ously described, both Aof the' _pot chucks 8S!v and
|32 may be preciselyadjusted relative to the> two
crankpins >which. are to be4 ground while the
shaft is lin the same operating position. »The
_220 by means of a clamping screw 241. The slide
24Sris ypreferably provided with a scale 248 cali
grinding _operation may then proceed with the
lbrated, in f‘inches diameter” of the crankpin which
gaugein an’ operative position, as illustrated in
Figi4 13, and the crankpin ||7 may be ground to
‘ , is arranged adjacent to an index line 249 formed
'
12
ative position relativeto the crankpin' |10;` "By
screwf245 which ~is screw threadedinto a dove
on the bracket
220.
When the cylíndrically
the desired and predetermined extent.
shaped slider22| is moved into'an operative posi
„
After the crankpin V| |1 has been ground, the
grinding Wheel 35 may be moved rearwardly Vto
aninoperative position and the work table 2|
tion, the, movement of thel slide toward the left
V(Fig. 13') continues until the casingY 221 which `
` surrounds the dial'indicator engages the end of
' traversed toward the left by manual rotation of
the stop screw 245. , As previously stated, the
the .traverse wheel, 25so as to position theerank
crankpin ||1 is'2v" in diameter beforethe grind
ing operation, consequently the slide 24|:` is ad-`
justed so that ther2"> diameter reading on the
scale 248 coincides with the‘index pointer 249. In
this position of the'stop screw` 245, _when it is
desired to move the gauging apparatus to an oper
pin Y|10 in an operative Yposition relative to the
grinding wheel, 35. After both of the crankpins
||1 _and |10 have been ground, the steadyrests
may then be positioned opposite»V the crankpins
42`|0and 21| and the crankshaft may then be re
leased within the pot chucksßd and`|32 so that
ative position, the screw 229`rnay be loosened and
the cylindrically shaped'slide 22|` may be moved
the crankshaft 43may be rotated‘into an indexed
Vposition so that crankpins >210 and _21| will have
toward an operative position,; this movement
their axes coinciding'with the axis Aof rotation
being limited _by engagement of the casing 221 25 of the pot chucks.Y The aligning of the vcrank- '
withY the end of Vthe'stop screw 245.
’pins ‘210' and 21| may _be accomplished in the
-After the work piece has been adjusted for con-_
centricity, if desired the work engaging Vpoint
manner
crankpinsaboveV
I|1 and
' described
|10, afterinWhich
[connection
the pins with
may -
233 may be left> in engagement with the periph
be grounde
ery of the crankpin | I1, so that the operator may 30
read the reduction Vin size of the crankpin | I1 as
the grinding operation proceeds.
>
_ j The operation, of _this improved `crankshaft Vre
tent.
to the desired andpredetermined ex
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It willAt-husbe seen Athat there has'been pro
vided-by thisV invention apparatusl in which the
various objects hereinabove v'set -forthtogether .
grinding Ymachine will' be ,readily apparent from
with many thoroughly practical advantages are
successfully achieved. _As many possible embodi
. the foregoing disclosure. vThe opposite ends of
acrankshaft 43 to be ground or reground are
measured-that is,'the end main bearing surfaces
mentsY may beV made Vof the" above invention Vand
as fmany changes might bemade in _the embodi
thereof “are measured, and the pot chucks are
ment above set forth, it is to be understood that
adjusted to position the pot chucksr for support
ing the end ,main bearings of the shaft in the 40
allinatter hereinbefore set forth orshovvn> in the
accompanying drawings> is _to be interpretadas
proper position to grind crankpins of a prede
illustrative and not in a limiting'sense.“ ' i
termined throw. vThefpot chucks are adjusted
yWeolaim:Y
as previouslydescribed until the bearing diame
ter on thescales coincides with the throw indi
*e
f
_
Y
' Vl. In a crankshaft grinding'r'na’chin'e having a
rotatable spindle, a face plate thereon, a pot
chuck for supporting a crankshaft_to- be ground,
cated'on thethrow scales, after vwhich the crank
shaft to _beground is lplacedin position within
theçhucks. If necessary, the headstock or *foot
afslide interposed` between said'pot‘ chuck <and
_said faceplatefto facilitate _adjustment of "said
pot chuck, means toadjust‘ said pot chuckso
stock may >lee adjustedlengthwise relative to the
table 2_|V to adjust the pot chucksrlengthwise of , . that the axis of a crankshaft supported thereby
the Vmachine relative to the, crankshaft. The ` " moves- in aplane normaltofthe spindle axis,
clamping mechanisms for the headstock and foot
and meansrto adjust the position of said slide
stock are common, well known expedients which
relative to said AfaceY plat’efsoïthat the vpath of
adjustment of the axis of a crankshaft supported
have, been'used in the grinding industry?formany
-years. ,a The crankpin to be ground is thenmeas.
urea anda steadyrest zou positioned on thetame
with its shoes in an operative position relative
to the crankpin ,l I1. `rThe horizontally‘mova-ble
steadyrest shoe. 2 |5is adjusted so that. the index
pointer 2|1> coincides with the .crankpin diame
ter on the scale `2|6,` after which the "crankshaft
may be locked in an operative position in the?pot
by _said chuckV to determine crank Ythrow passes
'i through the axis of saidspind1'e._ e
'
2, Ina crankshaft grindingV machine, a ro
i tatable spindle having a face plate fixedly mount
ed thereon, a plate having- a slideway thereon
to
which is adjustably mounted on saidface plate,
a pot chuck for supporting a crankshaft to be
ground, a mating’ slideway on said pot chuck,
said slideways Vbeing arranged to adjust_said pot
chucks 89 and |32. The pûtY Chucks arerthen
preferably. rotated _manually to vtest for concen
chuck so that the axis of a crankshaft supported
tricity ofthe crankpin -| |11. After suitable com
thereby'moves ina plane normal to saidspindle
pensation has been made, if necessary, the crank 65 a'xisand means toY adjust the positionof said
»shaft is locked in position on the pot chucks Vfor
plate and slide relative to saidface plate sothat
' a grinding-operation. _The common type crank
the> path of adjustment of the axis Vof a'crank- 1
fshaft, such as'illustrated in the drawings, usu
shaft supported by said chuck lies vin _a pla-ne
ally has two crankpins which are positioned in
which coincides with the axis of said spindle.,
axial _alignment with each other. AIn Ygrinding
sucha shaft, _two steadyrests are preferably em
p1oyed,-each_of_ which is a duplicate of that shown
in Figs. 13 -and _14.Y ¿One of these `stefadyrests
“'wouldbe positionedin operative position rela
tive to the crankpin | I1 and the other in oper
70
3. In a crankshaft grinding machine having ay
pair ofspaced aligned rotatable work spindles,
a crankshaft supporting pot chuck on each of
said spindles, means precisely to adjust each `of
said chucks in a path normal to the axis of said
spindles. to facilitate grinding crankpins having
2,404,613
13
14
a predetermined throw, and means laterally to'
said pot chuck in' a path normal to the spindle '
each of said face plates, each of said pot chucks
having 'a diametrically adjustable slide on said
latter plate, a V-shaped crankshaft support on
each of said slides, means including'a pivotally
mounted jaw on each of said slides to facilitate
clam-ping the opposite end of a crankshaft on
including a pivotally mounted clamping jaw on
said slide to facilitate clamping a crankshaft on
said support, and precise means to adjust said
slide to facilitate supporting a crankshaft having
a predetermined bearing diameter and crank
throw, said means including a graduated scale
on said slide'` calibrated in> inches-diameter
axis, and means laterally toadjustsaid chuck
adjust each of said chucks bodily in a direction
bodily relative to the face plate so that the lpath
substantially at right angles to said first adjust
of adjustment of the axis of the crankshaft sup
ment so that the path of adjustment of the axis
ported by said chuck passes through theaxis
of the crankshaft supported by said `chucks to
of said spindle.
Y
'
‘ determine Acrank throw passes through the axes
9. In a crankshaft grinding machine havingof said spindles.
a rotatable spindle, a face plate flxedly supported
4."In a crankshaft grinding machine having
thereon,> a pot chuck having a plate adjustably
a pair of spaced aligned rotatable spindles, a
face plate fixedly supported on adjacent ends 10 mounted on said face plate, said pot chuck hav
ing a diametrically adjustable slide on said latter
of 'each of said spindles, an independent pot
plate, a crankshaft support on said slide, `means
chuck' having a plate adjustably supported on
said V-'shaped support, means precisely to adjust
each of said pot chuck slides in a path normal to 20 main-bearing, and a second »scale on said chuck
plate calibrated in inches-crankpin-throw to
the axes of said spindles to facilitate grinding
facilitate adjustment of the chuck for grinding a
crankpins having a predetermined throw, and
crankpin on a crankshaft having a predetermined
independent means laterally to adjust each of
throw. `
said pot chuck plates relative to said face plates
10. In a crankshaft grinding machine having
bodily in a direction substantially at right angles 25
a pair of spaced aligned rotatable work spindles,
to the movement of said slides so that the path
a crankshaft supporting pot chuck on each of said
of adjustment of the axis of the crankshaft sup
spindles, means precisely to adjust said pot chucks
ported by said chucks to determine crank throw
laterally relative to said spindles including a scale
`passes through the axes of said spindles.
5. In a crankshaft grinding machine havinga 30 on each of said chucks calibrated in inches-di
ameter-main-bearing and a second scale fixed
rotatable spindle, a face plate fixedly supported
relative to each of said spindles calibrated in
thereon, a pot chuck including a crankshaft sup
inches-crankpin-throw to facilitate setting up
porting and locating surface, and a pivotally
said chucks for supporting a crankshaft having
mounted clamping jaw associated therewith to
crankpins of predetermined throws, a crankshaft
clamp a crankshaft thereon, and an adjustable
aligning mechanism including a frame, a horizon
fulcrum stud for said jaw whereby the position of
tally adjustable shoe thereon, and precise means
said jaw may be adjusted relative to said sup
including a graduated scale calibrated in inches
porting surface to accommodate crankshafts of
crankpin-diameter on said frame and a zero
different diameters.
6. In a crankshaft grinding machine having a 40 datum on said shoe to facilitate precise location
of said shoe for aligning a crankpin of a predeter
mined diameter so that its axis coincides with the
rotatable spindle, a face plate fixedly supported
thereon, a pot chuck including a V-shaped sup
port and a pivotally mounted clamping strap
associated therewith to clamp a crankshaft there
axis of said spindles.
accommodate crankshafts of different diameters.
plate >including a fixed pivot stud extending
11. In a crankshaft grinding machine as
on, and an adjustable fulcrum stud for said strap 45 claimed in claim 2, the combination with the parts
and'features therein speciñed, of an adjusting
whereby the position of said strap may be varied
means between said face plate and said pot chuck
relative to said V-shaped supporting surface to
through both of said plates, a fixed stud on the
'7. In a crankshaft grinding machine having
a rotatable spindle, a face plate fixedly supported 50 said chuck plate located diametrically opposite
thereto, said latter stud extending through a
thereon, a pot chuck including a crankshaft sup
clearance aperture in said faceplate., and a pair
porting and locating surface and a pivotally
of aligned spaced adjusting screws on said face
mounted clamping jaw associated therewith to
plate which are arranged to engage opposite faces
clamp a crankshaft thereon, an adjustable ful
crum stud for supporting one end of said jawv 55 of said fixed stud to facilitate a lateral‘adjust
ment of said chuck plate relative to said face plate,
whereby the position of said jaw may be adjusted
said lateral adjustment being at substantially
relative to said supporting surface to accommo
right angles to the pot chuck slide.
date crankshafts of different diameters, a clamp..
12. In a crankshaft grinding machine as
ing screw on said chuck to clamp the other end
of said jaw, said jaw being arranged so that it 60 claimed in claim 2, the combination with the parts
and features therein specified, of an adjusting
may be readily inverted to facilitate supporting
means between said face plate and said pot chuck
a crankshaft having a main bearing of relatively
plate including a fixed pivot stud extending
large diameter.
`
through both of said plates, a fixed stud on the
8. Inra crankshaft grinding machine having a
rotatable spindle, a face plate ñxedly mounted» 65 said chuck plate located diametrically opposite
thereto, said latter stud extending through a
thereon, a pot chuck adjustably supported on
clearance aperture in said face plate having a pair
said plate including a V-shaped crankshaft sup
of aligned spaced adjusting screws on said face
port and a pivotally mounted clamping strap to
>plate which are arranged to engage opposite faces
clamp a crankshaft therein, an adjustable ful
crum stud for one end of said strap whereby the 70 of said fixed stud to facilitate a lateral adjust
ment of said chuck plate relative to said face plate
position of said strap may be varied relative to
so that the path of adjustment of the axis of a
said support to accommodate crankshafts of
crankshaft supported in said pot chuck intersects
different diameters, a clamping screw on said
the axis of said spindle.
chuck to clamp the other end of said strap, means
13. In a crankshaft grinding machine as
including a nut and screw precisely to adjust 75
l
2,404,613 -
15
claimed ,irlV claim .2, `the combinationwith the
16
ing crankpins having predetermined throws, a
partsßand‘featùres ‘therein Sp`eciñed,:cf an `ad
crankshaft aligning mechanism includingl an ad-A
justable 'shoejl precise means for adjusting said
justing Ymeansbetween- said face'plate Vand said
pot chuck plate including asñ'xed pivot stud ex
shoe to locate said shoe for aligning a crankpin
tending' through both of said plates, a fixed stud 6 of predetermined diameter so that itsvaxis coin-v
on said chuck plate located ldiametrically Opposite
cides with the axis of said spindles, a, visiblem-f
Vthereto,'said 'latterstud extending through? a
dicating mechanism including a dial vindicator
Wherebythe concentricity of a'crankpin may; be
-clearance’aperture in 'said face plate having` a‘pair
Y. of aligned spaced adjusting screws on said face
readily determined, a slidable mount for said _in
plate which are arranged to engage opposite faces 10 dicator whereby it may be readilymoved to and' ì
of said 'ñxed stud to facilitate a lateral adjust
from an operative position, a Workl contacting
ment of said" chuck Aplate relative to said face
member, andmeans. including a lever'connecting '
plate so that the >path of adjustment of the axis
said member' with said d_ial indicator, ¿and pre
of the crankshaft supported in said pot chuck
cision means for moving saidindicator precisely
lies in a ~plane containing'the axis ofsaid spindle. 15 to a predetermined operating positon correspond
14; In >a crankshaft grinding machine having a
ing with the diameter of the crankpin .to _be
pair of spaced aligned rotatable Work spindles, a
ground.
crankshaft‘supporting"pot chuck on each ofl said
-
spindles, means to adjust said pot chucks laterally
relative ‘to said Vspindles to facilitate'setting' up 20
said chucks forV supporting a crankshaft' for grind
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AALBERT C+.BELDEN.1Y
CARLG.FLYGARE.
v'OIVYAE.HILL.»
-.
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