US2587952A

US2587952A - Grinding machine

Info

Publication number: US2587952A
Application number: US718738A
Authority: US
Inventors: Amedee D Appleby
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-12-27
Filing date: 1946-12-27
Publication date: 1952-03-04
Anticipated expiration: 1969-03-04

Description

March 4, 1952 A. D. APPLEBY 2,587,952

- GRINDING MACHINE Filed Dec. 27, 1946 a Sheets-Sheet 1 IN V EN TOR. Y

m flTTOR/VEX "MI" W March 4, 1952 A. D. APPLEBY GRINDING MACHINE 8 Sheets-Sheet 2 Filed Dec. 27, 1946 INVENTOR. flmedeeflflpplelzy Z I HIS ATTORNEY March 4, A. D. APPLEBY 2,587,952

GRINDING MACHINE Filed Dec. 2'7, 1946 8 Sheets-Sheet 5 INVENTOR.

' H16 ATTOR NE'Y March 4, 1952 A. D. APPLEBY GRINDING MACHINE 8 Sheets-Sheet 4 Filed Dec. 27, 1946 IN V EN TOR.

flmedee' D. flppleb y HIS flTTORNE'Y March 4, 1 952 A. D. APPLEBY ,587,

GRINDING MACHINE Filed Dec. 27, 1946 a Sheets-Sht 5 82 zzvmvrom.

0 flm edee D. flppleby I BY v 3 His 'r'romyEr March4, 1952 -B 2,587,952

GRINDING MACHINE Filed Dec. 27, 1946 8 Sheets-Sheet 6 J06 106 In:

INVENTOR.

flmecle D. fl leb I BY MW HIS A TTORNEY March 4, 1 952 D, 'P 2,587,952

GRINDING MACHINE Filed Dec 27, 1946 8 Sheets-Sheet 7 1&5 110 IN VEN TOR.

.Amedee D. flppleby ATTORNEY March 4, 1952 E Y I 2,581952 GRINDING MACHINE Filed Dec. 27, 1946 s Sheets-Sheet a :94 INVENTOR.

AmedeD/lppleby HIS ATTORNEY Patented Mar. 4, 1952 f-UNITED STATES-PATENT OFFlCE GRINDING MACHINE Amedee D. Appleby, Odessa, Tex.

Application December 27, 1946, Serial No. 718,738

8 Claims. (01. 51-105) '..1.This invention relates to improvements in grinding machines of the character adapted particularly for'the grinding of ball or roller hearing races on odd or irregularly shaped devices, such'as the segments of rock bits used on rotary well'drills in the drilling of deep wells.

While various machines have been proposed heretofore for grinding the cups and cones of rotary bits and the like, these for the most part have lacked the flexibility for performing the desired grinding action and have not been constructed so as to be capable of grinding both the convex and concave races in cones and cups, as is often desired. One object of this invention is to improve the construction of grinding machines, so that a machine may be capable of grinding both the cups and cones of a rock bit or other parts of an irregulaf piece of machinery without requiring'separate machines or devices for the respective con- 'vex' and concave objects.

Another object of the invention is to provide agrinder that may be adjusted readily with respect to the work and on which the work may be secured in place with facility for the performance thereon of the necessary grinding operation. Still another object of the invention is to improve the construction of the grinding machine to perform the desired grinding operation by means of a machine which is simple in construction, light in weight, and which may be moved readily from place to place, as desired.

In'carrying out these objects, a grinding machine may be so constructed as to provide for mounting of the object thereon and securing it in proper relation to the grinding element. Provision is made to adjust the position of the support and the grinding element relative to each other so these may be brought into the proper relation, both axially and angularly, for the proper alignment and positioning of the respective parts of the machine and to provide for the correct operative relationship between these parts. Both the grinding element and the mounting for the work may be power driven in operative relation to accomplish the desired grinding action. By the adjustments provided, the machine can be used for grinding the cups and cones of both convex and concave races, or

other irregularly shaped objects, as desired.

Certain embodiments of the invention are illustrated in the accompanying drawings, in which: 1 is a perspective view of one form of grinding machine. embodying this invention;

Fig. 2 is a side elevation of the operating structure thereof;

Fig. 3 is a verticalsectional view through the grinding portion of the machine, substantially on the line 33 of Fig. 2;

Fig. 4 is a horizontal sectional view through the machine showing the work holder in plan, substantially on the line 4-4 of Fig. 2;

Fig. 5 is a horizontal section substantially on the line 5-5 of Fig. 2, and showing the driving connections for the operating parts;

Fig. 6 is a vertical section through the jack shaft mounting on the line 6-.B of Fig. 2;

Fig. '7 is a detail horizontal section through the spindle mounting clamp on the line l -l of Fig. 2;

Fig. 8 is a longitudinal sectional View through the work-holder on the line 8-8 of Fig. 4;

Fig. 9 is a transverse sectional view therethrough on the line 9--9 of Fig. 2;

Fig. 10 is a perspective side view of a modified form of the invention;

Fig. 11 is a view similar to Fig. 10, but from the opposite side thereof; and

Fig. 12 is a perspective view of the rotary table as shown in this modified form.

Referring to Figs. 1 and 2 of the drawings, the operating mechanism of the machine is shown as mounted on a supporting stand which may be seated on the floor, although any other suitable form of mounting may be used, as desired. This stand is formed by a base l, upon which is supported an upright standard 2. Carried by the upper end of the standard 2 is a supporting member 3, shown as in the form of a plate which is provided with a sleeve 4 fitted over the standard 2, and the plate extends transversely to opposite sides of the standard and supports thereon the operating mechanism of the machine.

Referring to Figs. 1, 2 and 6, the support 3 has upstanding therefrom a bushing 5, fixed to the support and internally threaded for screwthreaded connection with the threaded lower portion 6 of an upstanding sleeve 1. These parts may be locked together by a handwheel 8, which is screw-threaded on the portion 6 of the sleeve into abutting relation with the upper end of the bushing 5. This forms a support for the sleeve 1 and holds it rigidly in place for mounting the grinding spindle as hereinafter described.

Telescoped over the upper end portion of the sleeve 1 are spaced bushings 9 and I0 which-are also journaled on the sleeve 1 and are capable of vertical adjustment relative thereto. The bushings 9 and [0 are supported in their elevated positions by the skirt portion l l of a handwheel 3 I2 which is'screwed onto the threaded portion 6 of the bushing 7. By adjusting the handwheel I2, the bushings 9 and I may be adjusted vertically relative to the sleeve 1.

The bushings 9 and H! are held in spaced relation by a clamping segment 43 which fits between the bushings 9 and H3 in embracing relation with the sleeve l, as shown in Figs. 6 and 7. The clamping segment [3 is attached through a journal connection. to the inner'jend of a threaded stem 14' which is screw-threaded through a bushing l5, and is provided with crank 16 on the outer end thereof, as a suit- Lthejbushing 44 and is journaled in anti-friction able means for rotating the threaded ;stem 1.4, as shown clearly in Fig. '7. The threaded bushing is mounted on a bracket l'l- Whichextends in bridging relation between theadjacent;

ends of the bushings 9 and i0, as shown in Figs. 1 and 2. The threaded stem It may be adjusted to press the clamping segment 13 into frictional engagement: with the periphery of the sleeve 1 for securing the bushings 9 and :llliin adjusted-positions vertically-along the .axisof thesleeve.

Extending horizontally from-'tthe-bushings- 9 and'llLare supportxarms I8.and l9,"respectively, rigidly .attachedto the bushingsatnne endjas by welding, and-at the opposite end 'bEiIIg'LSimI- larlyattachedto an upright sleeve 20 having an axis extending parallel with the axis of the sleeve 1 andcarriedthereby for swinging movement to .differentpo'sitions relative thereto. i

As shown "in Fig. '3, zthe' sleeve 20 supports a grinding spindle: 2|, journaledatherein by antifrictio'n bearings 22 and 23 :which'areconfined inwfthe :sieeve by. adjustment nuts 24 andr25, having screw-threaded. connection with opposite endportions of'the sleeve. a

The lower end of the grinding spind1e;.2.l is shown as provided with a grinding element 26, such as an emery wheel, althoughany suitable form of abrasive devicemay be provided thereon as desired. j -The upper 'end' of the grinding spindle 2|; has a pulley 21 fixed thereon: The'pulley 21 is shown in- Figs. 1 and 2, as connectediby a belt 28 with apulley 29,- fixedto the upper end 'oi'a jack shaft3il-(Fig. 6). I I i i-The jack shafttu extends vertically through the sleeve 1" and is journaledr in anti-friction bearings 3| and .32 therein. The bearingsfii and 32 may be adjusted and-are confined by adjustment nuts 33' 'ar'1d 554;v which are'threaded into-opposite .ends of :the sleeve in theform illustrated g The lower endof i the jack shaft 30 is pro.- vided'with' a pulley 35fixed'thereonp The pulley 35 is connected through a driving'beltfifi with apulley. 31- mounted on the armature shaft of? an electric motor 38, in the form illustrated in Figs. '1 and 2, which-forms the .source of power. forndriving' the operative parts of.- the machine. .The electric motor: 38 is. shown as mountedonbrackets 39, secured to .one end. of the supportflv The spindle 2! is: capable of axial adjustment relative to thesupport sleeve 1, as well as circumferential adjustment relative thereto; To provide for these adj ustments I have shown an arm 40,. extending radially fromthebushing 9 inthe Opposite-direction from the supporting armv l8. Theouterend of the arm v4! carries a crank rod 41, journaled therein on .awswivel, thethreaded portion otwhich rod is shown as engaging n internally. threaded. bushing" 32,

4 mounted between upstanding posts 43 shown as slightly spaced apart and carried bythe support 3. This will provide adjustment of the arm 40 about the axis of the sleeve 7, thereby circumferentially adjusting the grinding spindle 2| therearound. It will permit also axial adjustment of the spindle 2| relative to the sleeve 1, while maintaining the same angular position relativethereto, which is permitted by theswiveled connection" of thercrank rod 4!. with the arm 40.

Referring to Fig. 3, the opposite end of the support 3 is shown as formed with a depending bushing M. A shaft 15 extends upwardly through

bearings

46 and 41, adjacent its opposite ends.

Mounted'on the upper end of the shaft 45 is a,.turntable .48, which is not only keyed to the shaft at 49, but is also secured rigidly there- The turntable 48 forms the work support and has provision thereon for supportingthe work. inxian operative relation with- (the rindingelement 26. .In the formxof the invention. illustrated in Figs.- 3, 8 and19, in. whichthe: work to; be-giound mayucomprise elements ofa .rock .bit, generally indicated at-B in .Fig;8,' such as aracewayaR on 2 a bit segment; .-provision sis imade. for .mounting -this segment on the turntable 48: for adjust? ment tozdifferentangularpositions. with respect toithe grinding element 126.; i In this-form, anadjustable:supportsisprovided at, .51 havingan .eye portion .52: along ioneiedge thereof; the su-pportfil being shown as preferably in the form of a plate. Theeye portion 52is sleeved, over :au'rod ;53 with. which it :has screwthreaded. adjustment at; 54, sfo'r1 adjustment of the support ,5 I., longitudinally ofj the rod 53 uponrotation .of. saidv rod.. The rOd 53, is journaled in brackets 55 and56; upstanding from the turntable 48, and issprovided with aahand crank 51, as a suitable -means for adjustment of. the rod to accomplish the. desired I adjustment f1 h pport.5na;illhe suppo t 1115 a oeapable :of being {tilted to different-angular posii n .b means f adlllstine rew 56 avhichars threaded. through, ear .9 fo ed on op osite ede sot he s ppor fil n -bear uponwt e upp ac o t e turnt le 8 aswill ..gv dentyfmm F san M j .A s c su porti 'shown M 0. a mounte u on support 51,- The sup rtfi lh s sl ve w ti i uri a ed 021s ra ii ithwhiqnit lso as; trewr hre d d.sonnt ti zl $01 ad u m of. the u e 6&9 alone t e wt rtfi upo mating 9 he. d ,Z-;-. .i=i r d. ;st Wn-a$ provided wi th a hand crank 63 for turning movement thereoflf. This rod is. journaled'inupstanding brackets ,tdmounted onthefsupportil, The support 6!} is cana blefof transvers'adlustment by .an adjusting" screw 65, "threaded through' an ar 65 rm dfln fs t 69 'andin i i ment with" the upper face of the support 5 l. f Mounted on the Support 6E! is'ajig' fixture 61 which is" illustrative" of mountings that may; "be used onthe'rotary table for holding and positioning an-nregui r object in grinding relation j with.

to confine the latter therein whenfpressedagainst the inner side of the fixture by an angularly shaped dog 68 mounted on a fulcrum 69 upon the support 60, as shown in Fig. 8. One end of the dog 68, is engaged by a screw shank 10, shown as having threaded connection with the support 68 and provided with a hand crank for rotation thereof to tilt the dog 68 on its fulcrum 89 and cause one end of the dog to be turned in transverse relation with the under side of the segment B, holding the latter securely in, the jig, fixture 61.

The support 60 is shown as having upstanding sides between which the jig fixture 81 is fitted as will be evident from Figs. 8 and 9. This fixture is adapted to be secured in place on the support 88, for which purpose it is provided with a lug 1| engaged by a cross bar 12 that extends transversely over the jig fixture, as shown in Fig. 9. The opposite ends of the cross bar 12 are confined by tie bolts 13 connected therewith and extending downwardly to the turntable 48. The upper ends of these bolts 13 are provided with wing nuts 14 for tightening the cross bar 12 securely upon the lug ll of the jig fixture.

A pair of dowel pins 15 protrude from the respective side faces of the jig fixture 61, perpendicularly thereto, in position to engage holes in the faces of the bit segment B which will provide a definite indexing of the bit body segment with respect to the jig fixture to insure proper alignof swinging said arms to move the shaft 19 in an are about the axis of the pin 85. The handle 81 may be secured in an adjusted position by means ment of the raceway R, with the abrasive element 26. By having the dowel pins 15 positioned ular thereto in accurate spaced relation, so as to interengage with holes provided in the rock bit segment, the latter may be brought quickly into I, accurate alignment without requiring adjust, ment, and segments presented and removed'in After the bit segment B is in place and confined r by the dowel pins 15, fitting into holes in the segment, the clamp 88 is moved into engagement with the under side of the bit segment B, by the manipulation of the adjusting member 10 and pressed firmly thereagainst to confine the shank of the bit segment within the V-shaped jig fixture 61. This insures a precise fit between the bit segment and the jig fixture and accurately positions the work with respect to the abrasive ele-' ment.

As shown in Figs. 1 to 3, the lower end of the shaft on which the turntable 48 is mounted, carries a pulley I6 keyed thereto. A belt 11 extends around the pulley l6 and around an idler pulley 18 mounted on an upright shaft 19 (Fig. 5) The shaft 19 also carries a pulley 88 of appreciably larger diameter than the pulley 18 andthe latter is also materially reduced with respect to the pulley 16 to accomplish an appreciable speed reduction in the driving of the shaft 45. The pill ley 88 is operatively connected by a belt 8| with a pulley 82 secured rigidly on the lower end of the jack shaft 38, as shown in Figs. 5 and 6, to be driven from the motor 38.

The shaft 19 is journaled in a sleeve 83 caron both faces of the jig fixture 81 and perpendicof a notched arcuate segment 88, adapted to be engaged by a spring-pressed latch 89.

As will be evident from Fig. 5, an arcuate adjustment of the position of the shaft 19 to the right will loosen the belt 11, while an adjustment toward the left will tighten the belt on the pulleys l6 and 18. Thus the belt tightener serves as a clutch for the rotation of the turntable 48 when shifted toward the right or left from the position shown. When the belt is in proper tightened relation, the parts may be secured rigidly by the latch 88.

In the operation of the machine, a rock bit segment B, in the form of the invention illustrated,

is fitted and clamped to the jig fixture 61, as shown in Fig. 8, and is secured in place by the v clamp 68, held by the screw shaft 10. In this nally at right angles to each other, as well as to tilt either of the supports, and to raise and lower the grinding element 26, the axis of the bearing race R can be brought into the proper axial, aligned relation with respect to the axis of the turntable 48. This provides a universal movement for obtaining a correct adjustment of the work.

The bearing race R is shown as having a concave race cut therein. When the parts are properly adjusted, the turntable 48 is rotated in axial alignment with the bearing race R; the axis of the abrasive element 26 is offset with respect thereto, while the latter is rotated at a high rate of speed as compared with the lower rate of speed of rotation of the turntable. This will cause a groove to be cut in the bearing'race.

The abrasive element 26 is adjusted eccentrically by the screw adjustment 4| to move the abrasive element toward and from the axis of the bearing race R. This element 4| adjusts the feed of the abrasive element during operation which adjustment is possible for different adjusted positions vertically of the abrasive element.

The formed abrasive element 28 may be used for internally grinding in cups or for externally grinding on raceways of cones, by adjustment of the screw 4| thereby causing a bodily shifting of the axis of the grinding element toward and from the center axis of the work. The hand wheel l2 provides for vertical adjustment of the abrasive element with respect to the work. When the abrasive element is in correct adjusted position, the threaded stem i4 forces the clamping segment IS in binding engagement with the upper end portion of the sleeve 1.

-While the adjustments have been described with respect to an operation on a bearing raceway, positioned substantially in axial alignment with the shaft 45, it is appreciated thatthe ad justments of the supports 5| and are such that 7 ed on a shaft II9 by a belt I20.

thei'center ofiairialrotation of the cup orcone of a'bearing racewaymay be made eccentric with respectto the shaft ML'and with the spindle 2I' positioned in axialtalignment with the Shaft-245,.

when an orbital movement is' then accorded to the work, inv such manner that the grinding element is in contact relation with aside of the work while the latter is rotated about the abrasive element 'which operates at a high rate of speed.

It will be appreciated that the unit is provided with various adjustments to accommodate either large or small races or for grinding races on irreg-ularlyshaped "objects, such as may be used on a rockbit body segment, ora true race maybe ground on any element whiohmay be fitted in a jig, even-though the element being actedon is irregular in shape or has special eccentricities from the standard, and have sleeves I! and 38' secured to the outer ends of-the" arms Q95 and I06, respectively, which sleevessecure a tubular shaft housing Iili) in a substantially vertical position.

*AmotOr I I0 is mounted on the outer portionof the base IIlI and has a belt II I encircling a pulley I'I'2 onthe motor Ilil'and'a pulley I'lion'a shaft I Mthat is journaled in bearings I I5 and I i6 substantially parallel to the standard H32;- The"up-' perend ofthe'shaft I I l'c'arries a pulley I Il' which is in driving connection with a pulley I-I B'mount- The shaft II d also carries a'pulley I2I which drives a larger pulley I22 through belt I23 which" encrcles said pulleys. The pulley I22 is1mounted on alshaft I24 which has a pulley I25 directly below said pulley I22. A belt I26 (Fig. 11) encircles ,the pulley 12 d and a pulley I21, which pulley IZ'I is secured to a shaft (not shown) t0 which 'a rotary table I28 is secured. The shaft of the rotary table I28'is mounted in bearings I29 in the pivotal frame I 03.

I 'A holding and truin J'iglgenerallyj designated" at J, isimounted on top ofrotary table I28 on 'a screw-threadedtransverse shaft I30 (Figf12);

extending substantially diametrically across the rotary table I28 and carries a table .I3I upoii whicha screw-threaded shaft I32 is mounted that carries ajtable. I33, A holding fixture IE4 is' mounted on top of the table I33 and has dowel which woudnot adapt it for use in a conventional ball race. grinding machine; It isalso'possible to use this machine for grinding other objects. 20.

tain the article being ground in the. correct ade' justed position.

"The fixture I34. as shown in Fig. 12, is of.120. angularity, which centers a rock bit segment B be pressed upward to hold-the bit'segment'in' place while the abrasive element I40, mounted on the shaft H9 is operated to perform the desired grinding action upon the bearing surfaces of the rock bit segment B". A screw -threade'd shaft I4I (Fig. 10) threadably engages a nut I42 which-is pivotally secured to the undersideof the frame I03, and at'the' opposite end the threaded shaft-MI is secured against longitudinal'movement to a bracket I43, which bracket is secured to the" base II. By the turning of a handle MI on the screwthreadedsh'aft Ml, thetable'lil3 will be swung about the standard I82 as a center, and this will vary the axial alignment of rotary table I28 with' respect to grinder shaft i I9, thereby making possible minute adjustments for regulating the'dis-- tance between the grinder Mil and the axial point of the work in the jig J.

In the operation of the device as shown in Figs.

1.1 to 12, inclusive..the rock'bit segment B or other'worlr, is fitted into the'fiXtureIEIL'and in the caseof a rocl; bit'segmentB', dowel pins are litted through holes inthe'jig 'andintd holes provided in the rock bit segment so asto index properly the rock bit segment which is clamped in'plac'e by the bar I31. By manipulation of the threaded shafts. I 'andYl32 the tables I3I and I33 are shifted transversely with respectto each otherso as to' positionproperly the rock bitsegment B, which bit se ment is mounted in the fixture I34.

Upon starting. the motor. I It, the grinder shaft I I9-is rotated at a high rate of. speed; By engagtightened so as to turn the rotary table I28. to

pins to engage the work being handled. This holding fixture 'I347is reversible so vas to ac'com modate different sized articles that are to be ground. v After the table, I SI has been adjusted trans verselyof the table I2 8, screw jacks "I35,-p ro vided onueither' side of. the table. areftightened foradjusting thewtable to. the correct angularity with respect to the rotarytable I 28.. Screw jacks.

I35 are provided for the adjustment of thetable l 33llto'the correct angularity, after the adiustment of thei screw-threaded shaft I32 has been accomplished. The screw jacks I35 and I36 hold these tables in adjusted positionso as to mainrotate the bit segment'B' Fig. ll, 'in an annular path around theaxis of grinder ShaftIIQ.

As the grinding operation proceeds, the depth or the cutof the grinder l iil is regulatedby turning "the screw-threaded shaft II4I which .will swing the frame I93 about the standard I02.

I A vertical adjustment of the. grinder shaft II9 is-obtained byrotating a hand wheel I09 which has its inner bore threaded for engagement with the threaded portion of the tubular shaft housing I99. When the proper height of the grinder M9, is obtained, a clamp screw I08 is'used bindingly to engage the outer bifurcated portions of the split sleeve 598.

It will be appreciated that this modified form V of the invention is simpleandcompact in construction and that it may be adjusted readily in various ways to obtain the correct adjustments for performing various grindingoperations. V

While the invention has been illustrated and described in certain embodiments. it is recognized. that variations and changes may be made there in, without departing from the invention except as specifiedin the claims. p I v I claim: ,7 s r 1. In a vertical spindle grindingmachine-of the character described, the combinations-f a rotatable spindle having an abrading element mounted thereon, a power driven turntable associated with the abrading element and having a workholder mounted on said turntable, said work hold-- er including a jig adapted to receive work therein, universal mounting means for mounting the jig on the table for shifting movement thereof to different angular positions relative thereto, and power means for driving said spindle and said turntable in coordinated relation.

2. In an abrading machine of the character described, the combination of an upright sleeve, an arm mounted on the sleeve and extending laterally therefrom, a second sleeve carried by the arm, an upright spindle journaled in the second sleeve, an abrading element carried by the lower end of the spindle, a turntable rotat ably mounted below the abrading element and having means for supporting work thereon in operative relation with the abrading element, means mounting said arm for lateral swinging movement relative to the sleeve and for vertical adjustment relative thereto, a drive shaft associated with the first-mentioned sleeve, and means forming driving connections from said drive shaft to the spindle and turntable.

3. In an abrading machine of the character de scribed, the combination of an upright sleeve, an arm mounted on the sleeve and extending laterally therefrom, a second sleeve carried by the arm, an upright spindle journaled in the second sleeve, an abrading element carried by the lower end of the spindle, a turntable rotatably mounted below the abrading element and having means for supporting work thereon in operative relation with the abrading element, means mounting said arm for lateral swinging movement relative to the sleeve and for vertical adjustment relative thereto, a drive shaft associated with the first-mentioned sleeve, means forming driving connections from said drive shaft to the spindle and turntable,

and means for holding the arm in adjusted positions of swinging movement for different vertically adjusted positions of the spindle.

4. In an abrading machine of the character described, the combination of an upright sleeve, an arm mounted on the sleeve and extending laterally therefrom, a sec-0nd sleeve carried by the arm, an upright spindle journaled in the second sleeve, an abrading element carried by the lower end of the spindle, a turntable rotatably mounted below the abrading element and having means for supporting work thereon in operative relation with the abrading element, means mounting said arm for lateral swinging movement relative to the sleeve and for vertical adjustment relative thereto, a drive shaft associated with the first-mentioned sleeve, means forming driving connections from said drive shaft to the spindle and turntable, and means for clamping one of the sleeves and the arm in relatively vertically adjusted positions for holding the spindle in properly adjusted positions.

5. In an abrading machine of the character described, the combination of an upright sleeve, an

arm mounted on the sleeve and extending laterally therefrom, a second sleeve carried by the arm, an upright spindle journaled in the second sleeve, an abrading element carried by the lower end of the spindle, a workholder having means for supporting work thereon in operative relation with the abrading element, means mounting said arm for lateral swinging movement, means 10 for adjusting the spindle vertically, a clamp in position for secure clamping engagement with at least one of the sleeves for holding the spindle in fixed position, and means forming a driving connection with the spindle.

6. A workholder for a grinding machine comprising a table, a jig mounted on the table and adapted for receiving work therein, a transverse shaft mounting means for mounting the jig on the table, a second transverse shaft positioned below said first mentioned shaft at substantially a right angle thereto, and means of moving said jig along said shafts, means for holding said jig in a fixed position, and means for rotating said jig in coordinated relation to said grinding machine.

7. A workholcler for a grinding machine comprising a table, a jig adapted to receive work, a shaft carried by the table and extending transversely thereof, a support mounted on the shaft and carrying a second table having a shaft mounted thereon at substantially a right angle to said first mentioned shaft, a support mounted on said second shaft and carrying the jig, means for adjusting the support axially of said shafts and a clamp member extending upward for cooperative clamping with work in said jig.

8. A workholder for a grinding machine comprising a jig fixture substantially inverted V- shaped in cross section adapted to receive work between the inner sides thereof, dowel pins carried by said inner sides and extending inwardly therefrom substantially at right angles to said sides in positions to engage the work, a pair of screw members positioned on each side of said V-shaped fixture and having an abridging screw threaded bar therebetween and operatively connected therewith for clamping work in said fixture.

AMEDEE D. APPLEBY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 125,434 Battell et al Apr. 9, 1872 551,243 Westphol Dec. 10, 1895 1,211,381 Alden Jan. 9, 1917 1,262,540 Miller 1 Apr. 9, 1918 1,869,413 Edgar Aug. 2, 1932 1,889,248 Kilmer Nov. 29, 1932 1,981,174 Hille Nov. 20, 1934 2,076,682 Strickland Apr. 13, 1937 2,246,023 Spurling June 17, 1941 2,269,946 Lange Jan. 13, 1942 2,286,709 Barous June 16, 1942 2,357,510 Flygare et al Sept. 5, 1944 2,398,628 Dykoski et a1 Apr. 16, 1946 2,413,795 Speed Jan. 7, 1947 2,420,606 McLeod et a1. May 13, 1947 2,432,058 Wiken et a1 Dec. 2, 1947 2,434,600 Swenson Jan. 13, 1948 2,453,573 Hager Nov. 9, 1948 2,486,108 Brunel Oct. 25, 1949 FOREIGN PATENTS Number Country Date 253,335 Italy July 7, 1927 561,722 Germany Oct. 17, 1932