US1988520A - Milling machine for cam shafts and the like - Google Patents

Description

Jan. 22, 1935. w. SINCLAIR 1,988,520

MILLING MACHINE FOR CAM SHAFTS AND THE LIKE Filed March 31, 1930 ll Sheets-Sheet 1,

. lNVENTOR 74 222 2&7 8 x7262 a 2) BY v ATTORNEYS Jan. 22, 1935. w s c MILLING MACHINE FOR CAM SHAFTS AND THE LIKE Filed March 31, 1930 ll Sheets-Sheet 2 lNVENTOR 74 223748??? 6 277 62a 2) Jan. 22, 1935. w s c A 1,988,520

MILLING MACHINE FOR CAM SHAFTS AND THE LIKE Filed March 31, 1950, 11 Sheets-Sheet 3 ZZZ INVENTOR W222 6:72 6/2 in ATTORN YS' Jan. 22, 1935. w smcL l 1,988,520

MILLING MACHINE FOR CAM SHAFTS AND THE LIKE I Filed March 31, 1930 11 Sheets-Sheet 4 xms Jan. 22, 1935. w. SINCLAIR MILLING MACHINE FOR CAM SHAFTS 'AND THE LIKE Filed March 51, 1930 11 Sheets-Sheet 5 BY J LuO/vt/ 7767 A TORNEYS Jan. 22, 1935.

W. SINCLAIR MILLING MACHINE FOR CAM SHAFTS AND THE LIKE Filed March 31, 1950 11 Sheets-Sheet '6 INVENTOR k5" 9- ATTO mS' Jan. 22, 1935. w. SINCLAIR MILLING MACHINE FOR CAM SHAFTS AND THE LIKE l1 Sheets-Sheet 7 Filed March 51, 1930 INVENTOR 7/02/2472; SzzcZazr BY J FGTZRW 11 Sheets-Sheet 8 Jan. 22, 1935.' w. SINCLAIR MILLING MACHINE FOR CAM SHAFTS AND THE LIKE Filed March 31, 1950 v /VVV/////// T N E CV h m z ,W J v M a N$ lwv W $0O iilfl' I Jan. 22, 1935.

Filed March 31, 1930 W. SINCLAIR MILLING MACHINE FOR CAM SHAFTS AND THE LIKE l1 Sheets-Sheet 9 III lNVENTOR 7VZZZZMW/ 5 27w 24 z)" BY M 5 WW ATT6% Jan. 22, 1935. w. SINCLAIR 1,988,520

- MILLINGMACHINE FOR CAM 'SHAFTS AND THE LIKE Filed March 51, 1950 11 Sheets-Sheet 10 WE'ZZZa/W 8272c lair ATTO NE Jan. 22, 1935. w. SINCLAIR MILLING MACHINE FOR CAM SHAFTS AND THE LIKE Filed March 31, 1930 ll Sheets-Sheet ll INVENTOR iWzZZzkwr 5172 cZa zr Patented Jan. 22, I935 g :21.

- UNITED sTATes OFFICE MILLING MACHINE Fore oAMsHA-F'rs 'THEE'RLIZKE. William SinclairpDetroit, Mich,1assignor toPro duction Engineering Company,jDetroit, Mich.', aeorpQrat-ionof-Michigan f Application Marc 31 ,f19s0, Serial No. 44:0;320 9: claims. .('Cl.f oo lan This invention relates to milling machines, and mounting in Figure 3, the cover of the gear :box more particularly to machines for milling the being removed;

profiles -of cams or other irregular shapes. Figure- 11 is a vertical sectional view taken;

One of the objects of the-present invention is substantially on theline'1ll1 of Figure 1 r, the provision of a machine that will simultane- Figure l2 is a central vertical section through ously mill: all of the cam profiles ona multiple a'modifiedformof my machine wherein the workcam shaft or like article, whereby a comparais simultaneouslydriven'fromboth ends. tively quick profiling operation is' secured on the Figure 13 is an endview thereof from the tailentire cam shaft instead of necessitating a series stockend, and In of operations'on the several camsa Figure '14- isadetailvertioalview'through the Another object of this invention is the-arrangemeans ior' clamping and adjusting the position ment of a machine having a pair of heads mountof the tailstock. ed for controlled sliding movement longitudinally Referring now to the drawings, the-numeraI- 'IS- of themachine, and eachhead carrying apl-uraldesignates a base of suitable size and contour, if) ity of spaced milling cutters mounted for conwhich, as herein shown, is arranged to support 15, trolled individual movements laterally oi the mathe head stock 1 6, the tail stock 17, and a pair chine during the sliding movements of the heads. of spaced slidable heads 18,- each of which carry A further object of this invention is the proa plurality of milling cutters, as hereinafter vision of simple drive mechanism for-driving the pointed out. The-head stock 16- is utilized inthe 20 mechanism for rotating the cam shaft being embodiment shown in Figures 1-.11, inclusive, as 20 milled, the several milling cutters and" the control the driving element for the work being milled, mechanisms whereby the heads are slidably for e'xampla'thecam shaft 20 shown in Figure 1 moved and the individual millers advanced orre- The cam shaft is provided with a flange 21 adtracted. jacent oneextremity, and, for driving purposes Other'objects and advantageswill beapparent herein, this flange is apertured at a distance from 25 g from the following description wherein referthe center of the shaft, a pin 22 suitably located once is made to the accompanyingdrawings onthe headstock being adapted to fit into such showing preferred embodiments-of my invention, aperture and rotatethe cam shaft when the; and wherein similar reference numerals: desighead stock rotatable elements are being driven. 3o nate similar parts throughouttheseverall views. The cam shaft 20 is usually preliminarily'ma- In the drawings: I chined' to some extent'beforebeing profiled in my Figure '1 is a plan viewof'my improved machine improved machine, as for example, the ends of with a cam shaft in position for milling. the shafts being machined and scored at "the Figure 2 is a side elevation thereof, with-some centers for locatio-nonmy improved milling niaof the interior'mechanismshown in dotted'lines. chine, and in' addition the center bearingof the 35 Figure 3 is an end'elevation, from the tail'stoek camshaft is machined to also aid in location end. 1 herein. 'In addition the material between the Figure 4 is a central longitudinal section several cams20 might be ground out or other-- through the machine with the camshaftremoved-p wise machined to clear the side faces of the therefrom. V V a several cams.

Figure 5 is an enlarged vertical cross section The mechanismfor driving the head stock 16 taken substantially on theline 55 of Figure 1', will now be described, and at the same time the looking in the direction of the arrows. v p coaction between such mechanismand the re- Figure 6 is a similar cross section taken submai-ning driving mechanisms will be 'pointedou-t.

stantially on the, line 66-of Figure. 1, A single mote-r24 is mountedona bracke'tat one 45 a Figure 7 is an enlarged longitudinal detail see,- side ofthe machinebed and its shaft is contional view'taken substantially on the line 7-7 nested-through the flexible coupling 25- '(note Fig-- of Figurerl. ure6) Withllh pinion 26, suitably journaled in Figure 8 is a vertical section taken substantially bearings on the removable cover plate '27. The on the line 8--'8 of Figure 7., a pinion- 26 meshes with a pinion 28 at one extrem- 50 Figure 9 is a longitudinal vertical section taken ity of" the elongated" shaft 29 which extends comsubstantially on the line 9-4! of Figure l. pletelyacross the framework of 'themachine and Figure 10 is a vertical detail view showing the carries adjacent its opposite extremity a pair of mounting of the shafts and pick-01f gears in the, pfinions-BO and 31' respectively. (Note Figures 6 gear 'box diametrically opposed to the motor and-lli) The pinion 31 meshes with api-nionfi-Z 37 the shaft carries a worm pinion 38 which meshes with a worm-gear 39 keyed-on the rotatable arbor 40 of the head stock (note Fig1iie'4) to thereby turn this portion of the head stock to drive the cam shaft or other work then being milled. The worm pinion '38 alsogmeshe's )with a larger worm gear 41 (note Figures 4 and 6), which is keyed on the shaft 42, suitably journaled in spaced bearings in the framework lS longitudi-i nally of the machine and below the work'bein'g milled. The shaft 42 is adapted to receive a' plurality of master cams 43, eachfashioned to properly control the movements of a milling cutter, as hereinafter described, the master cams" being keyed upon the shaft 42, as by the elongated key 44, and positioned longitudinallyof the shaft any suitable.- manner: On the shaft 42 isalso keyed a spur gear 45;(noteFigures 4 and 8) which meshes witha pair of gears 46and 46 respectivelybolted or otherwise secured at one extremity of the: cam-slotteddrums 47 and 47 (note Figure 7). The slotted drums 47 and 47 are mounted to revolve on stub shafts 48secured in the framework of themachine at either sideof the head stock, and the peripheral cam slots in such drums receive pins 49 and 49%,extending throughelongatedslots 50 in the framework of the machine and secured at their upper extremitiesin the slidable cutter heads 18, which, as best shown in Figures 7 and 8, are slidably mounted in dovetail slots 51 exten ing longitudinally of the machine. The; slots in the cam drums 47, 47, may be suitably shaped and positioned ,to

, -;reciprocate theslidable heads 18 in, any desired manner, as for example to slide thecutter'head slowly inonedirection; for a major portion of the cam slot and then rapidly return the head to its original position. Inactual use it is preferred g-that one head18 be slid in one direction during the profiling operation on the cam shaft while the other-head is being slid in theopposite direc tion, and both are rapidly returned to their initial positions.

by means of aplurality of wormpinions 52 splined on an elongatedshaft 53 and meshing with worm gears 54 mounted on the cutter-carrying shafts (note Figures 9 and 2); The shaft, 53 is journaledlin speced'bearings'in t s b t '1 made for initially adjusting the position of the head 18 and at its forward extremity is provided with a.multiple splined portion 55 slidably fitted within the hub 56 of the worm gear57, which meshes with the worm pinion 58,- keyed or otherwise suitably secured on the elongatedshaft 59, which extends laterally across the framework of v the machine-andis 'journaled at its ends in suitable bearings 60 (note Figure 6). The cutters-in the'other slidable head 18 are similarly constructsingle. motor 24 ,driving mechanisms are suitably I chine head 15.

Adjacent priate speeds. Such driving mechanisms are compactly arranged in the embodimentillustrated. in Figures 1-11 at one extremity of the ma- Moreover, the pinions 26, 28, 30, *31,.3,2;and 34 are mounted adjacent the extremities of their respective shafts so that they can be readily removed from the shafts and replaced by pi'nions' with; different numbers of teeth or the like, in the" "manner of pick-off gears. Such pinions are normally enclosed by cover plates, as the cover-plates27, 2? in Figures 6 and 11. Accordingly, any desired changes in speed ofcertain of the'shafts relatively to other shafts may readily be obtained. Q r

The tailxstock 17 is mounted inlongitudinal alignment with the head stock 16 and includes a longitudinally movable member-17 which may be moved toward or from'the head stock upon rotationof the hand wheel 17 through suitable mechanism, in the usual manner of tail stocks.

The milling cutter. mechanisms are best shown in Figures 5 and 37'. 'Ihe cutters 62 are removably mounted at the inner ends of the shafts 63 in any suitable manner, and the; shafts 63 are mounted for rotation in spaced bearings 64 in slidable quills 65, which as best shown in-Figure 5, are mounted for sliding movement in bushings 66 in the heads 18. The qui1ls65 are normally pressed outwardly away from thework being milled by means of a plurality of coil springs 67 arranged between a portion of the head 18 and a collar 68 carried by the quill. The shaftm63 is provided, with a multiple-spline 63*? which'interfits with the hub of its worm pinion 54'whereby the sliding of the quill may be effected during the continued rotation ofthe shaft 63 and its attached milling cutter 62. The sliding movement of the quill is herein shown as controlled from the mastercams 43, an arm 69 being pivoted'between its ends on the shaft 70 and connected adjacent one extremity with the collar 68 of the quill, as by the pivot pin '71.

7 The other extremity of the arm 69 carries a roller Ineach slidable cutterhead 18 are arranged a." plurality of milling cutter jmechanisrns, as; best shown in Figures 1, 4 and 9, simultaneously driven '72 which bears against the periphery of the master cam 43 cooperating therewith.- The springs 67 serveto maintain the roller 72in constant contact with the surface of the master cam 43 through pressing outwardly on the collar 68 to'which' one extremity of the arm 69, is pivotally secured.

;As best shown in Figure 7, provision may be milling cutter 62 relatively to the work being milled. As herein shown, the quill is formed with a rack portion '73 which meshes with the pinion 74 suitably mounted in theupper portion of the collar68; so that rotation of the pinion 74 will slide the quill 6 5- relatively to the collar 68 whenever the; collar is loosened from the quill. To permit ready'loosening and clamping of the collars 68.upon the quills 65, whenever desired, I have shown in Figure 7 each collar 68 provided with oneofits sides. split, as by the horizontal slot 68 and then provide an elongated shoulder bolt '75 threading into the portion of the collar below the slot, whereby rotation of the bolt in onedirection will serve to tend to, close'the'slot 68 and thereby' firmly clamp the collar 68 upon the quill V 65, while rotation of the bolt inthe opposite dirjeee tioni will serve to :loo'senfthecollar :andffreer. "the; Eigure;.1-,;,and .xthe other head .18 islidtowardthe quillfor longitudinal adjustment:as.:desired.

' The. operation of, my; improved; machine. is; believedto be apparent... .Assume-that;ibis/desired to profile the cams on the cam; shaft ofa four:

cylinder mot-or, which shaft 20. hasrbeenzprelimi-x. narily machined betweenthecams and toipr'ovide end and center bearings": The .endstof: the shafti are also preliminarily-,1 scored at their; centers,

while the flange of the camshafitiszprovidedi with anaperture radially offset-from thecenter' ofthe shaft. "Theme-am is then 'p'ositionedzinto the machine; by;.withdrawing:.theatailistocky 1:'7,-;:then placing therscoredjcenter-pfi one end ofithe ishaftf against the pointed centeriof theheadstock; liGtfi-ik-S s: element 1:6 and:v then guidingntheacamx shaft. fihge,.;so that its aperture .iitsssnugly over the projecting pin 22 on the headstock 16i.-.-"I'l -1e;cen-. tral hearing: of" the cam sh'aftis then loweredsinto engagement with the: .lowier. half? or "the: bridge bearing. 76,. whereupon? the frail stockrlfi is ad vanced by turning themand wheel 117 1.130 bring thepointedxcenter ofthe tailtstock into the sco'red center at the adjacent'gendof the camshaft. The hinged cover flfierisitheni swung over the center bearing'of the'cam shaft. c-iThiS operation of inserting the cam shaft-to be. milledisiqui-te simplein practice and the rotatinghead-stockand other mechanisms of 1 the machine-need not' be stopped toeither withdraw .the finished cam shaft or .insert .alnew one. on the headstock intoithe aperture of the camfiange is. readily done by..afifeeling ioperation after; the scoredv center of the camshaft end is placed upon the pointed center: ofithe' head stock. The outward and. inward movement' of thei tail stock is also quickly secured'by 'spinning the hand wheel 17*, while the:- semicircular cup on "the bridge; bearing "16 for'the center bearing of the cam shaftprovides a ready means for guiding-thecam shaftcafter the pin- 22" has been inserted in the aperture. in the cam shaft flange and the camshaft accordingly rotated; Moreover; this bear ing 76 soholds the rotating camshaft that the-- pointed center'of the tail stock accuratelyseats in the scored center of the adjacent 'end -of 'the cam shaft. The milling cutter's' 62' are normally moved laterally awayfrom the work, and accordingly. do. not interfere with the: removal fof a finished camshaft or the insertion of a neW- one,--'

but in an effort to safeguard the-workmen, I pref erably provide guards 7 7 in: spaced relation around the upper portions of the milling cutters while they are in their outermost positions- (note Figure 5). I I

After the master cams 43 have been secured'inproper relation upon the shaft 42, the profiling operation of the several cams oneach cam shaft 20.is= substantially automatic'.- The 'shaft-42 car rying the master. cams 43 1s geared for 'sirnulta-- necus rotation from the same shaft that drives Simultaneously the several milling cutters are be ing rotated at desired speeds through the shafts 53,,and the heads18 .carrying the'milling cutters are reciprocated longitudinally. iOf themachine through the grooved cams: 4'7 and associated mechanism. Preferably one. of the-heads. I8. is. slid. toward the head stock-from .the initial posi-. tion shown inFigure-L to thereb'yzmill the-profiles. 7Q; ofv the cams. at. the right? of: the :m-illingcutters in:

The locating'of the pin 22 followedi'byi'a comparatively. rapid return, though.. otheriarrangementsmay be made to suit the con-,

ditions of'the-work.:being..milled.. If desired, the

rotating parts; may beautomatically stoppedafter thecompletion of'theprofilingoperation on each cam! shaft .or'other work 'anduthe work removedandxireplaced: whilei 'the rotating mechanism isstopped. However, byproperly timing the remoyingsandreplacing operation withthe return of ":the milling cutters tosoriginal :position. by the grooves .inithe cam drum'47, I am enabled to keep therotating. elements in constant motionfor long periods of time. Figures .12 and. 14, inclusive,

Ihave shown an embodiment of my invention that is' particularlyuseful with cam shafts that are of: comparatively greaterlength and relative --.s1enderness,."such for example as the cam shaft-for eight cylinder engines. In this embodiment, I drive both ends. of the. work being milled; and as .herein shown, the con nection for driving the tail: stock is from the shaft42' carrying; the master cams 43' and pinion 45 in my first .describedembodiment. The shafit 42. is made of requisite thickness. and strength to accommodate driving the tail stock of my improved: machine, and. adjacent its opposite ends it carries. the worm gear 41 and the spur gear'78 =(note Figure 12). Thegear. '78 is comparativelywide and. meshes with the narrower" pinion 79 .securedlon. the rotating portion of the tailstock :80,"which. is mounted in suitable bearings-81in the framework of the machine. The forward extremityof the tail stock is herein shown as provided with a recess ear the reception of a spring-pressed plunger 82, which is maintained bythe ,coil spring .83 normally beyond the remainder-ofthe tail stock except when in engagement with, the. work to be milled. This plunger 82 is within the hollow 'center of a spring collet 95 (note Figure 12) having inclined outer surfaces on its spaced jaws which cooperate with the tapered forward extremity of the barrel portion 80.of=the' tail stock, so as to firmly grip the adjacentcam extremity or other work to be milled in the-usual manner of spring collets whenever the collet is thrust'forwardly into engagement with the tapered forward extremity of the barrel. To

move, the spring collet longitudinallywithin the barrelasdesired, I have provided the rear-extremity of ,the .collet with a central threaded aperturewithwhich cooperates the threaded forwardportiono-f the shaft 85, which ,carriesat its v rear extremity a hand wheel 84, and is provided intermediateits endsv with a collar 96 which abuts against a washer 97 secured at the extremity of the barrel ,80 so as to prevent traveling of the shaft 85 when the hand wheel is rotated. Accordingly whenever the hand. wheel 841s turned in one direction, its threaded portion will'cooperate with the threaded portion of the collet so as to movethe collet towardtherear extremity of the barrel 80, and so withdraw the spring jaws of the collet from engagement with the a work being milled, while rotation of the hand wheel in the opposite direction williserve to advance the collet within the-barrel 80 toagain clamp. the jaws-about the flange on the work in contact the head stock. I

As best illustrated in clamping it in any adjusted position.- In .this'construction the tail stock is provided with a flared side portion. 80 fitting in a fixed dovetail groove 86 at its lower extremity and cooperating witha flared pivoted clamping member -8'7-. at-.its.upper extremity. The central portionof the side portion 80 of the tail' stock carries a rack-88 which meshes with a pinion ;89 carried at the lower extremity of the. vertical shaftr91, .whichis-ajour-g naled in a hollow externally threaded sleeve 90 which sleeve threads within an internally threaded bushing 98 fixed within an apertureiin the frame work and providedwith a bottom flange 99 arranged to prevent upward travel of. the. bushing.

when the sleeve 90 is rotated. The upperlex-i tremity of the sleeve 90 is'provided with a polygonal portion about which fits the hub ofv a handle 92, and just below such. polygonal portion the sleeve is provided with an outwardly flanged portion having a rounded lower edge which fits within a recess in the pivoted clamping member 87. The verticalshaft 91 carries a handle 93 at its upper extremity in any suitable manner..

By virtue of this construction, when the handle 92 on the sleeve is partially rotated" the'sleeve rides upwardly within the bushing 98, releasing the pressure formerly exerted upon-the clamping member 87 through .the flange 94Iof the sleeve. With the pivoted clamping member 87 thus loosened from the tail stock rotationof the shaft handle 93 will rotate the pinion, 89, and through the rack 88 will cause the longitudinal movement.

of the tail stock. When the desired new. position of the tail stock has been reached the sleeve handle 92 is turned in the reverse direction, whereby the sleeve 90 is drawn downwardly .within the bushing 98 and exerts pressure through the flange 94 upon the pivoted clampingmember, 87 to again clamp the tail stock in the adjusted position.

It will accordingly be evidentthat with vari-;

Suitable lubrication for the several rotating parts and coolant for the cutters are supplied in the usual manner or in any desired manner. It will be noted that thebearing 76 for'the' center bearing on the cam shaft 20, is bridged over from the sides of the machine framework so as to permit the liquid lubricant or coolant to fiowwithout interruption. v

While it will be apparent that the illustrated embodiments of my invention herein disclosed are well calculated to adequately fulfill the ob jects and advantages primarily stated, it is to be understood that the invention is susceptible to variation, modification and change within the spirit and scope of the subjoined claims. I claim:

1. In a milling machine, the combination aligned head stock and tailstock for receiving.

Figures 12 to 14 .I'have'. also provided novel means for readily moving'the: tail stock longitudinally of the. machine andv work to be milledyapair of longitudinally slidable heads arranged :in spaced relation with re spect tosaid stocks;-:a plurality of 'milling cutters arranged and 'laterallymovable in each of said heads, cam and lever means for independently moving each of said milling cutters laterally to and from the work-longitudinally sliding the heads and rotatably driving said cutters, all actuable from asingle source of power.

2. In amilling machine, the combination of a rotary work'holder, aipair of longitudinally slidable .heads .mounted at the sides of the work holder, a plurality of milling cutters mounted and laterallyimovable in ea'ch head, means-for sliding said-heads, means for rotating the milling cutters, and cam and levermeans for laterally moving the milling cutters during the longitudinal sliding movementsof said heads.

3. In a milling machine, the combination-of a rotary work holder, a pair of slidable heads mounted at the sides of the work holder, a plurality of millingcutters mounted in each head and independently transversely movable with respect thereto, means'for sliding said heads in opposite directions, a rotatable master shaft, a plurality of master cams .removably mounted thereon, means for rotating the milling cutters while said heads are being slid, and means controlled by said master camsv for independently moving the milling cutters transversely of said heads, including a plurality .of levers fulcrumed intermediate their ends; and eachhavingone of its extremities secured. to one of the milling cutters, and its other extremity in constant contact with a master cam.

4.. Ina milling. machine, the combination of a rotarywwork holder, a pair of slidable heads mounted at the sides of the work holder, a plurality of milling? cutters mounted'in each head movable transversely thereof, and each comprising a rotatable shaft, a slidable quill in which the shaft is rotatably mounted,,and a collar adjustably mounted on the quill, a rotatable master cam shaft, a plurality of master cams removably mounted thereon, and means controlled by said master cams and connected with said collars for independently sliding the millingcutters transversely of the heads. r

.5. Inamilling machine, the combination of a rotary ;work holder, 'a pair. of slidable heads mounted at the sides of the work holder, a plurality of milling cutters mounted in each head movable transversely thereof, and each comprising a rotatable shaft-,a slidable quill in which the shaft is rotatably mounted, and a collar adjustably mounted on the quill, a rotatable master cam shaft, a plurality of master cams removably mounted thereon, and means controlled by said master cams and connected with said collars for independently sliding the milling cutters transversely-:of'the heads, comprising-a plurality of levers having their extremities respectively engaging said master cams and collars.

6. In a milling machine, the combination of a rotary work holder, a pair of slidable heads mounted, at the sides of the work holder, a plurality of milling cutters mounted in each head movable ,transverselythereof, and each comprising ,a rotable shaft, a slidable quill in which the shaft is rotatably mounted,.and a 'collar adjustably mounted'o'n the quill, a rotatable master cam shaft; a plurality of master cams removably mounted .-;thereon,' means controlled by said master cams and connected with said collars for independently sliding the milling cutters transversely; of the heads, and means for driving the several rotatable elements from a single source of power.

7. In a milling machine, the combination of a rotatable work holder, a pair of slidable heads at the sides of the work holder, a plurality of milling cutters rotatably and transversely slidably mounted in each head, a master cam shaft rotatably mounted below the work holder, a motor, means for driving the work holder, master cam shaft and the milling cutters from the motor, means comprising a drum cam actuated by the master cam shaft for sliding the said heads longitudinally of the work,v and lever means also actuated thereby for sliding the milling cutters transversely of said heads.

8. In a milling machine, the combination of a rotatable work holder, a pair of slidable heads at the sides of the work holder, a plurality of milling cutters rotatably and transversely slidably mounted in each head, a master cam shaft rotatably mounted below the work holder, a motor, means for driving the work holder, master cam shaft and the milling cutters from the motor, means including a pair of cam drums rotated from the motor for sliding saidheads, and means actuated from the master cam shaft for independently sliding the milling cutters transversely of said heads.

9. In a milling machine, the combination of a rotatable work holder, a pair of slidable heads at the sides of the work holder, a plurality of milling heads, including a plurality of levers pivoted intermediate their ends and each having its upper extremity connected with a non-rotatable portion of a milling cutter, and its lower extremity 20 in contact with a rotatable portion on the master cam shaft.

WILLIAM SINCLAIR.

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