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fhg. s, 1946. ’ QH. SCHURR' - f 2,405,522 MACHINE TOOL Filed April l. 1942 » 7 Sheets-Sheet -1 l E. Hfs ATTQHNEYS. A|l8~ 5, 1946- l i c. H. scHuRR MACHINE' TOOL 1 2,405,522 ` Filed `April l, 1942 t '7.Sheets-Sheet 2 Fis. 5 ÍNVEÑTOR: am., Hfs ArronNsvs. Aug» 6» 1946. v _ c. H. scHuRR ~2’405’5j22 MACHINE TOOL Filed April 1, 1942 ' 7 sheets-sheet :s F76. 3 @Vm/¿M+ -H/s ATTORNEYS. c. H. sca-MRR ‘ MACHINE . 2,405,52 TOOL ì Filed April 1, 1942 '1 sheets-shew 4 ` (O T4 à* @mam Aug. 6,> '1946. c. H. scHuRR - 2,405,522 MACHINE 'TOOL Filed April l. 1942 '__ __ '7 sheen-sheet 5 ¿.....__ r £75.12 ¿if 3%@ 60%.? @MS .ì n 70E/VE,” CALH. SCHURR MACHINE TOOL I FilÀed April l, 1942 .HA/S '7 Sheets-Sheet 6 A TTOENEYS Patented Aug. 6, `1946 2,405,522Í UNITED STATES lTE'E‘ OFFIC 2,405,522 MACHINE TOOL Charles H. Schurr, Cleveland, Ohio, assigner ’to The Lees-Bradner Company, Cleveland, Ohio, , a corporation of Ohio Application April 1, 1942, Serial No. 437,112 17 Claims. 1 This invention relates to a machine tool, and particularly to a tool which is adapted to the accurate forming of surfaces .on metal and like materials. An object of the invention is to provide an improved machine tool -which will form non-cy lindrical surfaces with extreme accuracy. Another object is to provide an improved ma chine tool which will be of simple and rugged construction. Another object is to provide an improved ma chine tool which will require relatively few mov ing parts. Another object is to provide an improved ma chine tool which will have extremely little back lash or looseness. Another object isto provide .an improved ma chine tool which will occupy relatively small iioorl ,i space. Another object is to provide an improved 1na~ chine> tool which will ybe neat and compact. Another object is to provide an improved ma chine tool which may be easily operated. Another object is to provide an improved ma- chine tool which may be quickly and easily ad justed to accommodate itself to performing differ ent operations. Another object is to provide an improved ma chine tool which maybe readily and economically manufactured. Another object is to provide an improved ma chine tool which shall be both quick and eiilcient in its operation. i (Cl. 90--11.62) 2 scale than `that to which the parts are shown in the preceding ?lgures; Figure 8 lis an enlarged fragmentary cross sec tional view of the automatic feeding device taken on the line VIII-VIII of Figure 4; Figure 9 is a fragmentary sectional view taken on the line IX-IX'of Figure 3; Figure 10 is a fragmentary sectional view taken on the line X-X of Figure 3; Figure 11 is a diagrammatic view of the various driving connections ofthe apparatus of the pre ceding figures; and Figure 12 is a diagrammatic illustration of the ` electric circuits involved. Figure 13 'is a View partly in plan and partly in section, taken on the line XIII-XIII of Figure 1; and Figure 14 is an elevational View, partly in sec tion, taken on the line XIV-XIV of Figure 13. 20 In Figure 1, the machine is >shown as having a supporting base or pedestal I, this conveniently being,as shown, a hollow casting opening toward its bottom and having -spaced top walls 2 and 3 . and transverse webs‘or walls 4, 5, 5, 1 and 8, and 25 front and 'back walls 9 and I0. ‘Upon the upper surfaces of the top walls 2 and y3y -are formed, integrally therewith, longitu dinally extending Ways I I and I2. Extending along the front, rear, vand one end 30 of the base is a trough I3, formed integrally there with, whichfopens into a central depressed space between walls 6 and 1, these walls being provided with horizontal lianges I4 and l5 upon which a Other objects will hereinafter appear. rectangular container IB is supported for the re The invention will be better understood from 35 ception of chips, this container being movable like the description of one practical embodiment thereof, illustrated in the accompanying draw ings, in lwhich: Figure 1 is a front elevational view of a ma a drawer into and out of the space between'the walls 6 and 'I for convenience in 'removal of the chips. Mounted upon the ways II and I2 are a work chine tool, the type chosen for illustration being 40 head and a cutter head. that commonly called a thread milling machine, The latter is shown to the right in Figures 1 embodying the invention, parts of the base being and 4, and consists of a supporting bracket in broken away; dicated generally at I'Iprovided with bearings I8 Figure 2 is a transverse fragmentary sectional and I9 in which is supported, with its axis gen View taken on the line II-II of Figuij’e 1; 45 erally parallel to the ways, a tool spindle 20. Figure 3 is apartially elevational and partially The end .of the tool spindle projects at 2| be transverse view taken on the line'III-III of Fig ' yond the end 0f the base and is provided with a ure 1; ' pulley 22 keyed to it and -held upon the tapered Figure 4 isa longitudinal _sectional view taken end 2| of the spindle as by a nut 213, this pulley on the line IV-IV of Figure 3; 50 being shown as grooved for the use of a double Figure 5 is a iragmentaryisectional View taken V-belt 24. on the line V-V of Figure 3; ' The belt is driven from a pulley 25 fixed to the Figure 6 is a fragmentary sectional view taken shaft of a motor 26 located within the space in on the line VI-VI of Figure 3.; ` the base'deñned by walls 'l and 8,'top >3, and be Figure 'l is a plan View of a machinel to 'a smaller 65 tween fr'ont 9 and back 1U. 2,405,522 3 The pulleys and belt are protected by a cover 21 secured to the base and the work head by screws 21a. The spaces between the spindle and head are covered by rings 28, 29 and 38, which retain lubricant in the bearings, and prevent theentry of chips, dirt, and the like. Journalled in the cutter head is a transverse 4 12 in axial alignment therewith and provided with a skew gear 13. The clutch member 88 may be moved in either direction by a yoke 14 carried by a vertical shaft 15 which extends upwardly through the top of the frame and is provided on its outer end with a hand lever 16. On the rear part of the frame is hinged at 11 a bracket 18 carrying a motor 19, the shaft oi wheel 32 and having keyed to it a skew gear 3 . 0 which is provided with a pulley 88 over which pass This meshes with a skew gear 34 keyed to a V-belts 8l to a pulley 82 fixed to a longitudinally lead screw 35 which extends lengthwise of the _ extending shaft 83. machine to substantially the remote (or left This shaft has secured to it a skew gear 84 hand) end of the bed. The lead screw is pre meshing with skew gear 13, and at its outer end vented from axial movement by thrust bear~ detachably connected to it one of a series of ings 38. , ' > change gears 85 which drives, through an idler The work head is shown to the left in Figures , gear 86, another change gear 81 detachably se l and 4, and includes a carriage 31 slidable upon cured to the shaft 88 which in turn has formed ways Il and l2.v The carriage has’a depending upon it a worm 89, the latter meshing with worm boss 38 in which is secured a nut 39, engaging the wheel 10. 'j threads 48 of the leadÍscrew 35, by which the 20 Thus, it will be apparent that the work spindle carriage may be moved upon its ways. may be driven at either of two speeds, controlled A locking screw and handle 4| are provided by the position of lever 18. for clamping the carriage at any desired adjusted If the jaw clutch 89 is engaged, the drive is shaft 3l provided on itsI outer end‘with a hand from motor 19 through pulley 88, belts 8|, pulley The upper surface of the carriage is formed 25 ' 82, shaft 83, change gears 85, 88, and 81 to shaft 42 and 43, upon which is ‘ with transverse-,ways 88, thence through worm 89 to worm wheel 1E] position. , , K slidably mounted a'transversely movable slide 44 having a'flat upper surface provided with a cen~ which is now clutched to the shaft 63 and so in turn drives the worm 62, rotating the gear 80 and tral circular depression 45. with it the spindle at a speed suitable for cut The lower surface of the slide has a depending 30 ting. boss 48; movable in the space between the ways 42 As the spindle rotates, the threaded ring 58, and> 43, provided with a nut 41 engaging the traveling upon the ’fixed shoe 58 moves the spindle threads of a screw 48 for moving the- slide upon axially by an amount determined by the lead of the carriage, 35 the threads of parts 58 and 58. If a different L'I'he operation of this screw will be described more fully hereinafter. K ` ' Upon the upper surface of the slide is a frame 49 having a circular plate 5i) attached to it, this vfitting closely within the recess 45 so that the axial feed is desired, these two parts may be read ily replaced by others having the proper lead. If, however, the lever 16 is moved in the oppo site direction, it disengages jaw clutch t9~ and engages friction clutch 1I. Now power is trans frame Ymay be angularly adjusted with respect to 40 mitted from shaft 83 through skew gears 84 and Vthe slide. This adjustment is permitted by ma 13 to shaft 12, through clutch 1l to shaft 53, and chine screws 51 threaded into the slide and ex tending through arcuate slots in the lower portion it will be apparent that the latter now is driven at a substantially higher rate of speed than when of the frame 49. the jaw clutch is engaged. The frame carries spaced bearings 52 and 53A, 45 It also is driven preferably in a reverse direc in which is rotatably and slidably mounted a hol tion, thus providing a quick return, moving the low work spindle 54. This spindle on .its end spindle to its initial position. adjacent the cutter head has an outwardly ex In practice, a spring is provided for rotating tending iiange 55 which limit-s its axial motion shaft 15 in the direction to engage the jaw clutch 5.0 elements 89, so that the operator may move the inone direction. At the other end the work spindle has keyed lever into position to engage the friction clutch to it a removable externally threaded ring 55 held 1|, and, when the return motion has been com in place by an internally threaded ring or nut 51. pleted, merely releases the lever, whereupon the Theexternal thread of ring 58 is engaged by spring will cause the engagement of the jaw clutch a conjugate thread cut into a segmental shoe 58' 55 elements 89, so that he need not hold these ele detachably secured to the frame by screws 59. ments engaged while the cutis being performed. Also keyed to the exterior ofthe spindle 54 is A brake 98 is provided on a shaft 83, this being a gear 88, held in place by an internally threaded electrically controlled to stop the parts, as will be ring or nut'8l, which gear meshes with a worm . 82 formed integrally with a transversely extend 60 more fully described hereinafter. The forward end of screw 48 is journalled in ing shaft'53. the carriage 31 as indicated at 9|, the screw hav This shaft is supported at its forward end in ing a shoulder which abuts the journal and so bearings 54 carried by the frame, the end of the shaft projecting through a cap 85 and being 65 limits its outward movement. Beyond the journal the screw shankA is sur» squared, as indicated at t5,> for the application of roundedby a compression spring 92 bearing at a wrench or the like in effecting adjustments. one end against a collar 93 secured to screw 48 Shaft 83 is journalled at 51 within the frame and has splined to it a clutch member 68. This clutch member is provided on one end with a jaw clutch element 69 engageable with ’a correspond ing jaw element fixed to a skew gear 18. AThe other end of clutch member 68 is arranged to cooperate'with a disc friction clutchfil,> by which the shaft 83 may beconnected with a shaft and at its` other end against a flange 94 formed within a sleeve 95, the other» side of this flange bearing upon a thrust bearing 95, which, in turn, abuts the journal 9i.' The outer end of the screw is squared as indi cated at 91 for the reception> of a hand wheel, crank,` or the like, byfwhich thescrew may be 2,405,55221' 5 rotated ~for adjustments, or, if desired, »to impart a »manual feed. Y ' , , A depending -boss 9’8`is formed integr-allyA with the sleeve 95 and enters a groove in a cam 99. 6 load circuit breaker |53, to the coil |54 -con-` trolling the magnetic switch |31, the circuit con tinuing through conductor | 55, a second thermal overload switch I 56, and a conductor |51, back The cam is secured to a short vertical shaft H38 which is pivoted` in a casing I?I secured to the tothe end of line |36. front of the carriage. l _Fixed -to the cam is a worm wheel |92 mesh- ` button It@ is depressed to'complete the circuit, current flows through switch M9, conductor 15H3, y ri‘hus, it will be seen that when starting push ing with the worm |63 upon a shaft | 6d. push button I 5| , thermal overload circuit breaker To the outer end of the shaft is attached a l0 |53, solenoid |5fi, conductor |55, thermal >over change gear I |35' meshing with a change gear |66 detachably íixed to a short horizontal shaft |01, the inner end of which is provided with a worm wheel |68 driven by the worm |09 formed in the shaft ||ï| of a motor I||. ' Fixed to the other end of the motor shaft is a brake I I2. v The functioning of these parts will more fully appear from the description of the operation of the machine. - It will be noted that the motor 2% is mounted upon -a plate H3, pivoted at |||i within the base, and having supporting screws H5 threaded through its free end, whereby the amount of weight imposedupon belts 2d may be adjusted to load switch iäß, conductor |51, back to the main line conductor |3ë, closing the contacts of the magnetic switch |31, and energizing conductors |38, i3@ and Mil to operate motor 26. The clos 15 ing of the magnetic switch also connects line Hill with conductor |52 in parallel with start button M9 and acting as a hold in when the butto-n is released.V When it is desired to stop the motor 26, the push button |5| may be actuated, breaking the circuit and discontinuing the currrent to the coil i5@ and so permitting switch |51 to» open. Connected to the opposite Contact of switch |5| from conductor |52 is a conductor |53, one end of which is connected. to switch |22. It is maintain these belts at any desired tension. provided with a branch conductor |59 having its The recess between walls 6 and 1 terminates at end connected to switch |25 and having another a nearly horizontal bottom wall IIS which per branch conductor me connected to switch |33. mits coolant lluid to iiow down into a sump ||l It will be noted that conductor |53 may b-e formed in the rear of the base. 30 energized by closing the starting switch MQ and A cam |20 is i'lxed to Shaft 15, and two switches is de~energized simultaneously with coil i’öéi by |2| and |22 are arranged to be valternately actu the opening of switch 55|, so that the start and ated by this cam as the lever 16 is moved from stop switches control all the circuits supplied by one side to the other. current through conductor |58. The external surface of cam 99 is formed into From the other terminal of switch |22, a con an additional cam surface contacting the Vend of ductor |e| extends to one terminal switch |32, a horizontal rod |23 provided with two adjustable and from another contact of this latter switch a conical collars |2¢| and |25 which are respectively conductor |62 is connected to a conductor |63 arranged to actuate switches |25 and |21 in ac having one end connected to a terminal of switch cordance with the rotation of cam 99. 40 |2| and its other end connected to a terminal A forked follower I28'embraces the gear Sii, this switch |21. follower being ñxed to a rod |29 provided with From the third terminal of switch |32 a con two conical collars |36 and ISI, thesebeing posi ductor Hill extends, being attached to a con tioned to `actuate switches |32 and |33, respec ductor |55, one end of which connected to the tively. other terminal of switch itl', and the other end Thus, it will be seen that the switches |2I and of Ywhich passes through a thermal overload |22 are controlled by the position of the lever 1d; switch |56, the coil |i¥1 of a magnetic switch |58, |26 and |21 are controlled by the position of a thermal overload switch |69, and a conductor cam 99, and, consequently, in accordance with |10, which is` connected to one end of line IÃ1|, the position of the slide upon the carriage and the other end of which is connected to line |35. switches |32 and |33 are controlled by the axial Lines |12 and |13 connect, respectively, lines movement of the spindle in its bearings. |35 and |34 with the magnetic switch |65, and The switches and motor are connected as indi through the magnetic switch to conductors Hd, cated in Figure 12. ’ |15 and |15 connected to the motor |||. Branch Current is supplied from a power line or gener 55 conductors |11 and |13 connected, respectively, ator through conductors |34, |35 and |36, pass to conductors |1|| and |16, extend to the ends of ing through a magnetic switch |31 to conductors the coil |19 of the magnetic brake H2. I 38, |39 and läd, which connect, through a manu A conductor lâ@ connects the second end of ally operable reversing switch indicated generally switch |2$ with line H53. ' at I4I, with conductors M2, |43 and IM, respec 60 A conductor I 8| connects the second contact tively, connected to the motor 26. of switch |2| with the second contact of switch Also connected to the switch |31 are conduc tors |45, IME and |41 connected to motor H9, so that whenever the magnetic switch |31 is |33. l A conductor |82 extends from a third contact of switch |2| to a thermal overload relay |83, closed the motor HS operates, supplying coolant 65 thence to the coil |86 of a magnetic switch |85, to the cutter. a second thermal relay iii, anda conductor |81 Connected to one terminal or" line |315 is a con connected with one terminal of line ißt, the ductor |63 which extends to a normally open other end of which is connected to line i3d.l starting push button M9, the other side of this Lines |89 and No connect, respectively, lines button being connected by a conductor |53 to a 70 |35 and |34 with the magnetic switch iß’â, `while contact of a normally closed stopping push but lines |9I, |92 and ISS connect the corresponding ton |5I, and from this same contact of the sec ond push button a conductor |52 passes to the terminals of this switch through a manual re versing switch |94 to the terminals of motor 19. switch |31. From the other side of stop button Branch conductors |95 and |95 connected, re -I'5I current may pass through a thermal over 75 spectively, to conductors -|9| and |93, are con# 2,405,522 brake 96. 8 .The release Of 'the lever, of- course' opens switch |22 but this does not effect the operation, inasmuch as the circuit controlled thereby has nected to the ends of> the coil |91 of magnetic Y ` Thus, it will be apparent that current is sup been broken at switch |32. plied to motors 19 and ||| only after the actu ation of the starting switch |49, and that such current is discontinued by the actuation of the Y The actuation of switch |32 has now es tablished a circuit between conductors |62A and |64, thence through conductor |65 to coil |61 of magnetic switch |68, again closing this switch . It will also be apparent that coils |19 and |91 and energizing motor || | to feed the cutter in to are energized to retain their respective brakes ||2 and 96 in inoperative position only while the 10 depth, this motion, of course, being likewise im parted to the cam 89 and moving abutments |24 motors 19 and ||| are operating. and |25 .to the right, as seen in Figure 12. At The operation of the device is as follows: The the extreme position of these abutments, they operator presses the start push button |49 which open switch |26 and close switch |21. permits current to flow through the magnet |54 The opening of switch |26 breaks .the circuit of switch |31, closing this switch and supplying 15 between conductors |59 and |63, .discontinuing current to motors 26 and ||9. the current to both coils |61 and |84, and stop It simultaneously supplies current to line |58. ping both motors ||| and 19, at which time the After inserting a piece of work in the chuck parts have progressed to their positions at- the |98 and clamping it by rotating hand wheel |99, the operator moves lever 16 to his left, closing 20 iinish of the cut, and it is time for the operator switch |22 and permitting switch i2| to establish v to replace the work piece with a fresh one. It will :be noted‘that neither of .the feed motors a connection between conductors |8| and |82. 19 and | | | can be operated until the cutter motor At this point of the operation, switch |33 is 26 has been started, thus insuring that the oper closed, so that current may flow through con ductors |59 and |66, switch |33, conductor |8i, 25 ator will not start the piece ñrst and force the cutter and work into each other beforethe cutter switch |2| and conductor |82 to energize the is rotated. coil |84 of magnetic switch |85, starting the ino While I have described the illustrated embodi tor 19. ment of my invention in some particularity, ob Simultaneously, current passes through switch |22 and thence through conductor |6| to switch 30 viously many others will readily occur to those skilled in this art, and I do not, therefore, limit |32, then through conductors |62 and |63 to myself to the precise details shown and described, switch |21 and through this switch to conductor but claim as my invention all embodiments, var |65 connected to coil |61 of magnetic switch iations, and modifications thereof coming within |68, closing this switch t0- energize motor ||| which retracts the cutter from depth so that it 35 the scope of the appended claims. ~ I claim: Y Y will clear the work during its return to its start 1. A machine tool comprising a tool holder, a ing position. rotatable work spindle, means for rotating said As the motor | | | rotates to retract the cutter, spindle, the tool holder and spindle being rela cam 99 rotates, moving rod |23 to the left, as stopping switch |5|.- _ seen in Figure 12, so that when the cutter is 4.1' tively adjustable axially, radially, and angularly, an externally threaded ring detachably secured fully retracted the cam will cause contact |25 to to the spindle, a segment having a thread con open switch |21 and contact |24 to close switch |26. The opening of switch |21 breaks the circuit between conductors |63 and |65 and stops the motor |||. ' Motor 19 continuesV to operate, moving the spindle to the left and carrying with it contacts |38 and |3|. jugate to the thread on said ring, and detachable securing means fixing said segment relative the tool holder, the threads of the segment and ring being in engagement. 2. A machine tool comprising two independ ently rotatable spindles, driving means connect ed to one of said spindles, separate driving means When the spindle has reached its extreme po 50 connected to the other spindle, feed means ca pable of relatively moving the spindles actuated sition, these contacts will have moved switch |32 to-establish the circuit between conductors |62 and |64, and have reopened switch |33, thus breaking the circuit between conductors |66 and |8| and discontinuing current through the lat ter to switch | 2|, conductor |82, and coil |84 of magnetic switch |85, thus causing this magnetic by said second driving means, disengageable posi tive power transmission mechanism between the second mentioned driving means and the second mentioned spindle, a second disengageable power transmissionmechanism capable of transmitting motion at a dinerent rate of speed between the second mentioned driving means and the second mentioned spindle, and means for selectively al switch to open and stop motor 19. The operator then releases lever 16, and its spring swings this lever to his right. This mo 60 ternately engaging said power transmission mechanisms. tion opens switch |22 and establishes .the circuit 3. A machine tool comprising two independ between conductors |63 and |82. ently rotatable spindles, driving means connected Current now ñows through conductor |59, to one of said spindles, separate driving means switch |26, conductor |80, conductor |63, switch |2|, and conductor |82 to coil |84 of magnetic 65 connected to the other spindle, feed means ca switch |85, again closing this switch and causing the motor 19 again to operate. The operator’s action in releasing the lever and the rotation of this lever and its, shaft have caused the yoke 14 to disengage the quick return clutch 1| and lto engage the cutting clutch 69, so that the spindle is now driven in the opposite or cutting direction and 'at a lower rate of speed than was the case when the lever was retained by the operator to his left. pable of relatively moving the spindles actuated by said second driving means, disengageable pos itive power transmission mechanism between the second mentioned driving means and the second mentioned spindle, a second disengageable power transmission mechanism capable of transmitting motion at a different rate of speed between the second mentioned driving means and the second mentioned spindle, and means for selectively a1 75 ternately engaging said power .transmission 2,405,522 i9 10 mechanisms, a second` feed means capable of moving the spindles relatively'in a different di means for driving said spindles, a feeding element rection, and means controlling said second men tioned feed means in accordance with the opera tion of said power transmission mechanisms. responding feeding element in engagement there with and fixed with respect to said bearings, 4; A'machine tool, comprising a rotatable spin dle, driving means therefor, two power transmit ting mechanisms between said driving means and said spindle arranged to rotate the spindle at different speeds relative to that of the driving means, clutch means for selective alternate en gaging either of said transmissionV mechanisms, feed means actuated in accordance with the ro tation of the spindle, a second feed means, inter carried by said second mentioned spindle, a cor means for moving the slide on the carriage, and means for moving the carriage on the base. 9. A machine tool comprising a rotatable and axially translatable spindle, driving means there for, power transmission mechanism interposed between the driving means and the spindle com prising two gear trains, a jaw clutch between one lof said gear trains and the spindle, and a friction clutch between the Aother gear train and the spindle. ‘ , connections between said clutch means and said 15 lo. A machine tool comprising a rotatable and second feed means causing the latter to operate axially translatable spindle, driving means there in vpredetermined relation to the operation of the for, power transmission mechanism interposed power transmitting mechanisms. between the driving means and the spindle com 5. A machine tool comprising two spindles, a prising two gear trains, a jaw clutch between one motor arranged to drive one of said spindles, a 20 of said gear trains and the spindle, a friction second motor arranged to drive the other of said clutch between the other gear train and the spin spindles, two power transmission mechanisms in dle, and common control means for said clutches terposed between said last mentioned motor and permitting engagement of only one at a time. spindle capable of driving the spindle at different l1. A machine tool comprising a rotatable and speeds relative the speed of its motor, clutch 25 axially translatable spindle, driving means there means for selectively engaging either of said pow for, power transmission mechanism interposed between the driving means and the spindle com prising two gear trains, a jaw clutch between one the third motor actuated in accordance with the of said gear trains and the spindle, a friction clutch means, and control means fo-r the sec 30 clutch between the other gear train and the spin er transmission mechanisms, a feed means, a third motor connected thereto, control means for ond and third motors actuated in accordance with the operation of the first mentioned motor. 6. A machine tool comprising two spindles, a motor arranged to drive one of said spindles, a second motor arranged to drive the other of said spindles, two power transmission mechanisms in terposed between said last mentioned motor and dle, threaded means carried by the spindle, and stationary threaded means in engagement there with. » l2. A machine tool comprising a rotatable and axially movable spindle, a threaded element car-` ried by the said spindle, a stationary threaded ele ment in engagement therewith, a gear fixed to the spindle capable of driving the spindle at different spindle, a worm in engagement with the gear, and speeds relative the speed of its motor, clutch driving means for rotating said worm, a clutch means for selectively engaging either of said pow 40 between the worm and the driving means, and ing in accordance with the rotation of said sec manual means for rotating the worm. 13. A machine tool comprising a base, a slide ond mentioned spindle, control means actuated movably supported thereby, a screw for moving by .said feed means, said control means control the slide upon the base having a threaded por ' er transmission mechanisms, feed means operat ling the second mentioned motor, a second feed 45 tion engaging a threaded element fixed to the slide, a bearing stationary with respect to the base means, a third motor> connected thereto, control means for the third motor actuated in accordance supporting the screw, a thrust bearing between with the clutch means, and control means for the the screw and stationary bearing, a second thrust second and third motors actuated in accordance bearing on the opposite side of the stationary 50 bearing, a sleeve Ibearing upon said last men with the operation of the ñrst mentioned motor. 'î'. A machine tool comprising a base, stationary tioned thrust bearing and surrounding a portion bearings carried thereby, a spindle rotatably sup of the screw, a collar fixed to the screw within ported by said bearings, ways upon the base ex the sleeve, a compression spring interposed be tending in the direction of the axis of the spindle, tween the collar and sleeve, automatic means for a carriage slidable upon said ways, slide 55 moving the sleeve, and manual means for rotating mounted on the carriage and movable in 'a direc the screw within the sleeve. tion transverse to said ways, bearings carried by 14. A machine tool comprising a base, a slide the slide, a spindle rotatably and slidably’ï-carried movably supported thereby, a screw for moving by said bearings, means for driving said spindles, the slide upon the base having a threaded por a feeding element carried by said second men tioned spindle, a corresponding feeding element in engagement therewith and fixed with` respect 60 tion engaging a threaded element fixed to the slide, a bearing stationary with respect to the base supporting the screw, a thrust bearing between >to said bearings, means for moving the slide on the , the screw and stationary bearing, a second thrust carriage, and means for moving the carriage on bearing on the opposite side of the stationary the base. _, 65 bea `ing, a sleeve bearing upon said last mentioned 8. A machine tool comprising a base, stationary thrust bearing and surrounding a portion of the bearings carried thereby, a spindle rotatably sup screw, a collar fixed to the screw within the sleeve, ported by said bearings, ways upon the Ibase ex a compression spring interposed between the tending in the direction of the axis of the spindle, collar and sleeve, a cam connected to move said a carriage slidable upon said ways, a slide 70 sleeve, and manual means for moving the screw mounted on the carriage and movable in a direc within the sleeve. tion transverse to said ways, bearings carried by l5. A machine tool comprising a rotatable work the slide and angularly adjustable with respect spindle, a tool holder, driving means for rotat to the motions of the carriage and slide, a spindle rotatably and slidably carried by said bearings, ing the spindle about its axis, feed means actu ated by the rotation of said spindle for movingy 2,405,1522 11 the spindle and holder relatively in the direction of the axis of the spindle in two opposite direc tions, and independent feed means for moving the spindle and holder relatively in a direction trans verse to the spindle axis. _ 16. A machine tool comprising two rotatable spindles, driving means connected to one of said 12 17, A machine toolcomprising a rigid- station ary base, a spindle carried by said base and ro' tatable and axially movable with respect thereto, a threaded element detachably ñxed to said spin dle, a second threaded element having a thread conjugate to that of the iirst mentioned element and in engagement therewith fixed relative to said base, a holder carried by said base and iixed in relation thereto, and driving means connected to spindles, independent driving means connected to the other said spindles, feed means actuated by said second driving means for feeding the spin 10 said spindle, a Vrotatable spindle carried by the holder, and driving means for said last mentioned dle relatively in oneV direction, and control means spindle independent of said first mentioned permitting the second mentioned driving means driving means. ' to operate only while the first driving means is in CHARLES H. SCHURR. operation.