US1083554A - Automatic turret-lathe. - Google Patents

Description

W. L. MILLER.

AUTOMATIC TURRET LATHE.

APPLICATION FILED AUG. 31, 1911.

Patented Jan. 6, 1914.

8 SHEETS-SHEET 1.

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AUTOMATIC TUREBT LATHE.

APPLIOATION FILED AUG 31, 1911.

Patented'J an. 6, 1914.

a SHEETS-SHEET 2 y NN NH H o N o l\m .m' O O W 0 Q Q L m W. L. MILLER.

AUTOMATIC TURRET LATHE.

APPLICATION-FILED AUG.31,1911.

1,083,554, Patented Jan. 6, 1914.

8 SHEETS-SHEET 31 W. L'. MILLER.

AUTOMATIC TURRET LATHE. APPLICATION FILED AUG. 31, 1911 1,083,554, Patented Jan. 6, 1914.

8 SHEETS-SHEET 4.

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\ HIIHIII IHIIIIIII W. L. MILLER.

AUTOMATIC TURRET LATHE.

APPLICATION FILED AUG. 31, 1911.

Patented Jan. 6, 1914.

8 SEEETSSHEET 5.

W. L. MILLER.

AUTOMATIC TURRET LATHE.

APPLICATION FILED AUG.31,1911.

1,083,554. Patented Jan.6,1914.

W. L. MILLER.

AUTOMATIC TURRET LATHE.

APPLICATION FILED AUG.31, 1911.

Patented J an. 6, 1914.

8 SHEETS-SHEET 7.

'W. L. MILLER.

AUTOMATIC TURRET LATHE.

APPLIUATION FILED AUG. 31, 1911.

Patented Jan. 6, 1914.

8 SHEETB-SHEET 8 UNITED STATES PA TENT orricn;

WILLIAM L. MILLER, OF MADISON, WISCONSIN, ASSIGNOZB. TO GISHQLT MACHINE COMPANY, OF MADISON, WISCONSIN, A CORPORATION OF WISCONSIN.

AUTOMATIC TURRET-LATHE.

Specification of Letters latent. i

Patented Jan. 6, 1914.

Original application filed February 27, 1911, Serial No. 611,037. Divided and, this application filed August To all whom it may concern:

Be it known that 1, WILLIAM L. MILLER, a citizen of the United States, residing at Madison, in the county of Dane and State of \Visconsin, have invented certain new and useful Improvements in Automatic Turret-Lathes, of which the following is a specification.

This invention relates to metal working machines of the automatic turret lathe type, and has reference more particularly to the turret operating and controlling mechanism of such machines; a complete organized machine embodying my present improvements, together with analogous improvements in the operating and controlling means of the spindle and cross-slide, forming the subject matter of an application heretofore filed by me on the 27th day of February, 1911, Serial No. 611,037, of which application my present application forms a divi- The chief and most distinctive feature of my present improvements resides in a novel means, in an automatic turret lathe, for effecting the automatic control of the turretslide; such controlling means effecting the rapid 'or quick traverse movements of the turret-slide and the reversal of such movements; the changes from the quick traverse to the feed movements, and the variations in rate of such feed movements.

In the preferred embodiment of the in-.

through which the starting and stopping,

and the changes of speed and direction of movement, of the turret slide are effected. The shaft on which this drum is mounted is connected with the pulley or main driving-shaft of the machine through driving connections which are normally-idle, but are adapted to be rendered active by certain trip' devices automatically thrown into operationto move or index the drum around one or more steps by trips or projections carried by the turret slide, which latter is controlled as to its starting and stopping Serial No. 647,016.

movements, speed, and direction of movement, by the said intermittently moving cam-drum. By such mechanism, the operator, knowing in advance the various operationsto be performed by the turret tools upon a given piece of work, the tools to be used, and the proper feeds to be given to each tool, sets the cams ,on the drum accordingly'to. produce automatically the predetermined movements and speeds, places the work in the chuck, and applies the power to the main or pulley shaft. The machine thereupon automatically performs these several operations in proper order or succession, and automatically stops when the same are completed, leaving it to the operator only to remove the finished work andinsert in the chuck a.new piece of work.

considerably in respect to details within the scope of the appended claims; and referring thereto Figures 1 and 2 are side elevational views of the complete machine from opposite sides thereof. Fig. 3 is an en'- larged cross-sectional view'substantially on the off-set dotted line 3-3 of Fig. 1. Fig. 4 is a horizontal section through the machine showing in plan the change gear mechanism for securing variations in the fine and roughing feeds. Fig. 5 is an enlarged detail of the mechanism for transmitting oppositely rotating movements'from the pulley or. drive-shaft. to the intermediate shaft. Fig, 6 is an enlarged sectional detail showing the clutch-controlled transmission vfrom the intermediate shaft to the turret lead screw. Fig. 7 is an enlarged detail, partly in section, andpartly in elevation, showing the normally idle power transmission from the drive-shaft to the drum-shaft. Fig. 8 is a sectional detail on line-*8-8 of Fig. 9. Fig. 9 is a sectional detail on the line 9-9 of Fig. 8. Fig. 10 is an enlarged detail in cross-section through parts of the drumtripping mechanism. Figs. 11, 12, and 13 are enlarged detail elevations of certain of the shafts, their bearings and parts carried thereby employed in the tripping mechanism. Fig. 14 is an enlarged detail in vertical section showing the index disk, one of the blocks carried thereby, and its gearing g 19 is a similar view on the line 19-19 ofto the drum-shaft. Figs. 15 and 16 are detail elevations of the hoods covering the turret-controlling drum and the cross-slide and spindle-controlling drum respectively, and carrying the index plates that coiiperate with pointers on the several clutch-shifting levers. Fig. ,17 is a group view showing the several positions on the drum which each cam-block may assume, according to the particular operation to be secured thereby.

Fig. 18 is an enlarged sectional detail of av trip-block carried by the turret-slide. Fig.

Fig. 18. Fig. 20 is araenlarged sectional detail of a trip-block that coeperates with the trip shown in Figs. 18 and 19. F ig.21 isa similar view on the 'line 21-21 of Fig. 20. Referring first to Figs. 1, 2 and 3, 1 designates as an entirety the substantially rectangular frame or housing of the machine,

- surmounting which and extending the major part .of the length thereof are parallel V-shaped ways 2 (Fig. 3) that support the turret-slide 3, rotatably mounted on which latter is the turret-head'. At one endlof' the frame and disposed above the plane of the bed of the lathe is the head-stock mechanism designated as an entirety by 5, the

same carrying a spindle (S terminating at its mner end in a chuck "7 carrying the usual 'chuek jaws Slidably mounted on a carriage 9,, which, in turn, is itself slidablesidewise on the main ways 2 offthe bed, is a cross-slide 10 having the functions of the usual tool-carrying cross-slide that moves toward and fromthe workin a direction at right-angles to the bodily movements of the iturret 4 Extending lengthwise and subblocks 14, shown in detail in Fig. 17. These cam-blocks are .designed, as their respective drums are turned, to engage the lower ends of certain levers which throw into and out of action, and control, the speeds or rates of feed of, various operating parts of the machine; and each of these cam-bl ks is fornted with a relatively long incline face 14 and a shorter inclined face 14"; and each block is reversible as to its position on the drum so that it can engage the lower end of a lever on either side and by either'its long or its short face, thus making four positive positions -of each cam-block on the drum relatively to the lever which -it'gcon- -trols these four positions being illustrated in Fig. 17 The function of the longer side of the block is to shift the lever controlled thereby from one working position to the other working position, or from a central idle position to either working position; while the function of the short side is to I shift the lever from working position to the central idle position.

The cam-blocks of each drum eng'agezthe lower ends of a series of levers, which latter constitute direct a/ctuating means of a series of clutches through which the changes between the rapid traverse and feed movements, the variations in speed of the feed movements, and the reversals of direction of travel of the tool-" carrying parts are effected, as likewise the variations ,in the spindle speed. As the present inventionhas to do, however, only "with the turret-slide actuating and controlling mechanism in which the intermittent cam-drum 13 plays a part, the descrip tion will be limited to such parts of the mechanism as coiiperate directly or indirectly with the drum 13.

41 designates what I term an intermediate shaft that extends lengthwise of the machine bed, and carries a series of gears adapted to be clutched thereto through which the various roughing and fine feeds are transmitted to the turret slide, the relative position of said intermediate shaft being best shown in the cross-sectional view, Fig. 3. By means of certain of the levers controlled by drum 13 any one of four different feeds can be imparted to said intermediate shaft 41, and consequently to the turret-slide; and each of these feeds can be. independently varied as desired by manually manipulating certain change gears through which the intermediate shaft 41 is driven from the feed-shaft 73, as hereinafter described. Two of these cam-drum actuated levers designated by 55 and 56 are pivoted at 57 and 58, I

faced clutch-follower 63 on the intermediate shaft 41 and operating expansion ring clutches 64 and 65,- by which the wormwheels 66 and 67 are made fast with shaft 41; and the lever 62 similarly actuates a double-faced clutch-follower 68 in turn operating expansion- ring clutches 69 and 70 by which worm-wheels 71 and 72 may be mad fast with shaft 41. The several wormwhe s 66, 67, 71 and 72 are all constantly driven at different rates of. speed from the feed shaft 73 (Figs. 3 and 4), said fBQd'. shaft 73 being, in turn,'d riven directly from the spindle 6 by gearing or a link-belt (not shaft '73 carries double-faced bevel gears 77 (Figs. 3 and 4) driving bevel gears 78 on shaft 79, which latter drive parallel shafts 80 through change-gears 81 on the back of the bed, similar but independent sets of change gears being provided for each of the feeds carried by the machine. The shafts 80 carry worms 82 meshing with the several worm-wheels 66, 67, 71 and 72 and in varying ratios to the latter said wormwheels normally running loose on the intermediate shaft 41; and the change gear mechanism last described serves to provide a'considerable range for each of the four feeds for the turret slide. The intermediate shaft 41 is geared to the turret lead screw 83 by spur-gears 84 and 85 (Figs. 1 and 6) on said intermediate shaft and lead screw, respectively, the spur gear 84 on the intermediate shaft having a clutch-controlled connection with the latter, as hereinafter explained.

The rapid back and forward traverse of the turret is provided for by means of a pair of oppositely driven spur- gears 86 and 87, respectively, that are loose on theintermediate shaft 41 and are driven in opposite directions at a constant speed from the main pulleyshaft 33. Said pulley-shaft 33 has loose thereon a clutch-controlled gear 88 (Figs. 2, 3, and 5)-meshing directly with the back traverse gear 86 and 'a fixed gear 89 driving the forward traverse gear 87 through an idler'g'ear 90. These rapid traverse' gears 86 and 87 are thrown into driving engagement with the intermediate shaft 41 by a lever 91 pivoted at 92, its upper end engaging a double-ended clutch-follower 93 on 'theshaft 41 and operating expansion ring clutches within the gears 86 and 87, and its lower end adapted to be shifted by suitably positioned cam-blocks on the drum 13..v

For throwingthe turret slide into and out of,actioi1,"-the hub of the gear 84 has fast therewith one member 94 of an expansion ring clutch (Fig. 6,) the other member 94 of which is actuated by the clutch-follower 95 slidably. mounted on the intermediate shaft 41; and connected with said clutchfollower is the upper end of a lever 96 suitably pivoted to the 1 frame at 97 (Fig. 12),

. the lower end of said lever being connected by a link 98 with the lever 99, pivoted at 100, the lower end of said lever 99 lying opposite the drum 13 and adapted to be shifted by suitably positioned cam-blocks thereon,

4 whereby the rotation of the lead-screw of the turret may be automatically started\ and stopped at the desired times.

Describing next the mechanism for effecting the intermittent turning or indexing movement'of the drums 12 and 13, and referring more especially to Figs. 7 to9, 101 designates a worm-wheel fast on the drumcross-shaft 103 suitably journaled between the side walls of the frame or housing. Loose on the shaft 103 is a spiral gear 104 that is constantly driven from the main pulley-shaft 33 by spiral gears 105 and 106. The spiral gear 104 carries a steel ratchet 107 with internal notches; and keyed to the worm-shaft 103 is a dog-holder 108 which carries a pivoteddog 109, the teeth of which are normally held out of engagement with the ratchet-ring 107 by the lower arm of a yoke-lever 110 which engages the nose.of the dog, raising it sufiiciently to keep its teeth out of engagement with the ratchetring. This yoke-lever 110 isfast on a cross; shaft 111 mounted parallel with the wormshaft 103. When, however, by mechanism hereinafter described, the yoke-lever 110'is tripped so as to allow it to fall, the dog 109 is thrown into engagement with the ratchetring by a spring-pin 112 (Fig. 8) slidably. mounted in the dog-holder 108; and when this occurs the worm-shaft 103 is caused to make one revolution thereby indexing or advancing the drumshaft and drums onespace.

This drum-indexing movement is limited to a single space (except when the drums are indexed through several spaces by a single continuous movement of the drum-indexing mechanism as hereinafter explained) by a mechanism which automatically raises the yoke-lever 110 at the completion of a single revolution of the worm-shaft 103 and restores it to a position in which its lower arm nism that normally holds the yoke lever in raised position. This catch mechanism, in

the form herein shown, (see Figs. 10, 12 and 13) comprises the following parts.

114 designates an arm fast on and upstanding from the yoke-shaft 111 and carrying at its upper end a hardened steel block 115 that normally abuts against a corresponding block 116 carried by a horizontal arm 117 fast on another cross-shaft 118. 4

- Keyed to and depending from the shaft 118 is an arm 120 (Fig. 13),'the lower end of which is forked and carries a pin 121 which is flattened on two sides and constitutes a support for the free end of a flat rod 122, which rod is notched or shouldered on its under side to engage the vertical flat face of the pi 121 so as to swing the arm120 under long i dinal movement 1n one direction of the ro 122. The rod 122 is pivoted at its other end to a depending arm 125 (Fig. 11) carried by a shaft 127 mounted in the side wall of the.frame or housing (Fig. 1) the arm 122ext-ends above and across the wormshaft 11 driven by a worm 102 keyed to a jsha'ft 103, and the latter is provided with an eccentric 132 which operates to raise the rod 122' at the proper time to disengage its shouldered portion from the pin 121, and thus allow the catkfih-block 116 to drop into stop engagement with the catch-block 115, as shown in Fig. '10.

From the foregoing it will be seen that therod 122, when given a longitudinal move.

i is again thrown out of engagement with the ratchet-ring 107 by the engagement of the cam 113 with the upper arm of'the yoke and the latter is locked in its raised position by the cooperating catch-blocks 116 and J15. ,The means whereby this trip-rod 122 is thus actuated from the turret-slide will next be described.

Referring to Figs. 1' and 18 to 21 inclu ive, 135 designates a table mounted on oscillating links 136 pivoted on studs 137 projecting from the side wall of the casing;

the upper'surface of said table bein pro- .vided with a plurality oftparallel slo s 135 for an adjustable mounting therein of trip, blocks 138 and 139. The turret-slide is pro-, vided beneath each of the flat tool-"carrying faces with a laterally projecting bracket 140 formed with parallel slots 140. In one of these is mounted a block 141 having a tapered lower end 141 adapted to. engage the tapered upper ends of the blocks 138 and 139, thereby depressing the tableT'135 in opposition to a spring-actuated pin 142 which normally maintains the table 135 in raised position. The hub of the rear link 136 has a depending arm.143 which is connected by alink 144 with an arm 145 (Fig. 11) fast on the shaft 127; pinned to and depending from which latter shaft is the arm 125 carrying the trip-rod 122. Blocks 138 and 139 are set on the table 135 at positions. corresponding with those at which it is desired to arrest the forward rapid'traverse movements of the turret slide and throw in a feed movement, and arrest the latter and throw in the back traverse. In operation, the turret-slide moves forward under its rapid traverse movement until the block 141 engages the beveled top of the stop-block 138, which depresses the table and causes the trip mechanism for indexing the drum 13 to operate through the described connections, whereby, by cam-blocks suitably placed on the drum 13, the quick traverse motion is arrested and the proper feed engaged by one of the levers 55 and 56. The turret-slide continues then to feed forward until block141 comes in contact with block 139, whereupon, when the indexing mechanism is again trip ed, by suitably placed cam-blocks .on the um 13, the feed is disengaged and the back traverse motion is. engaged. The block 138 is pivoted and spring-actuated to normal position, as shown in Figs. 20 and 21, so as to yieldon its pivot when struck by the block 141 during the back traverse movement of the turret-slide without depressing the table 135,-

but block 139 may be rigid if desired. Hence, it will be seen that the first described mechanism (block 138) trips the drum-indexing devices on the forward motion only ofthe' turret slide.

I have herein shown a trip-block table having three slots for'trips in combination with. a turret having six tool faces. Of course, the trip-block table may be provided with as many grooves as the turret has faces but in practice this is not necessary for the following reasons: In doing most jobs there is,a roughing and finishing tool, of each 5 kind. For instance, there are always two boring bars which could use the same pairof stops in the same slot on the trip-block table.- The slight differences in the time of tripping in and out the roughing and finish-l ing tools being provided for by the adj ustmentl of the-brackets 140 on the side of the tur ret (Figs; 18 and 19) and the adjustment of the trip-blockf141 in'the b racket*140. Likea 'of the turret faces, it can be taken .care of in the construction shown in the following manner. Referring to Figs. 18 to 21 inclusive, it will be noted that the-tapered operative portion 141 of the trip-block '141 is a little less than one-half the width of the block ;also, that thetrip 138 lies to one 05.

side of the center of the" slot in the table 135.

Therefore, if face No. 1 of the turret head had tripping devices set as shown in Figs. 1-8. to 21, the next face of the turret brought into action could have a'trip-block 141 in the center slot of the bracket 140 but reversed, so that it would miss the trip block 138 set as shown in Fig. 21, but would act against anothertrip-block in the same slot of. table 135 but likewise reversed, that is, having the trip-block lying on the other side of the center of the slot.

The back traverse movement of the tur-' ret-slide. is arrested and its return or forward movement started by means of an automatic device for disconnecting the drive between the pulley-shaft 33 and the intermediate shaft 41, and a subsequent automatic reversal of the direction of rotation of the intermediate shaft. This automatic mechanism for arresting the backward travel is best shown in Figs. 2, 3, and 5, and comprises a rod 146- (Fig. 2) on the. back side of, and parallel with, the bed, carrying an adjustable collar 147 which, when F the turret traverses back at a high rate of speed, is struck by a lug 148 depending from the turret slide 3. The opposite end of rod 146 is connected to an arm 149 fast on a cross-shaft 150, this latter also having fast thereon an upstanding arm 151 (Fig. 5) which at its upper end engages a clutchfollower 152 on the pulley-shaft 33, which clutch-follower 152 normally maintains the gear 88 fast with the pulley-shaft through an expansion-ring clutch 153, the clutchfollower 152 being forced into the expansion ring clutch by a strong spring 154 encircling the pulley-shaft 33 between the clutch-follower 152 and the fixed gear 89. The engagement of the lug 148with the collar 147, through the described connections, retracts the clutch-follower 152 from the expansion clutch 153 and thereby arrests the drive of the intermediate shaft 41. Now, as the turret-slide 3 travels back, the turretrotating mechanism (not herein shown and described) causes the turret-head to turn to present a new face to the work; during such turning movement a pin 155 carried by the turret-head one for each face thereof) overrides the upper end of a depressible pin 156 slidably mounted in the turret-slide 3 (Fig. 2), the lower-end of said pin 156 overriding and depressing a horizontal bar 157 that is pivoted at its ends on the upper ends of a pair of arms 158; one of said arms 158 being fast on the shaft 118 (Figs. 2 and 13). Hence, when shaft 118 is thus rocked, the catch-block 116 is raised out of engagement with catch-block 115, the yoke 110 is thereby allowed to drop, the dog 109 is thereby thrown into engagement with the ratchet 10-7, and the drum 13 is indexed through one space. By means of a suitably placed cam-block on drum 13, the lever 91 i shifted so as to unclutch the gear 86, and clutch the oppositely rotating gear 87 to the intermediate shaft, thereby driving the latter in the opposite direction from the pulley-shaft 83 through gears 89, 90 and 87, thus starting the turret-slide on its forward traverse movement. As the lug 148 travels away from the collar 147, the spring 154 returns the clutch-follower 152 into operative engagement with the expanding ringclutch 153, thereby reestablishing the driven engagement of the gear 88 with the pulleyshaft 33. Asthe gear 86 on the intermediate shaft (with which the gear 88 meshes) has, however, by this time been freed from driving engagement with the intermediate shaft by the shifting of the clutch-follower 93 into engagement with the clutch of gear 87, the turret-slide continues to travel forward until its rapid traverse has been stopped and its feed movement started by the engagement of the block 141 with the block 138, as previously described. In this connec-, tion it may be stated. that the le er aetuated by a cam-block on drum 13 and connected to the clutch 94 is employed only when it is desired to intermit or throw out the use of the turret-slide, and use the cross slide alone. Since a given job may not require the full number of operations provided for by the spacing of the drums 12 and 13 (31 in the instance shown), I provide means whereby, after the last operation has been performed, the drums can be continuously indeized around to the zero or starting point.

Referring more particularly to Figs. 1, 13, and 14, 17 7 designates a short shaft journaled in a boss 178 on the frame 1 and carrying at its inner end a spiral gear 179 meshing with a spiral gear 180 of the same size fast on the drum-shaft 11. Keyed on the outer'end of shaft 177 is an index dial 181 having formed through its circumferential portion a series of holes 182 corresponding in number with the slots of the drums 12 and 13, and similarly numbered. By means of bolts 183, I secure to the periphery of the index dial 181 on its front face one or more blocks. 184, one for each unused space of the drums. To illustrate, in case a given job required twenty operations, I would apply to the periphery of the index dial 181 a continuous series of blocks 184 covering that portion of the periphery from the 21st hole around, through the space represented by the 11 remaining holes, to the hole corresponding with the zero or starting point of the drums. As the index dial 181 rotates in unison with the drum-shaft 11, making one complete rotation during one rotation of said drum-shaft (for which purpose it might be mounted directly on the latter), as soon as the last operation has been performed upon the piece of work in the lathe, the first one of the series of blocks 184 engages a roller 185 carried by the free end of an arm 186 that is fast on the shaft 118. As the arm 186 is raised by the blocks 184, the shaft 118 is rocked, disengaging the catch-block '116 from the catch-block 115, and thus allowing the drum-indexing mechanism to rotate continuously until the roller 185 passes off the last block 184, by which time the drums will have been brought around to the zero or starting point. A handle 186 on arm 186 enables the operator to manually set in operation the tripping mechanism when desired. In the front wall of the housing opposite the drums 12 and 13 are formed openings 208 and 209, respectively; and above said openings are secured overhanging hoods 210 and 211. To the outer side of hood 211 are secured index-plates 217, 218, 219, and 220 (Fig. 15). The index-plate 217 bears numbers indicating the fine turret feeds obtainable by shifting the lever 55, and the index-plate 219 bears similarly positioned numbers indicating the roughing tions for the correct position of the camblock in order to throw the turret-slide movement into or out of action; and the levers 55, 91, and 56 are provided with pointers 221 that project laterally beneath and above the lower edge of the hood 211 and overlie the several index-plates so as to readily show to which side the lower end of each lever must be shifted to obtain a certain feed or the forward or back traverse of the turret slide, and consequently the position which the cam-block must take on the drum in order to so shift the lever. Another pointer 221 attached to the lever 99 and overlying the index plate 220 indicates by its position whether the controlling clutch 94, 94, 95 of the turret lead screw is in idle or operative position. The shaft 137 of the turret-trippin mechanism is rovided with an arm 250, t rough which t e mechanism for tripping the turret traverse and feed may be-operated manually, if desired.

In the practical operation of the machine, and having reference simply to the operat'ions performed upon the work" by the turret tools, for the performance. of a given piece of work, the o erator at first determines the number of ifi'erent operations required thereon by the turret tools, and also what these several operations will Be. That is, he knows or ascertains in advance the number and kinds of roughing feeds and the number and kinds of fine orfinishing feeds and their proper order in succession that will be required of the turret tools, and the number and proper relation in the job of the rapid traverse movements of the turret-slide. He then secures cam-blocks on the successive spaces of the turret-drum 13 in positions to properly actuate the several levers, respectively, controlled by said cam-blocks. The.

operator also sets the trip- blocks 138 and 139 on the turret-operated table 135, in order to arrest and throw in the rapid traversetand feed movements of the turret at the proper times. In ractice, this priming of the ma-.

chine may greatly facilitated, especially for new or inexperienced operatives, by means of charts which show the proper feeds 'to be given according to the tools used and the operations to be performed, and the proper positions of the cam-blqcks in the several slots of the drum in order to obtain .the desired or required 'consecutivemovements, speeds and feeds of the cooperating parts. Such charts will also preferably show' the cutting speed in feet per minute according to the spindle speed and diameter of the work, and also a change gear chart showing the proper change gears to be used to securelany particular finishing and roughing turret feeds, and the feed per revolution and cuts per inch obtainable with anyglven set of change gears. If any given job does not require the full number of operations representedby the number of slots in the mtermittently movable drum, blocks 184 will be placed on the front of the dial-disk 181 corresponding totthe unused spaces on the drum, thus providing for a continuous indexing of the drum from the point at which the last operation was performed around to the zero or initial starting point of the drum.

I claim 1. In a machine of the character described, the combination with a machine bed and a turret mounted thereon, of means, including a plurality of clutches, for transmitting forward and back traverse and feed movements to said turret, means for selecting said traverse and feed movements, intermittently movable cam mechanism for actuating said selecting means, and means actuated by said turret during its forward travel for throW- ing into action said intermittently movable cam mechanism, substantially as described.

2. In a machine of the character described, the combination with a machine bed and a turret mounted thereon,.of means, including a plurality of clutches, for transmitting forward and back traverse and diiferent feed movements to said turret independently op erable devices for shifting said clutches, an

intermittently movable drum carrying cams adapted to actuate .said clutch-shifting devices, normal1y idle means for rotating said drum, and means actuated by said turret during its forward travel for tripping into action said drum-rotating ,rneans, substantially as described.

3. In a machine of the character described, the combination with a machine bed and a turret mounted thereon, of mechanism for transmitting traverse and feed movements to said turret, a controlling mechanism for said traverse and feed-actuating mechanism, normally idle means for actuating said con-, trolling mechanism, a depressible stop-table in the path of the turret-cooperating stop devices carried by said stop-table and turret, respectively, for depressing the former, and means actuated by said stop-table when depressedfor tripping into action said normally idle actuating means, substahtially as described.

4. In a ,machine of the character described, the combination with a machine bed and a turret mounted thereon, of mechamovements to said turret, a controlling mechanism for said traverse and feed actuating mechanism, normally idle means for actuating said controlling mechanism, a de- 'pressible stop-table in the path of the turret, cooperating stop devices carried by said carrying cams adapted to actuate said clutch-shifting devices, normally idle means for-rotating said drum, a depressible stoptable in the path of the turret, a plurality of stop devices adjustably mounted on said stop-table, a stop device carried by said turret adapted to successively engage the stop devices on said table and depress the latter, and means actuated by said stoptable when depressed for tripping into action said drum-rotating means, substantially as described.

6. In. a machine of the character described, the combination with a machine bed and a turret mounted thereon, of means for transmitting forward and back traverse movements to said turret, said means including a spring-actuated clutch through which the back traverse movement is effected and a cam-actuated clutch through which the forward traverse movement is effected, adjustable means actuated by the turret on its back traverse movement for throwing out of action said spring-actuated clutch and holding the latter out of action until the forward traverse movement has begun, and cam-actuated means for throwing into action said camactuated clutch. and simultaneously rendering idle" said spring-actuated clutch, substantially as described.

7. In a machine of the character described, the combination with a machine bed, a turret-slide mounted thereon, and a turret-head rotatably mounted on said slide, of clutch-controlled mechanisms for effecting forward and back traverse movements of said turretslide,,means actuated by the turret-slide during its-back traverse for disconnecting the back traverse mechanism, and means actuated by the turret-head during its turning movement for throwing into action the forward traverse mechanism, substantially as described.

8. In a machine of the character described, the combination with a machinebed, a turret-slide mounted thereon, and a turret-head rotatably mounted on said slide, of mechanisms for effecting forward and back traverse movements of said turretslide, means actuated by the turret-slide

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