US2371685A - Grinding machine - Google Patents

Description

arsh 20, 1945.

R. E. FLANDERS .IGRINDINGVMACHINE Filed Aug. 1'7, 1940 6 Sheets-Sheet l March 9 R. E. FLANDERS GRINDING MACHINE s Sheets-Sheet 2 Filed 'Aug. 17, 1940 mum fitlllll llllll "II I March 20, 1945. R. E. FLANDERS GRINDING MACHINE Filed Aug. 17, 1940 6 Sheets-Sheet 3 March 20, 1945.

R. E. FLANDERS GRINDING MACHINE Filed Aug. 17, 1940 6 Sheets-Sheet 4 March v R. E. FLANDERS GRINDING MACHINE Filed Aug. 17, 1940 6 Sheets-Sheet 5 My a? @Q Patented Mar. 20, 1945 GRINDING MACHINE Ralph E. Flanders, Springfield, Vt-., assignor to Jones & Lamson Machine Company, Springfield, Vt., a corporation of Vermont Application August 17, 1940, Serial No. 353,050

16 Claims.. (Cl. 51-95) This invention relates to grindingmachines and is shown as embodied in such amachine of the general type illustrated in my Patent No. 2,187,227 granted January 16, 1940, for Grinding machines.

One object of the present invention is to avoid the necessity for machining and fitting a long slide on whichthe head and tailstocks are fastened as shown in my patent hereinbefore mentioned. v

A further object is to reduce the load on the lead screw which results in more accurate lead control.

Both of these objects are obtained in accordance with this invention by securing the head and tailstocks to the bed and providing for mok the purpose of this adjustment the bed is protion of their spindles to produce the axial motion of the work.

Another object is to simplify the automatic control of traverse, wheel feed, and truing.

Further objects and advantages will appear from a description of an embodiment of the in-' vention disclosed in the. accompanying drawings in which Figure 1 is a front elevation of a grinding machine embodying the invention.

Figure 2 is a fragmentary top plan of the machine, parts of the head and tailstock casings bei ing broken away.

Figures 3 and 4 are outer end elevations of the head and tailstocks, respectively, Figure 4 showing the tailstock casing broken away and certain of the parts in section.

Figures 5 and 6 are sectional views on the correspondingly numbered section lines of Figures 3 and 4, respectively.

Figure 7 is a detail section on line L-l of Fig-Q ure 6.

Figure 8 is a detail section on'line 88 of Figure 3.

Figures 9 and 10 are detail sections on the correspondingly numbered section lines of Figure 6.

on line ll--ll of Referring to Figures 1 and 2, at l is indicated a' machine base provided with longitudinally ex tending inclined ways, one of which is shown at 2 in Figure 3, upon which are mounted a head'- stock 3 and a tailstock 4. Both the head and tailstocks are arranged to be clamped to-the bedand both are adjustable axially therealong. For

vided with a pair of rack bars 5 and 6 and the head and tailstocks are provided with pinions ,1 and 8,respectively, meshing with these rack bars and supported in casings 9 and Ill secured to the respective stocks. A squared shaft l I, which carries the respective pinions 1 and 8, extends outwardly for the reception of a wrench or handle by which it may be turned, thus to adjust the head and tailstocks axially as may be desired. When adjusted as desired they are clamped rigidly in position by any suitable means (not shown), this, however, being well-known in the art.

The headstock 3 carries therein a rotary and axiallymovable work holding spindle l5 which at its forward end carries a work holding face plate 16. This face plate, as shown best in Figure 5, has a rearwardly extending skirt I! which extends between the annular packing. rings 18 and i9. Theouter packing ring [8 is secured as by screws 20 to the end of the headstock, and the packing ring I9 is secured to the end of a' bushing 2i within which the spindle I5 is journaled .and which is clamped to the headstock through a shoulder 22 of the bushing and anut 23 threaded on its inner end and bearing against the inner face of the headstock.

The face plate l6 may be secured to "the end I of the spindle l5 as by screws 24 anda cone center 25 may be suitably mounted axially within the face plate l6 and the end of the shaft I5. A work driving pin 525 may be secured in the face plate for driving engagement with the usual 1 dog which'is clamped to the work.

At its rear end the spindle [5 has a reduced diameter portion 26 over which may be placed a sleeve 21 having its outer face threaded, this sleeve forming a lead screw. It is secured for rotati'o'n with the spindle l5 as by a key 28 and it may have tapered ends 29 and 30 for engagement with the matingly tapered collars 3i and 32 between which it may be clamped, as by a nut 33 threaded on the reduced diameter threaded portion of the spindle, the'collar 3| being backed up ing 42' of the head stock. This quill 4l-has a portion of enlarged internal diameter as at'43 for reception of a mating large diameter portion 44 of the lead nut. The ends of this enlarged diameter portion 43 and the corresponding portion 44 of the nut are matingly tapered and a sleeve 46 with a tapered inner face is retained within the quill 4| as by a sleeve 41 threaded into the inner end of the quill M. This sleeve 41 may be provided with external ribs 48 to receive a tool such as a spanner wrench by which it may be turned. With this construction, lead nuts 44 corresponding to the various lead screws 30 may be removably clamped in position within the quill While under normal operation the nut 40...

dicated as a whole at 9| and of any suitable description, this arrangement of sliding gear and cone pulleys permitting a selection from twentyseven speeds for the rotation of the shaft 90.

At the headstock end the shaft 90 is connected through a gear 92 to drive a long gear 93. As shown best in Figure 5, this long gear 93 may drive either or both sets of gears of a compound gear 94 keyfid to the intermediate portion of the spindle I5. This compound gear includes a gear portion 95 having a hub 96 and a gear portion 1 91" having a hub portion 98. These hub portions is held stationary so that the spindle I5 in its rotation moves axially, it is desirable to-provide for angular adjustment of the nut in order that Y the threads of the work may be properly lined may be secured together as by screws 99 and they form between them an annular recess for the reception of a ballbearing 99 which engages in a groove I in ayoke member IN. The comup with the grinding wheel. To this end the quill I I 4| is mounted for turning movement in the per tion 42, but it may be clamped after adjustment has beenmade.

In order to eifect such clamping action and also pound gear '94 is provided in order to increase the permissive travel axially of the shaft I while maintaining a geared connection between it and the lon'ggear 93, since as long as either of its gear portions is in engagement with the long to facilitate the turning of'the quill '4I 'for adjustment, the following means has been provided. I

The outer end of the spindle is enclosed within a housing 50 provided at its inner end with a hand wheel portion 5| by which it may be turned. This hand wheel portion 5! is fixed ,angularly to the quill 4| as by the radial key 52, the hand wheel thus facilitating the angular'adjustment of the quill whenthe quillis free'to 'be adjusted. In order that the quill may beclamped'there is provided on thehousing 50 a sleeve 54 and a' clamp ring 55. The ring 55 is provided with oppositely extending ears 56 and 51; Theear 56 is slotted as at 58 to receive a screw 59, the head 60" of which engages the outer end of the ear 5 6. The ear 5! is slotted and'within the slot is po siti'oned the eye of an eye bolt 65 threaded at 61 into the headstock. Thus the ring 55 is held against rotation by its engagement with the member's 59 and 65.

The ear 55 may be pressed against the outer end of the sleeve 54 or retracted threfromto clamp rock shaft 10 (Fig. 8) which passes through the.

ear 51' has an eccentric portion TI on whichithe 5 l. The ring 55 is provided with a pairof spaced pins 14 which engage in, recesses 15 in the; endof the sleeve 54, thus to provide diametrical" points to which pressure is applied'to the sleeve 54' as by the tilting motion of the ring 55 as itis moved between clamping'and released position. When the ring 55 is in clamped position, it will be evident that as the spindle I5 is rotated it 'i's moved axially through the rotation of the lead screw engaging the stationary nut 40..

Means for so rotating the spindlecomprises the motor (see Figure 1) mounted on the machine bed and connected to drive ashaft 8L This shaft 8| is shown as provided with a cone pulley 82" having three steps thereon which is connected as by the belt 83 to a corresponding step'of thecone pulley 84 mounted on a shaft 85. The shaft 85" is also provided with a secondcone pulley 85 shown also as having three steps, which is con nected as by the belt 87 to the corresponding step of a three step pulley 88 carried byashaft 89.; This shaft 89 is connected to drive a shaft 90 through'a three-speed sliding gBar'mechanism in I gear 93, it is in driven relation thereto.

When the spindle I5 has progressed axially in one direction to a given extent, the motor 80, is reversed to drive it in the other direction and for the reverse direction of traverse. Means for doing this will later be described.

Means are provided by which the axial motion of the spindle I5 produces like, axial motion of the tailstock spindle. A portion of this mecha-v nism comprises the yoke [0| hereinbefore mentioned, this yoke being secured to a bar I05 mounts ed for axial movement with the headstock 3 and to which the tailstock spindle may be clamped.

In order to protect the headstock from the entry stock end by a threaded connection into the heador release the lead nut. For this purpose the: 1

stock casin'g and extending into the tailstock casing as through a suitable packing land at I01. The rear end of thevbar I05-is formed as a rack bar and slidable on this bar- I05 at the rack portion is a casing I I0 (see Figures 1, 2 and 4) This casing has a rearward. extension III through which'is'passed a bolt, I l2 extending through a slot H3 ina cap II4 (see Figu res 2 and 6) which houses the rearend of a tailstock spindle H5 slidably but non-rotatably mounted in the. tail- 7 stock 4,

Meansare, providedfor clamping. the casing I I. 0] to. the rack, bar I05 so that as the rack bar is moved axially with the headstock spindle, the tailstock spindle is moved correspondingly in the same direction, To thisend the, casing I I0 is provided with a rock shaft I20 on which is iolur-.

naled a, pinion I2I whichmeshes with; the-teeth of the rack bar'I05. This rock shaft I20 has keyedthereto av ring I22 and between the ring- [22 and a friction cone I23 integral with or secured to the pinion I2I is a friction shoe I24 which may ing; H0.

be p ressed up against thefcone I23to an adjustable extent asbyf a nut I 2 5. threaded on, the. inner end of the rock shaft I20. Thus the pinion I2I .r c.tionally. held to. the rock. shaft. Thi rock shaft extendsthrough the forward face of thecasing [l0 Where it has secured thereto; an arm I26,.the outer end of which carries av springlatch pin.l2l which maybe engaged in va latch; pin socket [20in a face plate I29. carried by the.cas-, This latch may-be, released from .its. socket by pulling outwardlyon a handlesI30fultra n d at I31 ontherock shaftl20 and through which atshan :32 of thelatchpin; 12] rojects,

v. ,th' isish ankha'ving a. head I34 on. its forwardend.

of the block I4I.

By pulling outwardly on the handle I30 the latch pin may be retracted from its socket I28 and then by rocking this handle to the right as viewed in Figure 1*about the axis of the shaft I20, the shaft I20 may be turned, thus turning the pinion I2I and producing a corresponding retraction.

of the tailstock spindle. I This provides for retracting the tailstock spindle for the removal and insertion of work between the spindles. In the normal operative condition the handle is in the position shown inFigure 1 and is latched in this position, in which position also the head and tailstock spindles are connected to the rack bar I05 for. simultaneous and equal axial motion, thus carrying the work 35 and effecting the lengthwise traverse of it with relation to the grinding wheel 36.. I I

The tailstock spindle carries the cone center I40, which as shown in Figure 6, is carried by a tailstock center block I4I. In grinding. a tap it is desirable that the lands of the tap be relieved in order to provide clearance back of the cutting edges of the tap, and for this purpose a motion of the tap from and toward the grinding wheel in time with the rotation of the tap is provided. As shown'this relief is produced by amotion of the tailstock center. To this end the center block MI is rockably mounted in the forward end of a sleeve I42 slidable axially within the tailstock spindle I I5. This sleeve I42 is keyed to the spindle II5, for this purpose a screw plug I43 being provided which is threaded into a side wall of the spindle H5 and has-a reduced extremity I44 riding in a slot I45 in the sleeve I42. The shank I46 of the center block I4I extendsrearwardly in acollar I48I engaging a transverse pin I482 ex tending through the shank I46. ThisspringI480 holds the center block I4I' with its concave rear face into engagement with the forward end of the sleeve I42, while permitting rocking motion The tailstock center is arranged to be rocked about its bearing against the end of the sleeve I42 to-produce the relieving action.

'To prevent'the entrance of coolant and foreign matter into the tailstock, a conical flexible shield I50 is secured at its forward end to the center block MI and to'its rear end to a boss I5I of the tailstock.

The rear end of the shank l46 is split as at I55 and has a threaded opening I56 to receive a screw I51 (Figures 9and provided with a head I58 which screw extends through a slot I59 through the spindle II5 so that it may be accessible for actuation to clamp or release the screw I51. By adjustment of the screw I51 the tailstock center may be adjusted laterally for parallel or, tapered: work as may bedesired. In the case of taps it is i common practice to provide for taper with the end diameter larger so all the cutting is done by thefirstfew teeth. I I I I The head I58 is pressed by a spring I 64 against 5 I the face of the lever I10 pivoted between a pair of centers I1I fixed in a pair of oppositely'disposed ears I12 of a slide I13. This slide, as best shown in Figure 9, is mounted for vertical sliding movement in a guideway I14 in the rear wall ofthe tailstock 4 and it may be vertically adjusted by means of a screw I15 threaded thereinto and provided with a head I 16 positioned in a recess I11 in a block I18. This blockI18 is secured to the rear wall of the casing 4, as by means of a screw I19. The cover I80 of the tailstock casing is provided with an opening I8I in substantial alinement with the head I16 and through which this head is accessible to a screwdriver in order to adjust the slide I13 vertically. This adblock MI and the centerI40, but as the slide I13 is moved upwardly, the amplitude of this relieving motion of the center I is increased. ao The lower end'of the lever I10 is formed as a narrowed depending tail I85 (see Figures 6 and 9) to the lower end of whichis secured a U shaped guide I86 between the sides of which is positioned an eccentric I81 for bearing on opposed walls 85 thereof.

shoulder I93 of the sleeve I89.

-Keyed for longitudinal but non-rotative motion relative to the sleeve I89 isa shaft I94. This shaft I94 extendsinto a change gear casing I950 l, 2 and 4). I On the splined end of this shaft I94 is a gear I95, and clamped to a boss I96 through which the shaft I94 passes is a hanger I91 having a slotted arm I98 for the reception of a stub shaft I99. This stub shaft carries the change gears 200 and 20I, the gear 20I meshing with the gear I95 and the gear 200 meshing witha gear 1 202 on the splined rear end of the shaft 90. A hinged cover 203 provides access to this train of I94and 90 may be adjusted as desired. Thus for each revolution of the drive shaft 90 and consequently rotation of the work spindle, the correct number of oscillations of the dead center I40 may be produced depending upon the number of flutes in the tap being ground and thus produce a relief on'each of the lands between the flutes.

In order to properly relate the direction of relief for right and left hand taps; provision is made for indicating thecorrect angular position of the cam I81 when a cutting edge of the tap is in the plane of the work and wheel centers; Tothis end thesleeve I89.is provided with a pointer I890 which may be turned into registry I89I secured as by screws to the tailstock of the machine. This adjustment for right or left hand taps may be done only when the change gears 200 and 20I are out of mesh with one or both of f their mating gears, as it requires the turning of justment determines the effective amplitude of This eccentric I81 is secured to the forward extremity of a stub shaftIBB which is pinned to and within a. sleeve I89. This sleeve is journaled in bearings I and I9I and is held in axialposition by a nut I92 on one side of the 403 bearing I9I which holds this against an annular .1 at the tailstock end of the machine (see Figures gears so that the speed ratio between the shafts with the proper mark R or L,on a ring member the. shaft L94 to-which the sleeve I88. iskeyed relativev to. theshaft 90. Y

In setting up for a right handtap, forexample, the slide. I13 isadiilsted so. that the pivots: I11 are opposite to the center-of the screw I51, in. which position the top of the slide I13; is opposite the zero indication on thescale .205 (Figure- 6) adjusted, the. grinding will be concentric and with, or without. taper, depending on thevsettingr' of the screw 151. J'usted so. that the t p. is automaticallvxsized; to the proper diameter. Then the tapis adjusted angularly to, bring a cutting face to a predee.

termined angular position (which may be de termined by any suitable gaging means notv own) nd d ed in tha position. The-sleeve I89 is then adjusted to bring the pointer at [820; inline with. the. letter R and the chan e; gears The. machine can then be ad-t are then brought. into mesh. The slide lz'ldis then moved to position to give the desired. ec-wcentricityfor relief. The extent of eccentricityis. determined-by the setting of the slide 1113; while the start ofthe. oscillati nn oducine h eccentricity is determined by thesetting of thescrew,.l.51. Each succeeding tan i do ed when the same angular po ition. of a cutting edge.

Screw I51 being infixed position,- the starting point of therelievine o cillationma-y remainfixed r ardless of the mount of eccentricity; he

direction of motion of the slide. .1755. bein shill..-

cient-ly eccentric to: the axis of the shaft .ttfizso a j m n or re ief does. not change.- the.- size adjustment. The setting for left hand; tans.

is the same, exc pt hat the cut in ed es. of; the n are faced in the opposite direction nd: the sleeve 18.9 is a justed so. hat thepomter l-Bfinis.

brought into line with theletter L,

The tailstock center construction and-Icon;-

trol per se are not claimed herein, but iolmisnlor je t. m t of a; di is onal appl at on Serial No. 408,368, filed August 26, 1:9-l1, for. Tailstoclg.

The feed a d ne me han sm m y. he of the eh r ltype how n my Pate t No..1 ,,187;.227; ou h there are ertain chan es arran ements of the parts which will now be described.

rangement ,shownin Figure. 11 of my Patent No. 4375 .27. y

.This'h rtion 2115 of the wheel. carriage has journaled therein-the sleeve 22.5; the forward end of-which isformed asat 2;.2fi1as'a nut for threaded enga ement; with the: rear threaded portion 221 ofa feedzshaft. 22.8.: .Thisfeed shaft 228 corresnondstotheshait 645. shown inmy Patent No. 2,167,227 andhas.threaded-connection at its for ward vend with a nut member 230 which. carries frictiorrally: mounted; thereon a gear 23!; this mechanism being the. same-as thatshown in my Patent No. 2187.227. 'I'hisgear isdriyeninrelation to a gear 232 journaled ones-shaft 233 and hasaconnected. thereto. a hand wheel 23!;

mechanism is the sameas that shown in said Patent No. 2,187,227, with the exceptionthat in thepresent'machine. the shaft 233 is. located to the right of the gear 23'! instead of to the left thereof asinmy. patent, and the bar 235 which is secured to the shaft 228. to .hold it from rotation isguided by. an extension 236 of the shaft 23.3; rather than by a'separate member. At 240 ,is. shown a ,truing feed shaft similar to the tru-. ing feed shaft M189 ofmy patent and; which is connected to rotate the sleeve 225 through the gear train. comprising the gears 24!: on. the. shaft 241]; the idler gear 2.42,.and a gear 2.43 carried by. the shaft 244. The forwardend of this shaft 244. hasa splined connection with the sleeve 225. Intermediate its ends it also carriesa gear 251] meshing with a long. gear 251' journaled on a stub shaft 2 .52 of the wheelcarriage 2H1. This long. gear 25l also meshes with a gear.- 253 carried byxa shaft 2.5.4.. This shaft25it. is threaded through .a lug: 255. forming'ia portion of the slide This mechanism asshown herein is not herein a med p r se as itt rms. s b ect matter. ofa divisional application Serial No. 397,710.- filed June 12, 1941,- for i ing W el: and: timing mechanism feed. The grindingheel. 3 6. is. mollntedonacarria efland is driventhro gh a belt connection 2:131:-

d u t ble driving pulleys. fromahiotor :21 2; also moun ed. ont e. a riage 21B subs an ially shown in. my Patent No. 25181227,. carriage ei movabletransverse to he ax s ofz he head k .spindl It is rr nged to. e. fed; toward. the work by mechanism quit similar to that.

s n n ai pat nt, the d tails ofwhiehhow-x ever, as shown are somewhat ,di riage .210 is normally pulled ,1

Around this sprocket wheel I purpose a chain 2! (see Figure l3) issecured to l 2H): and; itis. journaled in a lug 256 secured to a trlling device; slide 251.. isturned to advance-the grinding wheel slide 210, it; also; turns. the shaft 254.- andadvances the whe l. truing slide 251. by the same amount, the ears 50 and:.Z53@ being. of the same size. This. ction, therefore, is the same. as that shown in mygPatent N o.,2,l;8,7,2. 7, eachv increment of feed "of the truing mechanismalso being accompanied yxan equal increment. of feed of the grinding wheel. J

Th m ans for rotating the feed mechanism both for the wheel feed. through; the rotation of: the. slee e 225 which is independent of the truihg device feed: anditherotation of the truing device feed which isassociatedyvith an equal whcclfeed is accomplished loy mechanism some.- what different from that shown in my Patent No.

1:81227 being controlled in the present mach n hrou h electrical me hani m which takes the 1 12. 6. of the lay. sh ft. and its operating meohae nism di c ed in my pri r pat nt.

This electrical mechanism-includes the two. electric. switches. 2,69 andv 26.! carried by the headstock. and actuated by dogs 2.62 and 26.3, respectively, carried byabar 262; secured to a bracket 265, which in turnv is secured to the bar I05, -'lhe-ba-r-:2fl;thus partakes' of the traverse mtion; of the headand tai-lstock spindles thus -zmov the dogs. 2.62am, Zita-into and out of co= operative relation with-the. switches :25 l and Y262, respectively; These switches 2.6Land: 262 are normally closedqsvsdtches and are opened by enaa mentwith their respectiye dogs, and as. will -1 1 annearthey control the direction. of. rotat on f the-motor 8D. and: also control. the. energizaf ioh of a feed solenoid-219;.- The core of this s lenoid is; adlils ably'cohnected. through a yoke 3 3 1. adiusting fichew flzr to a. link- 2:113 which Thus as the shaft 24.4.

. carries the ratchet wheel 211 (Figures 1 and 11) and also a rockablecollar 218 provided with an tween the'link portions 299, 29!.

grinding cycle at theftime of a work feed, as, for example, priorto or after finish grinding, or at arm 219 provided with a ratchet dog 289, which cooperates with the ratchet wheel 211. Similar ly the gear 232 for the wheel feed carries the ratchet wheel 282 and a rockable collar 283 provided with the arm extension 284 provided 1 with a ratchet dog 285 for cooperation with the ratchet wheel 282. r

The rockable collar 218 is connected through a '15 two-partlink 299, .29! to the lever 214 at 292.

The two parts 299 and 29! have a pin and slot lost, motion connection with each other at 293 and there is also'a connection through a coil spring 294 between the lower end of the portion 299 and the upper end of the portion 29! such that rocking of the lever 214will rockthe collar 218 when such motion is permitted, but this collar may be held against rocking, whereupon the spring 294 yields and permits lostmotion be-"2'5 The ratchet collar 283 is connected to the right hand end of the lever 214 through a pin and slot connection at 298, the lever 214 being also I connected at its end through a spring 299 to the30 same rocking collar 283. Rocking of this lever 214 acting through the spring 299 will also serve to rock the collar 283 and ratchet the gear232 around when such action is permitted, but if it is H prevented the motion is taken up in the lost motion 'of the pin and slot connection at 298, the spring 299 being stretched. A coil spring 399 connected at one end to the lever 214 and the other to a suitable fixed portion of themachine, frame tends to hold the right hand of the lever upwardly with the solenoid core of the solenoid 219 in depressed condition. At 392 is showna dash pot connected to the lever 214 through the link 393, this having for its purpose to prevent a too sudden motion of the lever, 214. At 304 15 shown a lubricant pump which is connected for I actuation by oscillation of'the lever 214.

The-truing feed actuated by rotation of the shaft 249 may be prevented, for this purposethe W collar 218 having an extension 3! 9' (see Figure 1) provided with a latch pin 3! whichmay engage ina notch 312 in a latch lever 3I3 fulcrumed at I 314 to the'machine frame and carrying at the opposite side of its fulcrum a dog 3 !5.* This prei vents actuation of the truing device feed:unti1" such time as the oscillation of "the lever 214 acting' through the ratchet wheel slide feed has turned the gear 23! sufficiently to cause a dog 329 adjustably secured in a concentric groove thereof to contact the dog 315 and rock thelever O 3l3 in a direction to release the latch pin 3! whereupon further oscillation of the lever 214 frees the ratchet collar .218 for rocking, thus to cause the oscillation of the lever 214 to actuate the truing device feed and with it, by an equal' increment, the wheel feed, quite independentlyof and in addition to the wheel feed produced be efiected at any point or points desired in the L both times, dependingupon the settings ofthe wheel dogs 329. The feed of the wheel slide through rotation of the gear 232 may be stopped at any desired point bya positive stop mechanism such as is disclosedin my Patent No. 2,187,227,

and a portion of which, including a spring 3!6 and related parts',"is shown in Figure 1. Likewise the grinding wheel slide may be moved independently of the ratchet feed mechanisms by the rocking of the lever325 corresponding toythe lever 949 shown in the same patent, and which may be controlled in the same manner as shown therein. 4 i i n It will be noted that in the patented structure the amount of feed, whether through the wheel slide or the truing device, is adjustable by changirig the effective lever arms of the actuating mechanism. In the present case the effective lever arms of the actuating mechanism remain fixed andthe adjustment of the stroke of the ratchet dogs is accomplished by other means. As shown in Figure 1, the adjustment for the length of feed of the ratchet dog 289 is effected by the l angular adjustment of a dog knock-off plate 339 having a pin and slot connection at 33 to afixed portion of the machine bed and having a shield 332 which may cover moreor less of the teeth of the ratchet wheel 211, thus to adjust the proportion of the stroke of the ratchet dog, 289 which is efiective infrotatin'g the ratchet wheel 211. Similarly the efiectivelength of stroke or the dog 285 is produced by the angular adjustment of t a similar Shield 335; This feed mechanism is not claimed herein, butforms subject matter of a copending application Serial Number-39'1,'110, now Patent No. 2,284,954, granted "June 2, 1942, for G As shown in this figurejthemotor 89 is of the three-phase type wired to rotate in opposite directions in accordance with the closure of the two control switches 349 andl34 I, the power being derived from the three-phase leads 342, 343, 344.

The switches 349 and 34! are normally open 9 switches, but they maybe closed by energization of their respective closing coils 348 and 341. a

At'348 and 349 is shown a pair of direct current control lines. The line 349 leads to one side of the starting switch 359, which when depressed completes a circuit through the normally closed jstop switch35l; switch coil 352, lead-353, the normally closedswitch 354, and overload switch 355 to the opposite lines 348. Energization of the switch coil 352 closes the normally 1 open three-pole switchf369; The closure of the contact at 36!," of this three-pole switch short circuits the starting switch 359 through the leads 362 and 363,;sothat the starting switch 359 may be allowed to open without de-energizing the coil 352, though opening of the stop switch 35! will do so; 1 Assuming that the work spindle is at the lefthand limit of its traverse so that the switch at 269 is closed, and the switch at 389 i fopen, the alternating current line 342 is conf nected through the leads 365 and 368, the switch 269, leads 391, 368,'the switchcoil 341, lead369,

contact -364-of the switch 369, lead 319, contact relay 312 is in the position shown in its armature.

rocked toward the electromagnet 438. This energizationof the coil 34.1closesthe-motorswitch 341 and energizes the workcarriage motor 80120 cause traverse of the work carriage .toward'the right. At the same time current passes between the lead 368, coil 31.5 of "the three-pole switch 3.16 andlead314 to the lines 344, thus-closing two -.of the poles and opening .theintermediatetl'iird pole of the three-mole switch 1316. As .the carriage moves to the right, the removal of the right hand dog fromlthe switch-380 *permitsthis switch 381 of switch .316 and contact 388 of switch 384,

lead .389, coil380of the three-pole switch 39'], .to the line 348, :thus closing the upper two contacts of the switch .391 "and opening the lower contact; The .closingof the contact :392 of this switch .38.! closes :a circuit .inom the direct .current control line 348 through the switch .355, leads 39.3 and .394, contact 392, lead 395 through thecoil --386 of a two pole timeldelay switch 391, through 1ead385 to line 343. Closing of contact .39 closes .a holding circuit for the coil 3 52 from the lead 396,-1ead 353 and lead 363.

The carriage movement finallyropens the switch 260, .de-energizing the three-pole switch .315,

, opening the two outside contacts and closing the central one. The opening of the contact at-381 breaks the circuit through the coil .390 of the three-pole switch 5391 allowing the two upper poles of this switch to open and the lower-one to .close. This opens .the contact .392 and .deenergizes the time delay switch zcoil 396, but this time delay witch 391 remains ..closed .for .a predetermined time so that .current continues to pass through its .contact .398.from the direct current line 349, through lead 399, contact-398,.lead

40.0, .coil 40! of the relay 402, lead .428, closed contact 425, lead 393,. switch355 to the direct .current line .348. Closingof the relay 4.02 energizes the wheel feed solenoid 210from the direct cur-- rent line 348, lead 4.04; coil 21.0, lead 405, relay 402, and lead 406 to line 340. The wheel feed Llever .214 thus makes .one stroke. The purpose of the time delay switch 391 is to give-the solenoid 21.0 and the motor 80 time to complete their operation. When. this time delay switch 381 .Lfinally opens, it tie-energizes thecoil 4M allow- 8'0 and making contact at 42.0. Closing .of the contact at 420 closes ,a circuit from the alternating current line 344 through leads 314 and .313, contact 4.23. lead 42]., contact 422 of theswitch 3fifl, lead 423..Coil .346 of the switch .340, lead 38l, .dog switch 3.80, leads 36.6 and .365, to the alternating current line 3.4.2. This starts the work motorist! rotating in .the reverse direction with carriage traverse to the left. When the traverse dogpermits closing of the contact 380, both of the three-pole switches 318 and 384 are .moved until the stop dog opens the switch 260 which permits'the switch 384 to move to two-contact open position. Opening the contact at 388 breaks the circuit with the coil .390 and allows the switch 33;! to move'to two-pole open position, but closes the contact at 425 .so that with the delay switch 33! holding on, the solenoid 210 is energized to provide a-single wheel feed action as before described. Opening of the switch 384 to two-pole open position closes the contact at 430, so that when the time delayswitch lets go and closes the contact 4), .a circuit is closed through from the alternating current line 342 through the lead 385, contact 410, leads 4 H and .4 I 3,.c1osed contact 432,, lead 433, contact 430, lead 434, right hand relay coil 38,.(:on.taci' 4.36, relay .312, leads 313 .and 314 to the alternating current line 344. This throws the relay .312 to the right into the position shown in Figure 14,-whereupon the cycle is repeated with the work carriage traversing toward the right.

From the foregoing description of an embodimerit of this invention, it should be evident to thoseskilled in the art that various .changes and modifications might .be made without departing from the spirit or scope of this invention as defined by the appended claims.

Iclaim: r

1. .In a .machine .of the class described, a bed,

a headstock and .a tailstock, means for clamping saidstocks .to said .bed, said head and tailstocks having spindles movable axially relative thereto, means eccentric to and connecting said spindles for. simultaneous motion in the same direction relatively to their stocks; and means for so moving said spindles. I I

. 2. .In a machineof the class described, a bed, 'a headstock and a tailstock, .meansfor clamping said stocks to said bed, said head and tailstocks having spindles movable axially relative thereto,

..means. eccentric to and connecting said spindles for simultaneous motion in the same direction relatively to their stocks, means for somoving said, pin les, and means for adjusting independent of the spacing of said stocks the spacing between said spindles.

I 3. .In amachine of the class described, a bed, a headstock and a tailstock, means for clamping saidstocksto said bed, said head and tailstocks having axially movable spindles, means eccentric to and connecting said spindles for simultaneous motion in'the same direction, means for so moving said spindles, and means for adjusting the connection of said connecting means to one of said spindles lengthwise of said connecting means to adjust the spacing of said spindles.

4. In a machine of the class .described, a bed, aheadstockand a tailstock, means for clamping said stocks to said bed, saidhead and tailstocks each having a spindle movable axially relative thereto. means for moving one of said spindles axiallyrelative to its stock, a member eccentric to and movable with :saidone spindle relative to its stock and extending in proximity to the other of said spindles, and means for releasably'locking said other spindle to said member.

.each having aspindle movable-axially relative to its respective stock, a lead screw carried by one of said spindles, means for rotating said. one causing the axial motion of said headstock spindle spindle, a fixed nut engaging said lead screw, 9.

member held from rotation with said one spindle but connected for axial motion therewith, and means for releasably securing the other of said spindles to' said member to be'moved axially relative to its stock by the motion of said member.

6. In a machine of the class described, a bed,

to produce corresponding axial motion of said tailstock spindle, centerscarried by said spindles,

spindles, means supporting'said spindles for axial motion and said headstock spindle for rotation, a lead "screw, operative connectionsfrom said lead screw to said headstock spindle for causing the rotation of said headstock spindle to produce axial motion thereof, connections between said spindles causing the axial motion of said headstock spindle to produce corresponding axial for axial motion therewith relative to its stock,

and means for releasably securing the other of said spindles to said member to be moved axially relative to its stock by the motion of said member. 7. In combination, a headstock, a rotary and axially movable work-holding and driving spindle carried by said headstock, a drive shaft substantially parallel to said spindle, a long gear on said shaft, a lead screw secured to said spindle, a normally fixed nut engaging said lead screw, a pair of spaced gears carried by said spindle in driven engagement with said long gear, a member positioned between said spaced gears movable with the axial motion of said spindle but nonrotatable therewith, a tailstock having an axially movablespindle in operative alinement with said headstock spindle, and operative connections from said member causing axial motion of said tailstock spindle with said headstock spindle.

8. In combination, a headstock, a rotary. and axially movable work-holding and driving spindle carried by said headstock, a drive shaft substan-,

tially parallel to said spindle, a long gear on said.

shaft, a lead screw secured to said spindle, an axially fixed nut engaging said lead screw, means for clamping said nut against rotation with said lead screw, means actuable to adjust said nut angularly when said clamping means is released, a pair of spaced gears carried by said spindle in driven engagement with said long gear, a member positioned between said spaced gears'movable with the axial motion of said spindle but non-rotatable therewith, a tailstock having an axially movable spindle in operative alinement with said headstock spindle, and operative connections from said member causing axial motion of said tailstock spindle with said headstock spindle. r i

9. In combination, alined head and tailstock spindles, means supporting said spindles for axial motion and'said headstock spindle for rotation, a lead screw, operative connections fromsaid lead screw to said headstock spindle for causing the rotation of said headstock spindle to produce motion of said tailstock spindle, centers carried by said spindles between which a tap to be ground may be placed, a grinding wheel positioned to grind the threads ofthe tap, means motion of said tailstock spindle, centers carried 1 by said spindles, means for oscillating one of said ing on such adjustment.

12. In combination, alined head and tailstock spindles, means supporting said spindles foraxial motion and said headstock spindle for rotation, a

lead screw, operative connections from said lead screw to said headstock spindle for causing the rotation of said headstock spindle to produce axial motion thereof, connections between said spindles causing the axial motion of said headstock spindle to produce corresponding axial for oscillating one of said centers in time with the rotation of said headstock spindle, and means for indicating the proper relation of such oscillation to relieve the lands on the tap depending on whether the tap is right or left hand and with reference to a definite angular position for a cutting edge of said tap.

13. In a machine of the class described, a bed, i

a headstock and a tailstock, means for clamping said stocks to said bed, said head and .tailstocks each having an axially movable spindle, a lead screw carried by one of said spindles, means for rotating said one spindle, a fixed nut engaging said lead screw, a member held from rotation with said one spindle but connected for axial motion therewith, means for releasably securing the other of said spindles to said member to be moved axially by the motion of said member, one of said spindles having a center, and means for adjusting said center laterally.

14. In a machine of the class described, a bed, a headstock and a tailstock, means for clamping said stocks to said bed, said head and tailstocks each having an axially movable spindle, a lead screw carried by one of said spindles, means for rotating said one spindle, a fixed nut engaging said lead screw, a member held from rotation with said one spindle but connected for axial motion therewith, means for releasably securing the other of said spindles to said member V to be moved axially by the motion of said member, one of said spindles having a center, and

said? stocks to: said; bed; said: head: and. tailstocks each having: an. axially" movable" spindle; a. lead screw: carried by one of said: spindles; means; for rotating said: onespindle; a. fixed: nut engaging said. head screw,. as member held from rotation with said one spindle but connected: for axial motion: therewith, means for 'releasably securing the other of said spindles to said member. to be moved axially by the motion. of. said member,

' one: of: said; spindles having: a v center, means; for

adjusting said? center; laterally; and meansfor oscillating saidcenter-laterallyirom its: laterally adjusted: position in time with the rotation of said one spindle.

"16;? In combination, work supporting: means, a reversible:- electric? motor: driven meansfor traversing said work: supporting: means, a: tool carrier. movable transverse to the linexof traverse, az solenoidi connected? to said." carrier and; constitutingx a; moton for producing; such transverse motion, a. pair off traverse: limit switches oper ated by traverse of said worksupport, and means controlledv by' saidswitches for controlling said motor: to produce traverses; in opposite directions of theiwork supportingmeans and to'actuate'said solenoid to feed" the tool relative to said work supporting means.

RALPH E. FLANDERS;

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