US1036543A - Grinding-machine. - Google Patents

Description

J. BATH.

GRINDING MACHINE.

APPLICATION FILED JULY 22,1907

1,036,545, Patented Aug.27, 1912.

'7 SHEETSSHEET 1.

Jfiveniar: ZULZRSSGs:

J. BATH.

GRINDING MACHINE.

APPLICATION FILED JULY 22,1907

Patented Aug. 27, 1912.

- 7 SHEETSSHEET 2.

J. BATH.

GRINDING MACHINE.

APPLICATION FILED JULY 22,1907.

Patented Aug. 27, 19124 7 SHEETS-SHEET 3 K E w K E (A m/in i? MQ $1 J. BATH.

GRINDING MACHINE.

APPLICATION FILED JULY 22,1907

9m 5. MH r? in Z W m HJAMQWI n mt m w w .R: 7 33 QQ\\ 52 @Q 3 R? &9w 9 3 MW v M 3 WC. s a 6 w 0O Y/ m k Q2 3Q a J. BATH.

GRINDING- MACHINE.

APPLICATION FILED JULY 22,1907.

1,036,543, Patented Aug. 27, 1912.

7 SHEETS-SHEET 5.

l2! Wj'iness e5 l' r'zveniogfi J. BATH GRINDING MACHINE.

APPLICATION FILED JULY 22,1s07.

Patented Aug. 27, 1912.

7 SHEETS-SHEET 6.

In v6n% 5r,

J. BATH. GRINDING MACHINE. urmouxou FILED JULY 22,1901.

Zilgz'jinesses:

(ZE CJ adapted to grind work of the same di 0 upon a slide 40 which is adapted to reel The latter are adjusted so as to fit the Without looscness, by bolts E25 p through care 26 which project from iii, per sides of the bearings where the are divided to permit this adjustment the middle of the chuck sleeit pulley 27 about which a drivin g, passed to rotate the chuck and wmrhn the sleeve adjacent its opposite ends arr 'lars or rings 29 which lie outside bearings and prevent the chuck irr ping out of either hearing. The in reason of their connnection with the above described, are enabic'l to l toward and from each other to adios position for work of different lenf to enable them to be brought up 2 faces of the collars 29 so that there no looseness and side play of the chuck: and Work. Each collar carries three or more set screws 30 which pass through slots in the sleeve and bear against the worl; pieces iii to hold the latter centrally in the chucle In order to center the work quickly and accurately, I provide the devices shown in. Fig. 6. These consist of conical lien/ ed studs 32 and 33, held in blocks 34!: and which are detachably mounted upon the bases-1 10f the head stocks. The block of such a height and the studs so loeatci them that the axes of the latter are at the exact height of the bearing axis, while they are positioned laterally by inverted V" shaped ribs 36 on the head steel: ba is tering grooves in the under sides oi blocks. ,W'hen the blocks are moved toward each other; the conical heads enter the op site ends of the tubular work piece and it into a central position where it is tained by screwing home the set scr i The blocks are then removed to peri" it sertion of the grinding tool, it i understood that the use of these studs saves much time which would eat Wise be wasted in turning the chuck with the pieces in it and adjusting the e from time to time until the worlt i The grinding tool is represented emery wheel 37. Where the n'mclii throughout it is held by a spindle supported at both ends on opposite the work. These supports consist of i 38 at the left-hand side of the machine, 39 at the right These heads are sul tially duplicates of each other and are separate and independent except when :1 'nected together by the feeding means here inafter described. Each head in me cate transversely of the spindle on a 41. Each guide is formed upon a in 42 having a base 43 secured by a bolt and nut to either of the or 47. The slide 'tfi supports the b i i-bile that (les V i heads 39 at the the siides are mounted upon runs parallel to the spindle "Mailed o the W i oi the heads is held a bearing to contain the tool spindles Whereon .nding wheel is Will. will he noted that the grindingwhccl die shown in Fig. is formed three parts the live spindle 51.), a sla- T bar or shait iii, and an inlerrnm'liatc ill so not to rotat and projects .icadi; I38 tomird the heads 3?), size in p through the work. sponllc estates in its bearings and rests thin-elroni toward the heads 38. In in! t has a tapereil socket 553 into which Tim r-ed righthand end of the tool arbor H5 turn therewith. The adjacent end oft the bar 5i. is centrally bored to provide a bearor the leii';l:a1nl end of the arbor which cvliinlrical except at the extreme end where its tapers. Preferably the bearing is 'tinnnnl in. a scwratc piece M which is screwe nto a ta iped recess in the body of l 1 bar l, The arbor has near its tapered a soonhtlcr 55 against which the grindf wheel held by means of a sleeve 56 out Between the shoulder 55 and spindle lid is a nut which serves .i the arbor out of the tapered. hole.

' ll be Ollif'jtlt dtrl tha t the grinding as nearl as possible midway be and 39 so that there may be given thereto, while the rotary limited in size by the necessity of u; 121;; away the frictional heat generby its rapid rotation. It is obvious the latter is stillcncd by having its tcr end supported in a stationary hearing, A ;c the bar 171' "ng shorter and of greater ncior than c spindle, is necessarily in s of this bar also inits length diminforce applied to l es in propor- (i'ionary bar is clamped in driven so as to lit trictioinilly and to e uztnrla and the amount of feed neccsand arbor together may be con beams so orted at one and b ihe i I l and at fine other by the applle ll at gsinomg wheel 7 pressure against the work being p'zes'so'd ags-n-nsii 11:.

suppor sed by gr d: su pporfis 353 die, being {llvlaea between the-m v" I"; proportion by l-llQ 51 is its point of support of the zu'iwo'r from the grinder thfm when it is fitter. Consoqi ently Within certain tho ssiffness of the. ()OIHPOUIKl s creasss as the stationary membo Cilll'lihislies in length. However, ills tendons oi" the arbor lo-bend is insreased as it i ii.- ened, and as this point of suppqft grow, 2;} remote from the grinder. Qonssqnonl ho 5 increase of sfifiness in the bar 51 di loving the point of si'ip gort sway grinder, is partially compoiisstod by div minution of stifi ness in the arbor said therefore there is a point who theseidoncie balance and whore the in:

obtained. The proportions whsi-el the maximum stifi'ness is secured are illuslii'aiod above 0.6-. in Fig. 3; in which the stalionary bm adjusfod 1 short enough and its bearing with the arbor -1 95 is remote o'nongl'i from the Wheel in 2; r relatively large sl'iiiness, while 21w zu-lmr is lot given so gl'wit a la'eiigili to he Wsal*- 021ml. The extended be ring of iiio who Oi i i 1 ,1, 3 3: ins si 1011;; v moinoci also suds m i i mulliis s mess, as does ilie sleeve xvi'zicli cl 1 on lie outside by tho n 't i 011 its face ext flange which oxiends om? 4%"? and prevents Water and twoon the bsziiing surf The lix'o spi bearing sleeve ll: it will be noieil that each all the i and 51 in a long; Leaving in 4). The lo 11 of mach box is vr stifieziod by a idly bolted to lively 51' 3 wliiio iii olxzil length (ll s coniz'imod- .121 the hm (o .rings is vow 1 2 so large PZ'OPUEUUH of the WliOiQ membeiu bsing as much as, or more limit, half. lili s. enables the spindles to be held Without looseso that the free em: of the rotating one will turn amzuratoiy snout its own 55 and not about a point oniside oi the z iown hubs 66 Each bearing b0 is a conical sleeve, which is in the C contained in a tapered room; in H.1 3 head hubs enable a and. is held secuioly bhoroin by nuls GO and in place Wiiilo o= i 61, which are threaded 11 p011 l'llE- ends of the another substitui iii}; boxes and bear against opposite, sides of flu: poi-i .L

heads. Each box "*nti'slly bored and is outer box may cut 01' split on one ins oniei? pefrom the riphery to the bore can be com- (1? so be ovalpressed about the screwing up jsno K, 5 on the nut 60, and thus ioosenoss may he loose;

and 6L "so be retained moved and ution being which the slides 46 and 47 are shown as extending toward each other approximately far as the members 50 and 51 respectively. Thus the pressure of the work againstthe grinding tool produces no more leverage on the slides through the spindles than would .be the case if the tool were directly fastened to the slides. Consequently there is no opportunity of multiplying at the tool any looscness which may exist between the slides and the guide 48.

The left-hand slide -16 which carries the stationary spindle member is provided with a rack 68 with which meshes a pinion (39, held in a bearing beside the guideway d8 and connected with a hand wheel 70 by which it may be turned. by this means the member 51. may be moved away from the arbor 52 to permit placing of the work, and may then be carried through the work until the arbor is seated in its hearing. The movable slide is arrested when carried forward into correct position by an adjustable stopscrew 71 set into a lug 72 on a plate 73 which is fast to the outer end of slide 46 and overhangs the end of the guide. This is so adjusted that the slide will be stopped as soon as thetapered end of the arbor reaches the tapered portion of the bearing in block 5 L. After the machine has been running the arbor is inclined to become heated and to expand. In some constructions, to take care of this expansion, I make the bearing block 54 capable of yielding, shown in Fig. Here the block is contained in a recess in the end of the bar 51. in which it capable of sliding endwise, being pressed outwa d toward the end thereof by a spring 7a; which reacts against an adjustable abutment 75, The bearing piece is prcyenl'od from be ing expelled from the bar by a cap 7&3 threaded outside the latter and having a central orifice to receive the arbor. In both Fig. 3 and Fig. 15 the space in the bar 51 in rear of the bearing block filled with fibrous absorbent pacuiing 77 which is saturated with oil to lubricate the l'lcaring. The supply of oil is replenished by a hole in the side oi? the bar, which is closedby a screw To.

An important feature of this invention which conduces to the accurate results desired the construction of the guideway l8. This is made upon two arms 79 and 80 which extend from opposite sides of a curved head or goose-neck 8i fixed to the pedestal 1. These arms are made tubular for stiffness, and the lett-hand one which carries the endwise movable slide is braced formed with the ordinary flat bearing face 84, and with undercut sides and 86, but the novel feature consists in the fact that the broad face as is inclined downward toward the bed at an angle of approximately fortyfive degrees. The upper edge 87 joining the face 84 and undercut side 85, is horizontal and parallel with the bed, and forms the actual guide for the slides. The latter are shaped so as to embrace the undercut sides, and each contains between one of its lips and the lower surface 86 an adj'l table gib 88 which can be clamped against the guide in the usual manner to hold the slide stationary.- The weight of the heads causes the slide to bear against the faces 8% and simultaneously, and takes up any looseness which there might be between the lips of the slide and the undercut sides of the guideway. Thus the adji'lslment of the slit always takes place accurately upon a straight line which is that of the edge 87, and therefore the spindles are always held in exact alinement, whether the slides are clamped to the guides or are loose. Thus there no possibility of the spindle axes getting out of line, even by carelessness and laclt ol at tention on the part of the operator.

Instead of having a nglc tool act throughout the whole extent of the work piece, it is possible to grind the latter siuuzltaucously at dillercnt points on two dill'orent diameters, as shown in Fig. 7. For this purpose the stationary rigid bar 51 rc novcd and a live spindle 89 substituted therefor which is held relatively in a substitute set ol boxes. These substitute boxes bear the same relation to the spindle 89 as the right-hand boxes to the spindle 50 for the purpose hercinlmlore described. Upon the spindle S9 is clamped a split pulley 90 which constructed. in all parts the szuiic as the pulley (i l. It is driven by a bolt 91 passing over a long drum 99. (li i s. l and 2) that is fixed to a countershat, J? turning in bearings in a frame 9a which is pivoted to the column 81, and is :uljustcd so as to produce the proper tension of the belt by a bar 95 passing through the :lraruc on which are screwed nuts 96. The drum has a length as great as the reciproeating motion given to the slide 10 and heads 38 so that the belt may continue to run upon it when the slide is retracted for insert-ion and removal ol work. The counter-shaft 93 driven at the desired speed by a cone pulloy J? to which a belt transmits motion from a convenient source of power. The righthand end of spindle 89 which projects so.

that it may enter the work, is surrounded. by a bearing sleeve US'so as to be held rigid.

'This sleeve the same in construction as the sleeve 59 shown in Fig. 3, except that it may be threaded upon the end of one of the boxes, as well as being secured by bolts 99 to the head, while the bearing sleeve 59 has a cylindrical flange 100 which is slipped outside'of the left-hand nut 60 and secured to the head 39 only by the bolts 101. ()n the end of spindle 891 is a grinding wheel vthe pawl carrier 113.

102 which is mounted directly upon the spindle and is held against a shoulder thereon by a nut 105-3. This same arrange provided for holding the Wheel instead of the other shown in Each of the grinding tools is femzitically after each cut, and this fee be the some in amount for each of th 01' it may be more tepid for one th; the other, according as conditions re-n1 The feed is produced by feed screw of which there is one carried between members of e; oath of heads and i'otatab mounted in e ring 105 in a plate box 106 which extends across the front the heads of each peinend connected them. The screw. engages with a not 10? formed upon yoke 108 which extends across and is fastened to the rigid adjacent guideweys $1. This yoke has two foot; pieces 109, each of which passes through a. slot in one of the slides 10 zind is screwed to t-l guidewsy 11. The length of the slots through which he feet pass is enough greater than the feet to permit suliicient movement of the slides to gii'e the necessary feeding movement to the tools. Flanges 110 surround the feet 109 end overlie the slots so that nothing can tallinto them and obstruct the movement of the slides heads.

On the fol'wzufd end of each screw is fixed a ratchet Wheel 111 while odiacent thereto is'loca-ted pawl 112 esri'ied by an 211111 113 pivotelly secured at 311 in tl. teo l box 106 (see Fig. 10). A spring 11 normolly holds the men and pawl elevated, While 21 spring-pressed pin 11.5 holds the toe of the pawl against the toothed periple ery of the ratchet Wheel. .11 her 116 a? ranged in the box below the i'sl'ch Wheel so as to re *ioiocote entl'wise in s d tion parallel to the bed, and its ends trude from the opposite sides of the suliiciently to be engaged by feed do and 118 carried by the upper bed or platen 8. Each dog carries an adjustable 11?)- Which are aduptedto engage opposite ends of the bar 116 alternately as the bed. recip rocates, this engagement coming only new the end of the bed s travel and after tool or tools have finished a cut. dovementof the bar causes a li-shaped cam protuberance 120 to be moved first to one side and then the other of a leg 191 attached to As one of the 11,1 chided-sides off the protnbemnce is always 111 contact 'Wtt-ltthel or enxaht-rfz'ictien belt action of spring 11%, its travel causes the eri'n113 and therewith the pawl to be low ered and raised, turning the ratchet whe l and feed screw one step. In order to regulate the distance through which the 1 et screw. is. turned, .1 provide; pointed. so?

through the X and boats at one upon beveled pori stooo om. Figs. 9 and 10, a or zidwnceineotoi the set screw e i ll c e the arm to he eo .i-especti eand thereby the distance through y be moved by the can; projecsini' ur set sci'ew 12-6 (Figs. 1 11s a pointed end similarly engrigin the cowl 112 to regulate the the rat het Wheel, of time during ctwith a tooth my adjusting these screws, the my he fed only one tooth at each tion, or as many teeth as desired up to a" root a distance as the grinding wheel and ori; will stand.

The description above given applies en idly to the left-hand feeding mechanism to the right. For operating the former six" 01" dogs ind s provided. It will he ing mechanism i cit-her iced i 4 l 1- v we independent y of the other 1 1121 a he given a closer fit desired.

and so make the ste as possible I 01 holes in the nuts leed screw 1 :24. x13 1 ,I mi 1911.1 tor einlwise ploy. hich the slides 10 zilovement of the tools takes same plane as that in which the Wearingeway of 01 the work does notnt actwith relation to 001 were either above or (lit-uplane. If the the center of the Work and moved Lorizontall the point of contact atwhich tl cuttin takes lace would not he in the a he eizes Tf'l would shift to a, still stance this plane as the Work P031316 Worn and cut away. lhis 01' the point of contact causes the Work to be lliitCCdlittG, melting the finished bore ofthew 1: oval O1 elliptical, instead truly ciIci ls -J. having the tool fed diiectly toward the point at which the cutting takes place, Wear remains always n the Jieed so there is no oppo" tl'llllllJY for shifting oi"? and impairing ins This is another ion. capacity of l llkl inacl work.

faced oli' lint on time 1 faces of the bowls.

same. VQltlCtli plnno WllllB adjusted 'Y'Sl plates 132 bolted. to

the heads, and if tl.

forming occur- Wlieol bocom U of nbmdozi ins the "Wheel. The evenly all over i;

i we iinc bearings into the sonic flanges 4100 of the slides are so located that wlion ln'ongh 7 same plane, the axes of the bcarin alined. The heads are flllilll ,screws 1320 passing tin-owl flanges 4:00 and entering hippos,

One of the gzrcnlcnt noi'li glazed by in TV PA I; lions WillOll MO glazed. s 1

Without culling or heir climnetrioally op work and become worn the tool to not une'nenlyl, c I parts of 'tlic sv'orl-z mom 'lmn ing sprnn stilt-mg in A part oi? my in ing a trning' tool which clams :1 the grinder after each ists of a dininoncl. c i it shank which s adguslnl held t ming tool is :iiijns gcnoe ofs'th grinder shank 134i is pro having tooth wlnc "gogcmeno Willi a ecl upon the nearer" the Wheel to loo space of or the ocaringsm film sharp corners and e posits on l'ilU wh n om or loss i) l ll movement of {no o ring,

olio n" i lll'f'l'l 154 or 7155 1 an: constantly rotated in opposite dlmctmw holder 135, and. thereby ad- (liainond point toward the surio grinder. The amount of the l j nslcd so as only to take off enough l in lceop the grinder truly cylln- (l cloxm on its surface. This truing UL n'nls part of the machine, and is operilmlng the required working moves tlwrocf without necessitating any adu ot or rc--urrm1ge1nent of the tool relano the work, but acting while the same in llioir proper relative positions for rinilin \Vhero two grinders are em- Will tho truiug tools and holders therefor h lnplicntotl, as shown in Fig. 7.

As before tated, the Work'holding bed is Ll to rcclprmate on guides 5 and 6. Eli latter are specially constructed for strength where they project beyond the sides of the pedestal 1., as shown in Fig. 9. The it. of each of the arms on which the fol-lined is cored out so as to protllCt'Ll ribs 139 and 140 which are conmil together by a transverse horizontal ill. 7 This nmximum st-ifiness is sowitho'olsiilpcrfluity of metal, and a V. stu'lotnro is obtained than if the arms i of mlid metal, because there is=no gresit w'oight in the nuns themselves tending to 3 (lolloction.

mvsr bed or table has secured to it a one s lo of which is a groove l by a tongue 144: (see lit the table being lifted A pinion M5 1 1 ll'w rack and gives the mourn the bed which slmlit 1-46., which in turn is vy a; cone pulley 14.7, and carries :1 R washing with a Worm Wheel 149 isvel-so shaft 150. The latter has a bowl gear Ilfil engaging on a of its pm'i'pher'y t-wo comple- 4 and 1'BSp|3-?@l"l:l.y,Whl(ll n: L These bevel goat's are'rigidly to clinch inmni: 1.51: and by being ilrlvcn upon and grail with Hm llljll f-l 156 of tho {M10156 hllbS turn loosely about a a or Mal r shaft 157 00 which the hub 10m 145 is secured by a pin 168. This also passes througha rod lfiflflhickis l lo cndwise Within the tubular shaft A. slot 160 in th'md pcrmitsthdendovernent but prevants any relative between it and the tubular shaft.

i. H3011 Z, 2 endwise movement enables a, clutch in miller 161 which 1s pinned to the rod and is clutch teeth on its opposite faces to be l'n' ll ilgili into engagement either with the As these latter clutches 1 will be seen that connection of the shit! aoie clutch 161 wi h adjustable dogs 16 her and work. i1

L the movement of car ies on its Iorward edge the pinion to the other, recii ,1

The clutch the bed 7 whi n sides 0 a lever 10-: projecting upwardly close to the bed, and on the arm 16; is roll 1G5 l'mgitudinallyorcciprocable bar 166 pivota ly connected at 167 to a bell-crank lever 168 that carries a roll 169 between adjust-able stops 110 and. 171 on the threaded end oi rod 159. From 1d the action of the bar 166 in shifting the clutch will be ob nous.

it is possib also to shift the clutch hand. For this purpose a bar 172 havi quick threat secured to the lever 1 and projects forward through the frame of the machine. A stop in the form of a slideor nut 1'73 is included upon the thread of the bar 172, being-provided with a handle 17% by which it may he turned, and having a flange. 175 with a to be forced a frame. l against the 168 is meld 1G1 disengaged nu both the members and 155. @n releasing the nut and :sw ing the bar 1Y2 tr .vard the r t or left, the. d may in plane surface adapted coast the hat front face of the i this flange is screwed up vQraine. as in Fig. 14, the lever j '1 m lllltr-pfiahldll mti i re due;

cc eith r This nut serves a CORY rent and re means for stopping the movement of work instantly. iher types ot stop I may obviously be employed instead of the 'lhe fees dogs are pivoted to holders and 177 adjustably secured to the table )y headed bolts entering a groove 13's in the ecge of the latter. By swinging the pward about their pivots they may to tra'v past the arm 16 1 without ting the s1; is and reversing the feed.

rirriage 2 r held, u'iounted similarly to the cross-tie carriage in my p .icr patent above referred yatent referred to "J--shapcd cam project-ion 180 to, and is ted tra sversely of the bed and grinder by means ot a screw 175) which arranged and acts similarly tdthat in the The screw is turned step by step after each cut of the grinder so as to -teed the work up to the latter, by a carrie 1.. th e snittable bar 166 11). The incl inec sides. of this cam projection act upon the end of a plunger 181 which passes dowmva d through a sleeve 182 formed upon the stationary frame, and is held up against the cam projection by a spring 183. The plunger acts upon a pawl-carrying arm 18% so as to lower and raise e. pawl 155 which bears against the periphery of a ratchet wheel 180 on a sleeve carrying a pinion 188 that meshes with a gear wheel 189 fined and i6 3 on oppysito 11) enteringa groove in a,

to the shank of the feed screw 179; The parts are so ar anged that a downward movement oi the plunger causes the pawl to move the ratchet 186 through a. space of one or more teeth, according to the adjustment of the feed mehanism, while the pawl is raised after each downward movement by a spring 190 engaged with the arm 184 and with a bracket 191 to which the latter is pivoted. One adjustment for the feed is provided by the setscrew 192 threaded-into an arm of the bracket 191 which arrest: the upward movement of the pawl and so limits its movement in that direction while another set screw or screw step 198 on the end of the arm 18% bears againstthe plunger 181 and by adjustment limits the distance by which the latter moves the pawl downward. A. third screw 194; having a pointed end engages the ed e of the pawl nearest the ratchet, and so regulates the proportion of its travel in which it remains incontact with the ratchet. A spring 195 holds the pawl against this screw and against the ratchet. The smallest adjustment possible is one teeth of ti e ratchet, and the pitch of the feed screw and value of the gear train may be made such that each tooth will teed the work a distance 01" one ten-thousandth of an inch. The feeding devices previously described for moving the grindmay also be designed for a like fineness of adjustment, but a still. finer feed may be designed if desired.

it convenient construction for automatically stopping the cross teed when the work has been finished approximately to the requi-rcd size has been provided in the shield 196 which projects over the ratchet and is fastened to a disk 197 mounted loosely upon the sleeve 18? beside the ratchet 186. clamp nut 198 threaded upon the sleeve serves to bind the disk in adjusted'position and may itself be held by a set-screw 199. ver the grinding operation has been ted, and a measurement taken, the shield may be set at a distance from the toe of the pawl 185 corresponding to the exact number of ten-thousandths of an inchoi stock still to be removed. This distance is determined by scale of .graduatiens 200 marked on the ratchet. it will be understood after the disk has been clamped to the ratchet, it turns ,therewith, and when the loweredge of the shield comes adjacent the lower limit of the phwls movement, the latter will simply slide upon the shield, and will cease to feed the Work further.

It will be seen that the feeding mechanism last described, and the two feeding devices for the tool or tools, provide sop-a:- rately-operable means for feeding either the work or the grinder relatively to, the other, each of which may he fused'alone, .orvall-of which may he used in combination. There a. single tool is mounted as shown in Fi 3, it is sometimes convenient to hold the some in one position whilethei work is tied toward it, while when two tools are used, the work may be held stationary and each tool separately fed Or, on the other hand,

, the tool feed and work teed may be used in combination and in opposite directions so that the grinder may be fed as fast as its surface is removed by the truing tool so as to keep the acting point in the same position wlnle the work feed produces the necessary alteration of position of: the latter. Again by causing the tool to be fed in the some cirect-ion as the work, but at a slower rate, the ditt'erence between the two feeds may be made to produce a finer feed than can be obtained by either that of the work or tool "alone, and thereby Work of great accuracy may be broughtforth.

looling water is conducted to the work by a pipe 201, and discharged from a nor-: 202 into the bore of: the work. 1g

Flown thence the water falls upon the beds and is collected in a trough on the Jill. side of the latter, whence overflowing it falls into a trougl'l. 204: and into wide shallow pans 205 and 206 on the rear of the car riage t. The overllmv water from these pans is collected and immped again through the supply pipe by constructions and means similar to those described. in my prior Pat out No. 790,099 above referred to.

I claim l. A grinder for internal work comprising a work-support adapted to hold a hollow piece, :1- holderfor a grinding wheel passing through the worlr piece and stationary rigid hearings for said holder, said bearings being of a diameter less than the wheel, projecting toward one another and adapted to enter the work.

A grinder for internal work comprising a worleslrpport adapted to hold a hollow piece, and a holder for a grinding wheel passing entirely throngl'l the work and supported at each end at a greater distance irom the grinding wheel than the length oil the work, said holder including a rotary spindle and a rigid, laterally extending bar adapted 0 pass into the work and havin boa for the spindle.

grinding? machine comprising" a bed,

a worlr suppmt adapted to hold \"v'UIUli mounted on. said bed as to be movable thereon, a guide pinallei wit-l: said bed, a slide movably held on said guide, a bracket secured to said slide and overhanging the bed laterally. a secondo; whet also oven hanging the bed, and a grinder spindle hold by said lnracltets. said slide permitting movement of the braclns-t supported thereby when t. A. grinding machine coin,

a work support adapted to hold work mounted on said bed so as to be movable thereon, brackets mounted beside said bed and arranged to project laterally over the same in substantial alinement with the work, and a grinder spindle supported at its ends by said brackets and extending perpendicularly to the direction of overhang of the latter.

5. In a grinding machine for internal work, a bed, bearings separately secured upon. said bed, a work-h0lding sleeve having a central passage extending throughout its entire lengtlil, means carried by said sleeve for clamping tubrilarwork pieces centrally therein, and centering devices detachably mounted upon the foot or base portions of said bearings and movable axially thereof, said centering devices having cones located coaxially with said sleeve adapted to enter the ends of the Work and locate the same rentrally with respect to the sleeve and said clamping means.

(3. In a grinding machine, separated supports, and. a three-part holder for the grinder extending between said supports, said holder consistingof a spindle rotatably mounted in one of said snpliiorts, a bar clamped in the other support so as to project therefrom toward said spindle, and an arbor attached to said spindle and having a bearing in the end of said bar.

7. In a grinding machine, separated supports, a three part holder for the grinder extending between said supports and held thereby, and a grinding wheel carried and rotated by said holder at a point substantially midway between said supports.

8. In a grinding machine, a grinding wheel spindle consisting of a stationary member free at one end, a rigid holder there for, a rotary member abutting against said stationary member and held against deflection thereby, a support in which the latter member is rotatably mounted, and a grinding wheel carried by said rotary member.

9. In a grinding machine, a grinding wheel spindle consisting of a stationary member free at one end, a rigid holder therefor, a rotary member having a hearing within the end of said stationary member, whereby it is held from. deflection, a support "for the latter member, wherein the same is rotatably mounted, and a grinder carried by said rotary member, said grinder having a greater amount of lateral projection from the axis of rotation than either member of the spindle.

10. In a grinding machine for internal work, a spindle consisting of rotary and non-rotary members in line adapted to pass through the work, a projection from the end. oil one oi? said members having a bean ing in the adjacent end of the other mem- Lin: 2

prov ions for secu -LS point i Mind '1. rind 5 b 1 bar,

manner, 2111a mezz through G \VOI' end of one of said 111 of said supra by the othei" as to rotate therewith a 13. lntel nal work, :1

mad

i .le, a nut thr 1 the m gnnm n ports, a spindle rot", 0:1: gala it 021 9 other of said I .L 2111a bar 61 nding toward the for the {xi-b0]: him 01 to 1'0 securi m itachment 10 L rte clamp as, 'ad s1 means 10:.- vehcity an the spindle is rominde -'15 L0 secure lace the arbor mchi a 0'1; .6. lrelatlvel ted suppors, 1 by t ach 215mg provisions the 55pm:

21nd of ad tlm'v f. and bcmri; at its n'lhm' 0" he ha lnding Rum-hin suppo' "h u -r gummy closely an zu'bur suturing a finely in the an m 1."). sp m mlina;

- 1 ms! and on which said support is slidably moun ted, sald gulde being at an angle to the horizontal and having one edge, which extends in the direction of travel of the support, raised above the rest of the guide, whereby said tool support is automatically clamped in any position on the guide by gravity.

23. In a grinding mac line, a guide hav' ing a flat face at an angle with respect to the horizontal, whereby one of the edges of said guide, which is horizontal and e.\' tends in the direction of travel. of the tool holder, is located at a higher elevation than any other part of said face, and a tool holder slidingly mounted on said guide, bearing on the flat face thereof and clamped by gravity against the raised edge.

24.. In a grinding machine, a guide having a flat face and undercut sides, arranged at an angle with respect to the horizontal, whereby one of the edges of the guide is raised above the other parts thereof, and a tool holder mounted to slide on said guide and having portions embracing the undercut sides thereof, said tool holder being caused by gravity to be anton'iatically clamped against the raised side of the guide and to' guided with absolute exactness by the edge thereof, which edge extends in the direction of travel of the tool holder.

In a grinding machine, a bed for sup-- porting the 'work, a guide having an inclined flat face and undercut sides, and a tool supporting bracket overhanging the bed and supported by theguide so as to slide thereon in a-direction at right angles to the slant of said inclined face, said bracket ha ving portions embracing the sides of the guide and being held by gravity firmly against the inclined flat face and the upper side thereof. e 26. (Ina grinding machine, a tool supportr 111g guide having an upper horizontal guiding edge and a bearing face extending downwardly from said edge.

'27. In a riuding machine, a pair of guides exten ing in line oppositely from the central plane of the machine, each having a downwardly extending bearing face and an upper guiding edge, and a tool-holding sup port mounted to slide on each of said guides and held by gravity against the upper edge thereof.

28. In a 'rinding machine, a pair of guides exten ing in line oppositely from the central plane of the machine, each having a face angularly disposed with respect to the horizontal and an upper guiding edge, a tool-holding support mounted to slide on each of said guides and held by gravity against the upper edges'thereof, and rack and pinion mechanism for reciprocating one of said supports on its guide, 1

29. In a grinding machine, a bed, worksupporting means including separable bear ings adapted to he changed on the bed, and independently movable toward and from one another, and a sleeve rotatably mounted in said bearings, having provisions for securing the work coaxially therewith.

30. In a grinding machine, a bed, and a work-sup 'iort crmsisting of a-sleeve having a central passage extending -thro hont its length, adapted to receive the WilfiK, means carried by the sleeve for clamping the work centrally therein, and a plurality of bearings adapted to be -1ecurcd to the bed in an one of a variety of positions, and in whio said sleeve is rotatably held.

31. In a grinding machine; a' bed, and a worlesupport, including separate bearings adapted to be moved togethe and apart and to be independently secured to the bed, a sleeve col'ltained in said'bearings, and collars on the sleeve adjacent the outer sides of the bearings, said collars having clamps for securing the work centrally therein.

32. In a grinding machine, a work-hold ing bed, a holder adapted to carry a hollow work piece a head overhanging the bed and haiiug a bearing, a griniiling tool spindle rotatably mountei'l in said. bearing and supported thereby so as to extend over theebcd and enter the work. piece with its axis in the same horizontal plane as the axis of the work, and means for :t'eeding the tool holder and tool horizontally.

3 In a rindiug machine, a work-holding bed, ahead overhanging the bed and ha ring a bearing, a grinding tool spindle rotatabiy mounted in said. bearing, and a. support of said head on which the same is movably mounted and arranged to be fed transversely of the spindle in a plane parallel to that of the axes of the spindle and work, whereby the point of contact of the tool and work is at the same height as the former wears and the latter is cut away.

34. In a grinding machine, a \\'ork-si.xpporting bed, a spln'ulle-oarrying head overhangingsaid bed, a spindle rotatably held in said head, and a grinder carried by said spindle, the head being adjustable verti' cally to bring the spindle axis to the level oi the axis of the work, and being hori. zontally adjustable transversely ot said axes to feed the tool toward the work.

35. In a grinding machine, a work-supporting bed, a spindle-carrying head over hanging said bed, a spindle rotatably held in said head, a grinder carried by said spindle, a rigid horizontal transverse guide, .and a slide mounted thereon; said head bein e} cured with provision for Vertical ad]ust:*

ment to said, slide.

36. In a grinding machine, a. work supporting bed, as indle-carrying head-over" hanging said he ,a'spindle rotatably held n said head, a grinder carried by said spm dle, a rigid horizontal transverse gu1de,-a

a bearing, a grinder spindle rotutably l in said bearing, a transverse guide on said head is enabled, to slide to it grinder, a nut secured to said guide, carried by said head in tln'eeded on ment with the nut, said. not hnving more tapped pass ,5; (meaning into i tln'euded bore, u quun if, of suit tel in said passage, and :1 not arrow in sage for forcing thesoj't metal again-it.

screw to take up bucldosh thereot 50. In. a grindii'lg nnuthine, a W01?ii-""" porting bed, urine having guides be above said bed, and {L plurality of {5 ing heads or brnoket mounted to slide pa "allel to the bed on ev guides.

51. In a grindii machine, porting bed, urine hmin above said bed, and :1 y mounted on said guides heads or secured to said slidee, n. gl'ilfit iltllf-ll(lili\- bars or shafts carrier, hende ii jecting therefrom to pulnit entrzm heads, e grindenspindle rotatable in said HIQ'S, and a pulley on said spindle con- I between said. heads; either or the hende being removable from the guide to ,lolunltof plec ng or remov ng a belt. 70

in a grinding machine, a W0I'k-SU1pin bed, a guide substantially paral e1 o, rt plurality of heads or brackets inombly held on said guide, bearings in said heads, u grinder spindle rotatable in said 15 u connection between said heads boo 'unereby they are held at a uniform distance unortand caused to move together on the ride, a pulley on the spindle between the n a belt passing over said pulle and a 80 in; drum parallel to the gui e, Over oh the belt passes, whereby movement of e hmds is permitted without removal of 58. In a grinding machine, a work-supporting bed, a guide, a, holder mounted on said guide movable thereon to ermit plac-' "l? the Work, a rinder spindle contained hollow WOllT piece, each slide :5. u ably in said .older, a pulley thereon,

approximately as fur beyond eaid i driving drum parallel to soul gulde and 6 as the bar or shaft utta hed thereto row. o us great len th as the normal range of being substantially coleiininono l'h l trm'ei of the ho der thereon, and a belt surwhereby the llilll or suite held il't'idlv ml' g Sold r ing r m and p lleyand lodsenese at their in ends uvoidedi. 59 In a grinding machine, a Work-sup- 52. In a machine of L ting bed, a. guide, a holder mounted on 95 scribed, a base, a curved column rh no; 'n lid guide movable thereon to permit placsuid base, and guides extendi of the work, a grinder spindle eontamed ment on opposite sides of inenid holder, and a stop for suppo ed thereby, said u.- the moven'lent of said holder on ed to hold one, or u I amid guide ton'nrd the worlt. 0o

holders. (in, .ln :1 grinding mitCllhlC, a work-supn bed, a guide, :1 holder mmmted on V 'l movable thereon to permit placbearns extenen'u, i i he Work, grinm epiudle contained 49 support, said urine or A v rot; Iftliil. id bolt and u stop on the 1 i surfaces for tool hold twi outer end or the holder or ing the end of 54;. In a machine of ti. charact r dew scribed, e su'miort, :u l bulur m A beams extending horifl support, said arms or bee "dovetail guide but 53. In mac-h scribed, a eup po 'ide, :tor limiting the movement of mud guide toward the Work.

in comprising in i v support, bearings fmid :iuunt ort l r holdin 1 a rotary ward from one edge th epindle, u spindle udupte to carry for supporting it tool mounte rotnrily contained in said bearzontelly on said doveiuil nor on wi 1 i holder, means for producing: I embracing the e i linul fouling movement it;

ried by the brnelte i end the grinder, means for side of suid guide adopted to 1 utu'leholdei' transversely me, against the some, inder as stock is removed from In a grindint; nuui- -;l means for feeding the spindle:

55 porting bed, at guide on us the latter becomes reducbd no thereto, a plurulity oi. 1 eter.

rule; of A, grinding machine, comprising-in movnbly held on said guide, b

heads, a grinder epindle i-olel'nbie mention a stationary support, a rindbearings, and. a split pull l tool and spindle therefor, a war said spindle between so! i port udaptcd to be moved arallel with e- 2.

hub contained in be e of said tool and spins a 2 e to on which the work-support is won and vahercon it movable to b i on i the rinder as stock is removed-trafl 56.111 u'griiufling n1 porting bed, at uide thereto, a plnrnlitv of; novably held on solid. 1

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