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Oct.. 8, 1946. A. M; BRAKE 2,409,113 . GAUGE LAPPING MACHINE `Filed June 27. 1944 » 4 sheets-sheet 1 Oct. 8, 1946. ,¢\_k M_ BRAKE 2,409,113 GAUGE LAPPING MACHINE Filed June 27, 1944 ' Egea’ 4 sheets-smeet s Get. 8, 1946. A. M. DRAKE GAUGE LAPPING MACHINEl 2,409,1 l 3 Filed June 27, 1944 4 Sheets-Sheet 4 /4 È / f M 2,409,113 Patented Oct. 8, 1946 UNITED STATES PATENT OFFICE 2,409,113 GAUGE LAPPING MACHINE Alden M. Drake, West Hartford, Conn., assignor to Niles-Bement-Pond Company, West Hartford, Conn., a corporation of New Jersey Application June 27, 1944, Serial No. 542,288; 11 Claims. (C1. 51-64) l 2 snap gauge having opposed flat parallel work parts of a lapping machine made in accord ance with the present invention and showing a standard form of adjustable snap gauge in posi tion for lapping operations upon its gauging engaging surfaces. surfaces. 'I'his invention relates to lapping machines and particularly to a machine for lapping gauging surfaces such as those of an adjustable More in particular the invention relates to a lapping machine for flat parallel surfaces in cluding means for mechanically holding a work piece in position with its surfaces being lapped , Fig. 2 is a view of a portion of the mechanism shown in Fig. 1 upon an enlarged scale and sec tioned to more clearly disclose the means for adjusting the parts of the work pie'ce being in contact with opposed ñat parallel faces of 10 lapped. Fig. 3 is a horizontal sec-tional view through the a lapping member, the lapping member being work piece adjusting means shown in Fig. 2. actuated while the work piece is free to adjust Fig. 4 is another view shown in side elevation itself relative to the lapping surfaces, and the of the clamping and adjusting means for the work piece being actuated relative to the lapping surfaces while being free to adjust itself rel 15 parts having their gauging surfaces lapped. Fig. 5 is a detail mechanism forming part of ative to the lapping member. the work restraining or positioning means dur Another object of the invention is to provide ing its actuation. s. means for actuating a lapping member having Fig. 6 is a side elevation in section of the ac opposed ñat parallel faces, these movements be tuating and mounting mechanism for the lapping ing in a direction transverse to its longitudinal member. axis while permitting the lapping member to Fig. 'l is a front elevation of the parts shown adjust itself angularly about its longitudinal , axis. in Fig. 6. c Fig, 8 is a detail sectional view taken on the Another object of importance is to provide v meansgfor actuating the work piece relative to the 25 plane of line 8-8 shown in Fig. 6, and Fig. 9 is a plan view of the work holder taken lapping member in a direction parallel to the on the plane of line 9_9 inFig. 1. longitudinal axis of the lapping member while In the above-mentioned drawings there has permitting the work piece to adjust itself to been shown .but one embodiment of the inven lapped against the lapping surfaces and to os 30 tion which is now deemed preferable, but it is to be understood that changes and modifica cillate about an axis normal to the surfaces being tions may be made within the scope of the ap lapped. pended claims without departing from the spirit And ñnally it is an object of the invention of the invention. to provide means for adjusting the gauging sur faces of the work piece being lapped relative to 35 Brieñy, andin its broadest aspect, the inven tion may include the following principal parts: the lapping member during the lapping oper First, a base; second, a horizontal spindle pref ation. erably adapted to be rotated at any appropriate With the above and other objects in view speed; third, an eccentric on the forward end the invention includes the features of construc tion and operation set forth in the following 40 of the spindle adapted to engage a horizontally slidable shoe mounted within a vertically mov speciiication and illustrated in the accompanying able slide so that rotation of the’spindle and drawings. eccentric will reciprocate the slide vertically a In the accompanying drawings annexed here short distance; fourth, a lap holding member to and forming a part of this specification, I 45 mounted within this vertical slide and preferably have shown the invention embodied in a machine adjustable laterally with minimum friction; iifth, for lapping the gauging surfaces of an adjust a lap mounted in this laterally movable >member able gauge adapted particularly for gauging the freely rotatable about its longitudinal axis; sixth, diameters of plain cylindrical parts, but it will ’ a reciprocatory arm actuated hydraulically or be understood that the invention can be other wise embodied and that «the drawings are not 50 otherwise in a direction parallel to the longitudi nal axis of the lapping member; seventh, a to be construed as defining or limiting the scope bracket secured to the outer end of said arm of the invention, the claims appended to this and having an opening therein extending hori specification being relied upon for that purpose. zontally in a direction normal to the direction In the drawings: . 55 of movement of said arm; eighth, a yoke member Figure 1 is a front elevation of the principal bear uniformly throughout its surfaces being 2,409,113 3 4 having a lateral extension engaging within the the lapping member I1. As the operating mech opening in the bracket; ninth, resilient means anism for this piston forms no part of this in retaining the yoke substantially in a vertical VentionI further description is not thought neces plane but permitting limited oscillatory move sary. At the forward end of this piston is a ment about the axis of the projection; tenth, a 5 laterally extended bracket 2| secured thereto and second yoke engaging the ñrst yoke for oscillat having a transverse horizontal opening extend ing movement about a substantially vertical axis; eleventh, work holding members within the sec end of the piston or ram 20 is secured thereto ond yoke member; and twelfth, means within the in iixed position but is free to be angularly ad ing therethrough. The bracket 2| at the free second yoke member for adjusting the parts >of 10 justed with the piston 20 about its axis. A for the work piece being lapped toward and from wardly extending bar 22 is provided in the base the lapping surfaces of the lap. »extending parallelly to and at one side of the The embodiment of the invention illustrated `piston 20 against which a roller 23 on the bracket is for lapping the work engagingsurfacesl of/an `2| Ymay_ride. V'This engagement of the roller 23 adjustable snap gauge. These surfaces> after-,the `15 with the rod or~bar 22 keeps the bracket 2| in gauge has been completely assembled‘are re position to support yoke members, presently to quired to be finished to an extremei precision as Jbe described'in position to engage the work piece to parallelism and flatness. Heretofore- this- op W »with the lapping member I'I. When not in eration has been accomplished by hand with a use, however, the bracket 2| may be swung to fixed lapping member-by moving the gauge over 20 an angularly inoperative position for changing the ‘surfaces `of vthev lap. The present ' machine -the yokes or to mount other types of work pieces. ~enables this cperatio'n'to'fbe 'accomplished 'me `The transverse opening in the‘bracket‘ZI .forms "chaînically, quickly 'an‘dftoV ‘a Thigh ' degree 'of La bearing fora yoke'24 having upper 'and' lower parallelism. " ' ‘ extending arms 25 and‘26, respectivelyyadapted Referring more in detail to the figures “of the 25 to retain another yoke member :'21 therein, 'The fdraw`in`gs',l`it ‘will be' seenithat the' drawings dis `yoke'Z?l has an extension 28 entering’theV open . close 'a machine for" actuating ’a ’ lap Ahaving `oping in the bracket 0r arm 2| about the axis of .`posed"flat parallel >surfaces while'perm’ittingad which the'yoke member‘24 may oscillate. 'As "'justme‘ntof the lap 'angularly‘ about its- longi shown inFigs. 1 and 9, arrns'25` and 26 are or tudinal axis, there also being AWork supporting go'may be integral with the central portion of yoke 'and actuating'means" associated' therewith. ' The VEil. Arms 29 and 33, Which mayform a' unitary mechanism for ' operating vthe 'lapping vmember member, are pivota'lly mounted relative to arms "Will'ñrst be described.Y 25 and 26' andare resiliently held toward'their 4By "reference'ñrst to Fig. 6 it will be seen closed position'relative to ar1ns^25 `and 26 ‘by that’a >horizontal extending . spindle "Ill is rotat 35 a spring 3| pressing fplunger 3| a against 'the `ablyinountedivithinabase' I I. ,'*Preferably this spindle I0 >may> be rotated by'a"hydraulic’variable `speed device either continuously’or"alternately _in opposite," directions. VAs’tlie‘'n'ieansfor‘‘rotat ing this spindle form no'partof vthev present 'in-v vention, further description of this ‘rotating "means and its ‘control is not‘thought'~to be necessary. At the forward end of this spindle central portion of the‘member forming the‘arms 28 and 29. In 'order to resiliently retain lthe-first yoke "member 24 in substantially vertical position dur'40 ing‘reciprocatory movements of the bracket 2| the yoke 24 has Yan arm 32'extending laterally and horizontally above the axis `of its horizontal ex tension 28. The end of this arm 32 engages Lbe I0 is'an eccentric |2‘exten`dìn'g'centrally'within tween two spring pressed plungers 33 mounted a bearing shoe- |3""movable 'horizontally ¿within `45 in the bracket 2|. The yoke memberï24, there `a slide‘ I4 which 'in'turn is “vertically movable on _suitable Ways provided on ~thei‘ront face'of the fore, is constrained Yto‘remain in-a substantially ?base. 'Laterally‘movable relative' to the vertical "pressure kof "light springs engaging plungers 33, Vvertical position but may oscillate against the the pressure-of which'may be adjusted lby screws ?slide Ili’is 'a horizontal’ slide` I5 ‘mounted with `ín` 'the' vertical slide. ‘From the‘above' described 50`34, forcing the "plungers 33 together-against op posite sides'of the/arm 32. 4mechanism 'it will be 'seenthat tlieïhorizontally movable' 'slide I5 Will‘be' reciprocated‘ vertically The second yoke member 21 referred to above Vwith the >vertically‘movable 'slide` i4 Íbutïwillîbe and which has its -upper and lower’extension 35 disposed vbetween thearms‘f25 and 26 of the first free to adjust itself laterally during 'this' vertical ,i'eciprocatory movement. " ` ' 55 yoke -member24-on‘one side'and armS’ZS'and/Sû ’on the opposite Vside is adapted Yto have a Work ‘ Witliînthe" horizontally Vmovable' slide" 'I5' is`a lap *holding Amember "It ` preferably îm'ounte'd for 'rotation upon'anti-fri'ction bearingsabout ahori ‘zontaliforwardly extending' axis lthat is parallel to the spindle '|û. Retained'in this holder ’i6 by 'any preferred"meansperm'itting convenient piece W clamped substantially centrally therein. --As the clamping -members may be of any `ap proved form, it is not- thought- that furtherde 60 f scription of them is necessary. Mountedon this second yoke’ member 21 -are adjusting and clamping means for the‘adjust able gauging members<`36 of the work piece AW, ' |'I. In“ the cmbodiment'ofjthe invention shown the 'drawings' the`lappin'g'm'ember ITis in the the work engaging surfaces of which are being form ‘of a"'rectangula1"'rod, 'opposite sides of 65 lapped. The particular embodiment ofthe in vention described in thedrawings is a snap gauge which'form'the lapping'surfaces. ‘This'rod I`| -for plain cylindricalfmembers, there being ka extends horizontally, 'is free to .adjust itself later ally and angularly‘about‘its longitudinal’axis, single anvil 31 alonglone side ofthe frame and ‘two independently adjustable-anvils or gauging andïis reciprocated by the"ve`rtical"slide' |13 and eccentric I2 in a vertical plane. '70 members 3S on the opposite side. The opposed ' The means for actuating the work piece W lsurfaces of the single» anvil1‘31'and the opposed relative to and during actuation of the lapping adjustable anvils 36 have dat parallel faces which member |`| comprise a piston ’20 shown in'Fig. 4are the surfaces lapped in thislappingmachine ‘1 which `may Ybe vre‘ciprocate‘d "hydraulically or_ and form the gauging or work >engaging surfaces 'Otherwise in'a 'direction'parallel ’to‘the’ axis ~of V75 'of-the» snap gauge -W; mounting ` and ` demoun’ting' is a' lapping' . member 2,409,113 In order to effect these adjustments of mem- . bers 36 during the lapping operation screw driver members 40 are mounted within the second yoke member 21, two of which engage the slotted ends of the adjusting screws 4l for the anvils 36 and the other two engage the ends of the clamping screws 42 for these anvil members. These screw driver members 4e are slidably mounted within portions of the yoke 21 and are normally pressed toward their anvil engaging positions by light springs 43. Hand levers 44 are provided for the screw driver member 4I] engaging the adjusting and clamping screws 4| and 42 so that these members V4l) may be quickly withdrawn from en gagement whenever desired. To rotate these screw driver members 4D to unclamp, adjust, and reclamp the anvils 35, gears while said lap is being reciprocated, means sup porting the work piece with surfaces being lapped contacting opposite surfaces of said lap, and means providing lateral adjustment of said work piece relative to said lap, whereby said work piece may adjust itself to the surfaces of said lap dur ing lapping movements of said work piece and lap. . 3. A lapping machine comprising in combina tion, mechanism for reciprocating a lap having flat parallel lapping surfaces, means providing adjustment of said lap in a direction normal thereto,~means for actuating a work piece having opposed parallel surfaces over the surfaces of said lap in a direction parallel to said lap while said lap is being reciprocated, means supporting the work piece with surfaces being lapped con tacting opposite surfaces of said lap, and means effecting oscillatory movements of said work piece relative to said lap during the lapping operation, gaged by other pinions 41 on shafts 48 rotatable 20 whereby said work piece may adjust itself to the manually by handles extending to the outside of surfaces of said lap during lapping movements the yoke member 21. By means of the pínions of said work piece and lap. 45-45 and 41 and the location of their support 4. An operating mechanism for the lapping ing shafts the handles 49 are spaced apart for member of a lapping machine comprising a ro convenient operation. tatable spindle having an eccentric at one end, In operation the lapping member l1 is recip a slide reciprocated thereby in a vertical plane rocated in a vertical plane and with the work normal to the axis of said spindle, a second slide piece W mounted in yoke 21, as shown, the brack mounted within said first mentioned slide for free et 2l is reciprocated horizontally in the di movement in a plane at right angles to the plane rection of the axis of the lapping member. This of movement of said ñrst slide, and a lapping 45 are provided on these members 40 in mesh with elongated idlers 46 which in turn are en movement induces a swinging movement of the yoke 21 and yoke 24 about the axis of the exten sion 2.8. This swinging movement is due to the fact that the support and operating connection member having opposite plane parallel lapping surfaces mounted in said second slide for free rotary movement about its longitudinal central for the yoke 24, that is the extension 28, is a ma 35 axis. 5. Work supporting and actuating means for terial distance above the axis of the lapping a lapping machine comprising in combination, a member. Also the lapping member l1 can free yoke member having a projection extending lat ly adjust itself laterally and angularly about its erally therefrom, actuating means engaging said axis. In addition the yoke 21 can swing about projection for reciprocating said yoke member, a 40 second yoke supported for oscillatory movements the axis of its upper and lower extensions 35. The result of these movements and adjust about an axis normal to the reciprocatory` move ments is to permit the surfaces of anvils 36 and ments of said ñrst yoke member, and work clamp 31 being lapped to bear evenly upon the surfaces ing means within said second yoke. of the lapping member I1. The pressure of these 6. Work supporting and actuating means for surfaces against the lapping member l1 may be a lapping machine comprising in combination, a adjusted during operation by means of the screw yoke member having a projection extending lat driver members 40 engaging the adjusting and erally therefrom, actuating means engaging said clamping members 4l and 42 for the anvils 36. projection for reciprocating said yoke member In this manner and with a lapping compound ap ~ while permitting oscillatory movements thereof, plied to the member I1 lapping can be continued a second yoke supported by said first yoke for until opposite fiat parallel surfaces are obtained oscillatory movements about an axis normal to on the anvils 36 and 31. the oscillatory movements of said first yoke mem What I claim is: ber, and work clamping means within said sec 1. A lapping machine comprising in combina . ond yoke. tion, mechanism for reciprocating a lap having '7. Work supporting and actuating means for flat parallel lapping surfaces, means providing a lapping machine comprising in combination, a adjustment of said lap in a direction normal to yoke member having a projection extending lat its direction of movement, means for actuating erally therefrom, actuating means engaging said a work piece having opposed parallel surfaces projection for reciprocating said yoke member over the surfaces of said lap in a direction par GO in a direction normal to said projection, a second allel to said lap, means supporting the work piece yoke supported by said first yoke member for os with the surfaces being lapped contacting oppo cillatory movements about an axis normal to the site surfaces of said lap, and means providing reciprocatory movements of said first yoke mem lateral adjustment of said work piece relative to ber, and work clamping means within said sec said lap, whereby said work piece may adjust it 65 ond yoke. self to the surfaces of said lap during lapping 8. Work supporting and actuating means for a movements of said work piece and lap. lapping machine comprising in combination, a 2. A lapping machine comprising in combina yoke member having a projection extending lat tion, mechanism for reciprocating a lap having erally therefrom, actuating means engaging said 70 flat parallel lapping surfaces, means providing adjustment of said lap angularly about its axis projection for reciprocating said yoke member horizontally while permitting oscillatory move ments of said yoke member about said projec tion, a second yoke supported by said first yoke having opposed parallel surfaces over the sur member for oscillatory movements about an axis faces of said lap in a direction parallel to said lap 75 and in a direction normal to its direction of movement, vmeans for actuating a work piece .2,409,113 normal to -the oscillatory movements of ïs'a'id -ñrst yoke member, and work clamping .means 'within said second yoke. Y 9. Work adjusting means for a lapping ma chine comprising in combination, a yoke ïmem ber, means to reciprocate saidydke member ïwhile permitting angular adjustments thereof, clamp ing means within said yoke member for a, work piece, and means mounted within said yoke member for advancing a part being lapped to ward a lapping «member during the .lapping op eration. 1'0. Work adjusting means for a lapping ma chine comprising in combination, a yoke mem bei', means to reciprocate said yoke member While permitting ‘angular adjustments thereof, clamp 8 ing means within said yoke member for a work piece, and meansmounted withinsaid yoke >mem ber for 'adjusting a part of the Work piece being lapped toward the lapping surface of the lapping member during Vthe lapping operation. 11. Work adjusting means for a lapping ma chine comprising in combination, a yoke mem ber., means to reciprocate said yoke member while permitting angular adjustments thereof, clamp ing means within said yoke member for a work piece, vmeans mounted Within said yoke member for adjusting a part being lapped toward the lapping member during the lapping operation, and means 'to clamp 'and unclamp said part. ALDEN M. DRAKE.