US1586238A

US1586238A - Method and device for lapping gauges

Info

Publication number: US1586238A
Application number: US700299A
Authority: US
Inventors: Buckingham Earle
Original assignee: Pratt and Whitney Co Inc
Current assignee: Pratt and Whitney Co Inc
Priority date: 1924-03-19
Filing date: 1924-03-19
Publication date: 1926-05-25
Anticipated expiration: 1943-05-25

Description

May; 25 1926. 1,586,238

' E. BUCKINGHAM METHOD AND DEVICE FOR LAPPING GAUGES Filed. March 1-9, 1924 (Saab III 11m I TTOIMEY Patented May 25, 1926 UNITED STATES earur oiFFicE.

EARLE RUCRINGRAM; or nARTFoRn, CONNECTICUT, ASSIGNOR To PRATT & WHIT- NEY COMBA'NY, OF NEW YORK, n. Y., A coRroRATioN or new JER$EY.

METHOD AND DEVICE FQR LAFPING GAUGES.

Application filed March 19, 1924. Serial No. 700,299.

This invention relates to methods and deoperation serving to bring the gauging surfaces down to. their proper dimensions and shape and to polish the same to a smooth finish. The primary object of the present invention is to provide an improved method and device for performing this lapping op eration on internal taper gauges.

Another object ofthe invention is to provide an improved method and device for lappim internal taper thread gauges, such met ed and device comprising the support-c ing of a plurality of toothed lapping mem-' bers in a conical relationship and in threaded engagement with the gauge threads to be lapped, the arrangement of the parts being such that as a relative rotation is ct. fected between the gauge and the lapping niembere suchparts, because of their threaded engagement, also partake of a relative axial or longitudinal movement while the lapping members maintain their conical relationship and their threaded lapping enagement with the gauge.

\Vith the above and other objects in view, my invention consists in the features of construction and operation set forth in the, following specification and illustrated in the accompanying drawing. In such drawing annexed hereto and forminga part of this specification, have shown one en'ibodiment of my invention in connection with a device for lapping internal taper thread gauges but it will be understood that the invention can be otherwise embodied and that the drawing is not to be construed as defining or limit ing the scope of the invention, the claims appended. to this specification being relied upon for that purpose.

Referring to the figures 0t the drawing:

'Figure 1 is a fragmentary perspective view of a lathe showing an internal taper thread gauge being lapped thereon by my improved lapping device.

Fig. 2 is an enlarged side elevation thereof partially in section and broken away.

Sis a fragmentary perspective view member, the

of the guideway supporting.member for the gauge lapping members.

Fig. l is arraginentary view oi l one of the lapping members.

. Fig. 5 is a crosseection thereof on line 54-5 of Fig. 4.

Fig. 6 is anend view of the member for supporting one end of each of the lapping members. i p v Fig. 7 isan end view ofthe membershown in Fig. 3.

internal cylindrical gauges, both of the plain'and tl readed'type, can be lapped to an accurate and smooth finish without ditiiculty since the. lap used inthis operation is of the same diameter throughout its length and can therefore accomplish the lapping operation merely rotating and reciprocating the same through the gauge; Internal taper gauges however cannot be lapped in this manner and the lapping of such gauges is performed, with considerable difficulty.

In my present invention, plurality of lapping members in conically arranged guideways in a central supporting said conical. arrangement of the guideways corresponding to the taper oi the gauge'to be lapped. The gauge is mounted in lapping contact with these members and in the lapping operation the members are moved longitudinally along their guideways and through the gauge, first in one direction and then int-he opposite direction. Since the conical arrangement of the guideways corresponds to the taper'ot the gauge, the lapping members maintain their original position in lapping contact with the conical or taper gaugingsurface of the gauge throughout the longitudinal movement of the members. In the accom 'ianying drawing, 1 have illustrated my invention in connection .with the lapping of a thread gauge but it will be understood that the invention broadly contemplates the lapping of any gauge of the internal taper type.

"In the drawing, 1 indicates the headstock center and 2 thetailstock ce'nter ot a lathe on which is mounted the supporting arbor 3 of my improvedlapping device. Supported on the'arbor and preferably integral I slidably mount a I her 6 therein. Guiding plates 3, also preferabl secured to the sides of each member 6, are adapted to slide in slots 8 out in the member 6 adjacent and parallel with the ad jacent guideways 5.

face of each lapping member are adaptee to engage the threads of the gauge to be lapped.

The lapping members 6 are also preferably engaged at one end by a member 10 slidably mounted on one end of the arbor The flange por ion of this member is slotted at 11 to receive therein the slotted heads 12 of the lapping members, the cooperating slots being so formed that the members are free to move radially in thefiange. A hand wheel 13 is secured to the outer-end of the arbor adjacent the member 10.

The thread gauge 14 to be lapped is mounted on the lapping members with the gauging threads 1% thereof in threaded contact with the teeth 9. lVhen-assembled for the lapping operation, as shown in Fig. 1, the gauge is seated on a. member 15 secured to the face plate 16 of the lathe by means ofclamps 17. The'gauge is held down firmly on the member 15 by means of clamping members 18, the ends of which seat in holes in the gauge. By tightening the nuts 19, the gauge is forced tightly against the member 15. j

The headstock center 1 is freely slidable in a supporting sleeve 20 and can be adjusted axially therein by means of a nut 21 threaded to the center. Holes 22 are provided in the periphery of this nut and the nut can he Irotatably adjusted by inserting a rod through diametrically opposite openings 23 in'the member 12 and into these holes.

As illustrated in Fig. 2, the conical arrangement of the guideways 5 corresponds to the taper of the gauge to be lapped. Gauges varying in size but-corresponding in taper can be lapped with the same lapping device by adjusting the member 4c axially to bring the lapping members into accurate lapping contact with the gauge. Axial adjustment of the member to the left (Fig. 2) expands the lapping members and adjustment thereof to the right retracts such members. This adjustment is made by rotating the nut 21, the tailstock center 2 of course being adjusted in like manner whereby to properly engage and support the arbor- In the lapping operation the parts are assembled in the manner illustrated and described. Before beginning the lapping. movement, the nut 21 is accurately adjusted to bring the lapping members into accurate lapping contact with the gauge. The parts being so assembled and adjusted, the lathe is started. Rotation of the face plate 1? drives the gauge, the lapping device normally rotating as a unit with the gauge on the centers 1 and During such rotation, the

Transverscly extend. ing lapping teeth 9 formed in the outer suroperator retards the rotation of the lapping device by placing his hand on the hand wheel 13. Continued rotation of the gauge, because of its threaded engagement with the lapping members 6, moves th'elapping members longitudinally therethrough along their guideways 5 from the position shown in full lines in Fig. 2 to the position shown in dot and t ash lines. When the member 10 strikes the member a, all the parts, again rotate together as a unit. The operator now reverses the rotation of the face plate and, upon retarding the rotation of the lapping device, the parts are brought back to the position shown in full lines. Thus, the lapping operation is performed by reversing the rotation of the gauge and moving the lapping members back and forth there through. It will be understood that, since the conical arrangement of the guideways corresponds to the taper of the gauge, the lapping members maintain their lapping relationship with the gauge during their longitudinal movement therethrough.

hat I claim is: j

1. The method of lapping an internal taper gauge comprising supporting the gauge on a plurality of relatively long lapping members supported in a conical relationship corresponding to the taper of the gauge and providing a relative rotation and a relative longitudinal movement between the gauge and the said members While maintaining the membersin their said relationship and in lapping contact with the gauge.

2. The method of lapping an internal taper gauge comprising supporting the gauge on a plurality of relatively long lapping members supported in a conical relationship corresponding to the taper of the gauge and providing a relative rotationand a relative longitudinal movement between the gauge and the said members while moving the members bodily in a radial plane and holding the same in lapping contact with the gauge.

3. The method of lapping an internal taper gauge comprising supporting the gauge on a plurality of relatively long lapping members supported in a conical relationship corresponding to the taper of the gauge and providing a relative rotation and a relative longitudinal movement between the gauge and the said members while moving the members bodily in a radial plane without changing their said relationship and holding the members in lapping contact with the gauge.

4. The method of lapping an internal taper thread gauge comprising the supporting of the gauge on and in threaded contact with lapping teeth formed on a plural ity of relativelylong lapping members supif d a conical relationsh p correspond ing to the taper arelative rotation and 'a relative longitudiported of the gauge and providing nal movement between the gauge and the said members while maintaining the menu hers in their said relationship and the teeth thereof in threaded lapping contact with the gauge. I I j i p 5. The method of lapping an internal taper thread gauge comprisingthe support ing of the gauge on and in threaded contact with lapping teeth formed on a plurality oi relatively long lapping members supported in a conical relationship corresponding-to the taperof the gauge and providing a-relative rotation and a relative longitudinal movement between the gauge and the said members while moving the members bodily in a radial plane and holding the teeth thereotin threaded lapping contact with the gauge.

6. The method of lapping an internal taper thread gauge comprising the supportmg of the gauge on and'in threaded contact with lapping teeth formed on a plurality of relatively long lapping members supin a conical relationship correspond ing to the taper of the gauge and providing a relative rotation and a relative longitudinal movement between the gauge and the said members while moving the members bodily in a radial plane without changing their said relationshipand holding the teeth thereof in threaded lapping contact with the gauge.

7 The method of lapping an internal taper thread gauge comprising the supporting of the gauge on and in threaded contact with lapping teeth formed on a plural ity of relatively long lapping members supported in a conical relationship corresponding to the taper of the gauge and rotating the gauge and moving the said members longitudinally therethrough and in a radial direction bodily while maintaining the members in their said relationship and the teeth thereof in threaded lapping contact with the gauge.

8. An internal taper thread gauge lapping device comprising the combination of a plurality of relatively long lapping members havingtransversely extending teeth adapted to engage the threads of the gauge to be lapped and means within and supporting such members in a conical relationship corresponding to the taper of the gauge to be lapped, the members being free to slide longitudinally of the support and the arrangement of the parts being such that as a relative rotation is effected between the gauge and the lapping members sncl'i-parts, because of theirthreaded engagement, also partake of a relative longitudinal movement while the lapping members maintain their conical relationship and their threaded lapping engagement with the gauge.

, teeth adapted to'engage the threads "9. An internaltaper thread 'gauge'lapping device'comprising the combination of I a'member having a plurality of conically arranged guideways therein and a plurality of relatively long 1 gauge lapping l members respectively mounted to slide in the guideways and having transversely extending gauge to be lapped, the members being free to slide longitudinally of the support and the arrangement of the parts being'such that as a relative rotation isetiected between the gauge and the lapping members such parts, because of their threadedenga ement, also partake of a relative longitudinal movement and the lapping members move bodily in a radial direction while maintaining their conical relationship and their threaded lap ping engagement with the gauge.

l 10. An internal taper thread gauge lap ping device comprising the combination of a member having aplurality of conically. arranged guldeways therein,

a plurality of relatively [long gauge lapping members respectively mounted to slide in the guide' ways and having transversely extending teethadapted to engage the threads of the gauge to be lapped, and means movable relative to the-first named member and sup vporting one end of each of the lapping memhere, the members being free to slide longitudinally or" the support and the arrange ment of the parts being such that as a relative rotation is effected between the gauge and the lapping members such parts, because of their threaded engagement, also partake of a'relative longitudinal movement While the lapping members maintain their conical relationship and their threaded lapping engagement with the gauge.

11. An internal taper thread gauge lapin device com 'rism the combination of supported thereon and an arbor, a member having a plurality of conically arranged guideways therein, a plurality of relatively long lapping members having transversely extending teeth adapted to engage the threads of the gauge to be lapped and means slidably mounted on the arbor and supporting one end of each of the lapping mem bers, the members being free to slide longitudinally of the support and the arrangement of the parts being such that as a relative rotation is eiiected between the gauge and the lapping members such parts, be cause of their threaded engagement, also partake of a relative longitudinal movement while the lapping members maintain their conical relationship and their threaded lapping engagement with the gauge.

of the 12; An internal taper thread gauge lapping device comprising the combination of an arbor adapted to be rotatably supported on centers, a member supported on the arbor and having a plurality or conically arranged guideways therein, a plurality of 3 adapted to engage the threads of the gauge to be lapped, means slidably mounted on the arbor and supporting one end of each of the lapping members, and meansfor retarding the rotation of the arbor, the members being free to slide longitudinally of the support and the arrangement being such that as the gauge is rotated in one direction and the arbor held against rotation the lapping members, because of theirthreaded engagement with the gauge, will move longitudi- 15 nally through the gauge in one direction and will move longitudinally in the opposite direction when the gauge rotation 1s reversed, and the conical arrangement of the guideways correspond to the taper 0t 20 In testimony whereof, I hereto aliix my 25 signature.

EARLE BUCKINGHABL