US2292947A - Grinding wheel truing apparatus - Google Patents

Description

Aug. 11., 1942. L, A. KAsPARsoN ETAfL 2,292,947 I GRINDING WHEEL TRUING APPARATUS Filed July 23, 1941 /DHN ENRE/DE Aug, 11, `194:2.

il.. A. KAs'PAR-soN Er An 292,947

GRINDING WHEEL TRUING APPARATUS Filea July 2s, 1941 2 sheets-smet 2 Patented Aug. 1,1, 1942 2,292,947 GRINDING WHEEL TRUING APPARATUS Lennart A. Kasparson, Worcester, and John l. Garside, West Boylston, Mass., assignors to Norton Company, Worcester, Mass., a corporation of Massachusetts Application July 23, 1941, Serial No. 403,738

3 Claims.

The invention relates to grinding machines, and more particularly to a grinding wheel truing apparatus.

One object of the invention is to provide asimple and thoroughly practical double angle grinding wheel truing apparatus. Another object of the invention is to provide an improved angular grinding wheel truing apparatus in which a p air of diamonds or truing tools are arranged for an angular traversing movement to true either a cylindrical face or to true diverging angular faces on a grinding wheel.. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordinglyconsists in the features of construction, combinations of elements,

` and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will beindicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a fragmentary cross sectional view through a grinding machine, illustrating the improved grinding Wheel truing apparatus in elevation and showing the grinding wheel feeding mechanism partly in section;

Fig. 2 is a plan view, on an enlarged scale, of the grinding wheel truing apparatus;

Fig. 3 is a fragmentary front elevation, on an enlarged scale, of the improved grinding wheel truing apparatus;

Fig. 4 is a vertical cross-sectional view, taken approximately on the line 4--4 of Fig. 2;

Fig. 5 is a fragmentary cross sectional view, taken approximately on the lirre 5--5 of Fig. 4; and

Fig. 6 is a fragmentary plan view, showing the relation of the truing tools and their paths of travel to the operative face of the grinding wheel.

A grinding machine has been illustrated in the drawings comprising 'a base I0 having a transversely movable grinding wheel slide II mounted on the usual V-way and flat way (not shown) on the base I0. 'I'he wheel slide II serves asta support for a rotatable grinding wheel spindle I2 which in turn serves as a support for a rotatable grinding wheel I3. The grinding wheel spindle I2 may be driven by any suitable source of power, such as those well known in the art, that is, either an. electric motor mounted on the Wheel slide II, or an overhead drive shaft. A driving belt Il transmits power from the that shown in the prior U. S. patent to Charles source (not illustrated) to a pulley I5 mounted on the end of the wheel spindle I2.

` wheel 25.

H. Norton, No. '762,838 dated June 14, 1904, to which reference may be had for details of disclosure not contained herein. This feeding mechanism may comprise a depending half nut I6 which is fixedly mounted on the under side of the Wheel slide II and meshes with a rotatable cross feed screw I1. 'Ihe cross feed screw I1 is journalled in bearings (not shown) in the base I0. The forward end of the feed screw I1 is slidably keyed Within a rotatable sleeve I8 which is journalled in a bearing surface I 9 formed 'within the base I-Il. Y

A shaft 20 is formed integralwith the sleeve I8 and is journalled in a bearing 2I formed in the base I0. A gear 22 is mounted on the outer end of the shaft 20 and meshes with a pinion 23. The pinion 23 is rotatably supported on a stud (not shown) to rotate with a gear 24 which is formed as a part of a manually operable feed A micrometer wheel feed adjusting mechanism 26 is provided whereby the infeeding movement of the grinding Wheel I3 may be stopped in a desired adjusted'position.

A longitudinally reciprocable Work supporting table 21 is slidably supported on a flat way 28 and a V-way 29 formed on the upper surface of the base I0 to support the table 21 for a longi- .tudinal reciprocatory movement relative tothe base I0. The table 21 serves as a support forga rotatable work supporting mechanism and; also as a support for a truing apparatus to .-be here.- inafter described. The table 21 is arranged to be traversed longitudinally by means of a rack bar 3I depending from the under side of the table 21 by means of either a power operated or a manually operable traversing mechanism (not shown) such as, for example. substantiallythe same as that shown in the prior expired patent to Norton above referred to. l y

The improved truing apparatus comprises a pair of angularly adjustable and traversable diamonds or truing tools which are supported so that the entire assembly may be moved trans'- versely in a path substantially normalv to thev pivotal axes of the two angular 1 adjustxrie to facilitate truing two angular operative fai" on the periphery of a grinding wheel` I3 A improved truing apparatus comprisesgal-Q plate 40 which is preferably clampedto the upper surface of the table 21 by bolts 4I and 42 (Figli), A dovetailed slideway 43 (Figs. 2 and 3) is formed movable slide 55. The clamping vided with a frusto-conically shaped portion 11 which passes through'the frusto-conical aperture "13 in the stud 1|.

apparatus may be' adjusted transversely relative to the machine to position the truing apparatus in the desired position relative to the grinding wheel I3.

'I'he platen 44 serves as a support for a pivotally mounted plate 48 which is pivotally supported on a tapered stud 49 (Fig. 4). Clamping screw 45, the platen 44 supporting the truing screws 50 and 5| are provided for clamping the plate 48 in adjusted position. The clamping screws 50 and 5| pass through elongated arcuateshaped slots 52 and 53 formed in the plate 48 and are screw threaded into the transversely movable supporting platen 44. The platen 44 is provided with a graduated scale 54 to facilitate angular adjustment of the plate 48 as desired. It will be readily apparent from the foregoing disclosure that the plate 48 may be readily adjusted angularly by loosening the clamping screws 50 and 5| and then swivelling the plate 48 to the desired angular position, after which the plate 48 may be readily clamped in adjusted position by tightening the clamping screws 50 and 5|.

A dovetailed slideway 54 is formed on the upper surface of the plate 48 and is arranged to extend in a direction normal to the path of transverse adjustment of the platen 44 when the platen 48 is set at zero according to the scale 54. A longitudinally movable slide 55 is provided having a dovetailed slideway formed on its under surface which mates with lthe dovetailed slideway 54. In order to facilitate a longitudinal traversing movement of the slide 55, a rotatable feed screw 58 is journalled in a bearing 51 formed in an end cap 58 supported at one end of the platen 48. 'I'he screw 56 meshes with or engages a nut 59 depending from and formed integral with the under side of the slide 55.

A manually operable traversing mechanism is provided for the feed screw 56, comprising a bevel gear 60 which is fixedly mounted on therighthand end of the feed screw 56 (Fig. 2). The bevel gear 60 in turn meshes with a bevel gear 6I which is flxedly mounted on a rotatable shaft 62. The shaft 62- is journalled in a bearing 63 carried by a projecting portion 64 of the end cap 58. A manually operable hand wheel 65 is mounted on the outer end of the shaft 62. It will be readily apparent from the foregoing disclosure that a manual rotation of the hand wheel 65 will be transmitted through the gears 6| and 60 to rotate the feed screw 56 so as to traverse the slide 55 longitudinally relative to the supporting plate 48.

The longitudinally movable slide 55 in turn supports a swivel head 10. The swivel head 10 serves as a support for a pivot stud 1I (Fig. 4) which passes through a central aperture 12 formed in the longitudinally movable slide 55. The stud 12 is provided with a frusto-conically shaped aperture 13. A clamping bolt 14 having a threaded portion is screw threaded into an aperture 16 formed within the longitudinally bolt 14 is prol 'Ihe aperture 13 is larger in size than the frusto-conical portion 11 of the clamping bolt 14. It will be readily apparent from the foregoing disclosure that when it is desired to clamp the swivel head 10 in adjusted position, the binder or clamping screw 14 may be tightened so that the frusto-conical portion 11 is moved toward the right, thus producing a wedging action and causing a downward pull upon the pivot stud 1I to clamp the head 10 in the desired adjusted position. 'I'he swivel head 10 is provided with a graduated scale 18 on its peripheral surface. An index point 19 is provided on a cylindrically shaped portion of the longitudinally movable slide 55 to facilitate angular adjustment of the head 10 to the desired position.

The swivel head 10 is provided with a transversely extending V-Way comprising a pair of angular positioned plane surfaces 80 and 8I which serve as a support for a transversely movable slide 82. The slide 82 is provided with a V- shaped slideway having surfaces mating with the surfaces 80 and 8| of the swivel head 10. A nut and screw mechanism is provided for traversing the slide 82 transversely relative to the swivel head 10, comprising a rotatable feed screw 83 which engages or meshes with a threaded aperture 84 within the slide 82. 'I'he screw 83 is journalled in a bearing 85 which is supported in.fixed position on the swivel head 10. A gear 86 formed integral with the feed screw 83 meshes with a gear 81 which is fixedly supported on a rotatable shaft 88. The shaft 88 is journalled in bearings 89 and 90 which are supported in fixed relationship with the swivel head 10. A manually operable wheel 9| is mounted on the outer end of the shaft 88 by means of which the gear 81, the gear 86, and the feed screw 83 may be rotated as desired to traverse the slide 82 transversely relative to the swivel head 10.

In order to maintain the slide 82 in sliding engagement with the V-Way 80-8I, a shoe 92 extends longitudinally along the upper surface of the slide 82 (Fig. 4). A plurality of adjusting screws 93, 94 and 95 are provided for manually adjusting the position of the shoe 92 so that the slide 82 may be maintained in sliding engagement with the supporting ways without any lost motion. A pair of pull screws 96 and 91 are provided to cooperate with the screws 93, 94 and 95 to facilitate adjustment of the shoe 92,

A stud 98 mounted on the upper end of the pivot stud 1| is located Within a groove 99 formed in the under surface of the slide 82. It will be noted in Fig. 4-that the groove 99 extends only part of the length of the slide 82 and is arranged to limit the transverse movement of the slide 82 in either direction.

'I'he slide 82 serves as a support for the truing tools. A truing tool head |00 is xedly mounted on the forward end of the slide 82 and is arranged to serve as a support for a pair of diamonds or truing tools IOI and |02 which are arranged to true two angularly disposed adjacent faces |03 and |04 (Fig. 6), respectively, on the grinding Wheel I3.

The operation of this improved truing apparatus will be readily apparent from the foregoing disclosure. The supporting platen 44 is rst transversely adjusted to position the truing apparatus with respect to the grinding wheel I3. The swivel platen 48 is then adjusted angularly to the desired extent so that when the hand wheel 65 is rotated to produce a longitudinal traversing movement of the slide 55, the truing tool I0| will travel in a direction indicated by the arrow-headed broken line (Fig. 6), after which the clamping screws 50 and 5| are tightened to lock the swivel plate-40 in the desired adiusted position.

Similarly, the swivel head may be adjusted angularly relative to the longitudinally movable slide 55 so that the truing tool |02 will travel in av path indicated by the arrow-headed broken line |00 to true the face |03 of the grinding wheel I3. The swivel head 'I0 may then be clamped in adjusted position by tightening the binder bolt or screw 14.

The grinding wheel I0 may then be trued by rst rotating the hand wheel 55 to traverse the slide 55 longitudinally to traverse the truing tool I0| across the face |04 of the grinding wheel I3 (Fig. 6). After the faoe|04 has been trued to the desired extent, the truing tool |02 may be traversed transversely by rotation of the hand wheel 9| to true the face |03 of the grinding wheel I3. Before or during the truing operation,the grinding wheel I3 may be advanced to compensate for wheel wear to present'th'e face of the grinding wheel I3 fora truing operation by adjustmentv of the micrometer feed device 26 and rotation of the feed wheel 25 and feed screw It will be readily apparent from the foregoing disclosure that either a cylindrical face, a single angular face, or a pair of angular faces of the desired degree may be trued upon the periphery of a grinding wheel I3. It is merely necessary to adjustthe path of travel of the longitudinal slide 55 and the swivel head 10 to obtain the desired traversing movement of the truing' tools IOI and |02 to generate the desired operativel face on the grinding wheel I3.

It will thus be .seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and a movable slide to pass one of said diamonds across i as many changes might be made in the embodiment above set forth, it is tobe understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim: l Y 1. In a grinding wheel truingapparatus having a base, a'longitudinally movable slide thereon, a transversely movableslide on said longitudinally movable slide, means adjustably to swivel said longitudinally movable slide relative to said base, means adjustably to swivel said transversely y movable slide relative to said longitudinally movable slide, and a truing tool head on said transversely` movable slide having a pair ofspaced truing tools which are arranged repeatedly and successively to true angularly disposed faces ona grinding wheel when the longitudinal and transversely movable slides are traversed with'out angular readjustment of said slides.

2. In a grinding wheel truing apparatus having a base, a longitudinally movable slide thereon, a

transversely movable slide on said longitudinally movable slide, means adjustably to swivel said longitudinally movable slide relative to the base. means adjustably to swivel the transversely mov"- able slide relative to the longitudinally movable slide, a truing tool head on said transversely movable slide having a pair of spaced truing tools thereon, means to traverse said longitudinally an angular face of a grinding wheel, and means to traverse the transversely movable slide to traverse the other of said diamonds across a second angularly disposed operative face on the grinding wheel, said slides and truing tools being arranged so that predetermined angular faces on the grinding wheel may be repeatedly and successively trued without readjustment of the slides or truing tools. y

3. In a grinding Wheel truing apparatus, a base, a transversely movable slide thereon, an angularly adjustable platen on said slide, a longitudinally traversable slide on said platen, an angularly adjustable head on said slide, a transversely traversable slide on said head, and a truing tool head having a pair of` truing tools which are arranged to true diverging angularly disposed faces on a grinding wheel when the longitudinally and transversely movable slides are traversed, said slides and truing tools being arranged so that predetermined angular faces on the grinding wheel may be repeatedly and suc

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