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Aug. 13, 1946. B. s. T. BISHOP ET AL - 2,405,551 GRINDING WHEEL TRUING APPARATUS Filed June v8, _ 1944 I 2 Sheets-Sheet ,‘L 'Jrew Aug~ 13,1946‘ B.- s. T. BISHOP‘ ET AL 2,405,551 GRINDING WHEEL TRUING APPARATUS Filed June 8, 1944 2 Sheets-Sheet -2 Patented Aug. 13, 1946 2,405,551 ~ UNITED STATES PATENT OFFICE 2,405,551 GRINDING WHEEL TRUDVG APPARATUS Benjamin S. '1‘. Bishop, Shrewsbury, and Frank A. Bicknell, Worcester, Mass, assignors to Leland Gifford Company, Worcester, Mass, a corpora tion of Massachusetts Application June 8, 1944, Serial No. 539,358 6 Claims. (01. 125—11) 2 This invention relates to improvements in grinding wheel truing apparatus. More particu mounted on a grinding machine. larly it relates to apparatus which may be in the form of an attachment for grinding machines and which can have its diamonds or other truing ele ments preliminarily accurately set in readiness of micrometric adjustment of the member on which the diamond-carrying arm is mounted, a plate of predetermined thickness is used, it being for a wheel truing operation at the will of the ma laid ?rst against one gage surface and then against the other gage surface and the diamonds To facilitate the setting of the diamonds without the necessity chine operator. being adjusted to bear against the plate surface It is an object of our invention to provide a wheel truing apparatus having separately mount 10 which, in one position, faces one diamond and, in another position, faces another diamond. ed truing diamonds, each separately movable into It is, moreover, our object to generally improve truing relation with a different face of the cut the structure and operation of apparatus for tru ting edge of the grinding Wheel, and each prelimi ing grinding wheels. narily set in its mounting means for correct pre In the accompanying drawings: cision traverse of a face of the cutting edge of the Wheel when moved by the operator to e?ect a truing of that face. We provide swinging dia 15 Figure l is a plan view of wheel truing appara— tus embodying features of our invention, shown mounted on a grinding machine forward of and mond-carrying arms, each swingable on an axis below the horizontal plane of the grinding wheel angularly related to the wheel face which is to be traversed by its diamond. Preferably the arms 20 axis; Figure 2 is an end elevation of the same with a are mounted on an adjustable member which can portion in section on line 2—2 of Figure 1; be secured on a suitable ?xed part of a grinding Figure 3 is a view similar to Figure 1 but with machine where the attachment, during periods of the diamond-carrying arms swung into truing re non-use, will not interfere with the regular and ' normal operations of the grinding machine. 25 lation to the grinding wheel; Figure 4 is a plan view of the truing appara However, the diamond-carrying arms are con tus mounted on the diamond setting ?xture; and stantly in readiness to be moved to bring each dia Figure 5 is an end elevation of‘ Figure 4 show mond in succession into truing relation to the ing one diamond carrying arm in’ position for set grinding wheel when the wheel is in a predeter ting its diamond with relation to the plate on the mined position with respect to the work driving spindle. gage face. I Referring to the drawings, an improved wheel Another object of our present invention is to truing device is shown as an attachment which provide means on the truing apparatus for mi can be mounted on a grinding machine in readi crometer adjustment of the arm-carrying mem ber in directions toward and from the wheel for 35 mess to perform a wheel truing operation at the will of the operator. In the embodiment herein predetermining the amount to be removed from each wheel face while preserving the preliminar ily set angular relation between an arm, its dia it which are threaded into nuts I6, engaged in mond and the particular wheel face which is to be dressed. 40 a T-slot 48 in the part I2 of the machine. Each nut i6 has a shank I‘! which extends out of the Still another object is to provide a diamond set T-slot and seats in a recess 20 in the under ting ?xture for preliminary precise setting of each side of base it] for ensuring a precision align diamond in its swinging arm. A base is provided ment of the base it relative to the T-slot H3. comparable to the base upon which the truing apparatus is to be mounted on the grinding ma 45 The base, between the bolts l4, I4 is formed at its under side with a wide groove 22 for receiv chine, so that the apparatus may be mounted on ing a slide member 24 which extends beyond the this ?xture precisely as it will be mounted on the base both forwardly as at 25 and rear-wardly as machine. A gage block is mounted on the ?xture at 28. At the forward projecting end of the slide ‘base and has a forward part formedwwith faces angularly related as are the faces of the cutting 50 there is mounted a block 35! on whose front face is the setting gage 32. The forward shank end edge of the grinding wheel which is to be trued. of a screw 5:38 extends loosely through the gage Hence the diamond in each swinging arm may be and ‘block with a graduated knob 35 on its ex set with relation to the proper gage face of the treme forward end for micrometer adjustment ?xture and will be accurately set with relation to a wheel face when the apparatus subsequently is 55 of the slide '24 by bringing particular graduations on the knob into register with a guide edge 38 2,405,551 3 4 below and forward of said gage, a pair of arms formed at the cut-out 40 of a plate 42 secured on the top face of block 39. rl‘he inner end of screw 34 is threaded into the forward part of pivotally mounted on said support and independ ently swingable on angularly related axes, a wheel truing element adjustably mounted on each said base l6 which serves as a ?xed nut coacting with arm, said arms being adapted to rest on said sup the screw for moving the slide relative to the Cl port in generally horizontal positions below and base when the screw is rotated. A vertical forward of the gage, and means for swinging one threaded stud d6 rises from the slide and ex said arm to bring its said truing element to posi tends through a‘slot 48 in base £9 with a nut tion for adjusting its setting relative to a said 50 on its upper end engaging the large diameter gage surface while the other arm continues in washer 52 for clamping the base and slide to gether in relatively adjusted positions. When its said generally horizontal position. 2. Grinding wheel truing apparatus comprising nut 50 is loosened the stud can move in slot 48 to permit adjustments of the slide. A set screw a ?xed gage having a tapered part with faces angularly related precisely corresponding to the 54 is provided in block 39 for locking screw 34 angular relation of the bevelled edge faces of against accidental rotation after a micrometer setting of the slide. a Wheel which is to be trued, a horizontal support below and forward of said gage, a pair of arms as in Fig. l, in crossed relation with arm 58 overlying arm 56 and having a shape for bridg ing arm 56 while its free end rests fiat on the surface ll of base it. Assuming a proper pre liminary setting of the diamonds 68, and a proper support in generally horizontal positions below The rearwardly projecting part 28 of the slide pivotally mounted on said support and independ has mounted thereon the two swinging arms 55, ently swingable on angularly related axes, a wheel 53, each carrying a diamond 68. truing element adjustably mounted on each said At times of non-use, the arms 5'6, 58 lie flat 20 arm, said arms being adapted to rest on said and forward of the gage, means for swinging one said arm toward said gage to bring its said truing element into a position for adjustment of its setting relative to said gage while the other arm continues in its said generally horizontal adjusted relation between the slide member 24 and wheel iii, the wheel may be trued by merely position, and graduated means for adjusting said causing the diamond-carrying arms 55 and 58 to traverse the faces of the grinding wheel which is being trued. The preliminary setting of the diamonds in the arms 55, 53 may be accomplished prior to mount ing the truing apparatus on the grinding ma support toward and from said gage to set the 30 chine. A special ?xture is provided comprising a base ‘ill having a top surface comparable with the machine surface on which the apparatus ulti mately is to be mounted. The base 1i] has a T~slot '12 out of which the special nuts Hi can project and seat in the recesses 26 in the under truing element relative to said gage and, subse quently, to set the set truing element in any of various selected positions backward from the posi tion of its setting relative to said gage, thereby to set the truing element for precision truing of a grinding wheel operating on work of any par ticular diameter. 3. In a grinding machine having a grinding wheel and having a ?xed horizontal surface below and forward of the wheel above which surface is the work position of the machine, wheel truing side of the base if! of the truing apparatus, pre 40 apparatus comprising a horizontal base adapted cisely as has been described in connection with to be mounted on said fixed horizontal surface the mounting of the apparatus on a machine. below and forward of the grinding wheel, a pair The bolts M engage the nuts iii to clamp base of arms pivotally mounted on said base and in Hi on base ‘IE with the slide member 24 pro 45 dependently swingable on angularly related axes, jecting fore and aft of base it as previously a wheel truing element mounted on each arm, said arms being adapted to rest idly on said base described. Base ‘56, however, projects rearwardly beyond in generally horizontal positions when a grinding the slide and has mounted on its rear portion operation is being performed by said wheel on the upstanding member ‘it on whose top is se 50 work in said work position, and means for swing cured a gage plate 76 having its forward part ing one said arm independently of the other arm shaped to provide the angularly related faces to bring its said truing, element into truing en i8, 8% corresponding in position and angle to the gagement with the grinding wheel when said work faces (it of the grinding wheel 44. Hence, position is vacant. ' 4. In a grinding machine having a grinding by setting the diamonds ?t in arms 56, 58 for 55 wheel and having a horizontal surface below and proper traverse respectively of faces 18 and 88, the diamonds will be properly set for truing wheel forward of the wheel above which surface is the 4-3 when the apparatus is mounted on a grind work position of the machine, wheel truing ap ing machine. Preferably, instead of setting the paratus comprising a horizontal base adapted to diamonds for traversing the faces ‘58, 833 of plate be mounted on said horizontal surface below and ‘53, a loose bar or plate 82 is provided which can forward of the grinding wheel, a pair of arms pivotally mounted on said base and independent be laid against the faces ‘E8, 80 in succession ly swingable on angularly related axes, a wheel thereby to project the angle of face so that the truing element mounted on each arm, said arms diamonds may be set relative to the outer surface being adapted to rest idly on said base forwardly of bar 82 without adjusting slide 24. rI‘he herein disclosed simple yet accurately of the grinding wheel and below the said work position when a grinding operation is being per effective means for truing a grinding wheel enables the truing elements, correctly and ac formed by said wheel on work in said work posi curately set, to be ever ready in a non-inter tion, with one said arm crossing over the other, means for swinging said crossing over arm to iering position, for use when needed ing a fixed gage having a tapered part with faces bring its truing element into truing engagement with the grinding wheel when said work position is vacant, and means for subsequently swinging angularly related precisely corresponding to the said other arm to bring its truing element into angular relation of the bevelled edge faces of a wheel which is to be trued, a horizontal support truing engagement with the grinding wheel. We claim as our invention: 1. Grinding wheel truing apparatus compris 5 2,405,551 5. In a grinding machine having a grinding wheel mounted for rotation about a horizontal axis, wheel truing apparatus comprising a plu rality of arms each pivotally mounted for swing ing about an axis disposed in a horizontal plane substantially below the horizontal plane of the axis of said grinding wheel, said arms being adapted to rest in idling positions in which both arms extend approximately in the horizontal 6 ing an arm pivotally mounted on a horizontal pivot for swinging movement between an idle position in which the arm rests approximately in the horizontal plane of its axis of swinging forwardly of and below said grinding wheel, and wheel truing positions in which the arm is ad ~jacent peripheral regions of the wheel, a wheel truing element mounted on said arm outward from its axis of swinging, means on said arm plane of their axes, with one arm extending across H) for swinging it thereby to cause said Wheel truing the other, and a truing element on each said arm, element to traverse a said peripheral region of each said arm being swingable about its pivot from its said idling position to bring its said truing element into truing engagement with the the wheel, and graduated means for moving the said arm bodily toward and from the grinding wheel a predetermined amount thereby to set the grinding wheel. 15 truing element selectively for truing the wheel 6. In a grinding machine having a grinding working on any of various diameters of work. wheel rotatably supported for rotation about a, BENJAMIN S. T. BISHOP. horizontal axis, wheel truing apparatus compris FRANK A. BICKNELL.