GB489519A - Improvements relating to grinding wheel truing devices for grinding or abrading machines - Google Patents

Abstract

489,519. Trueing grinding wheels. CHURCHILL MACHINE TOOL CO., Ltd., and ASBRIDGE, H. H. March 31, 1937, No. 9126. [Class 60] A profiled grinding-wheel d is trued by a diamond tool o carried by a bracket n which is pivoted about a vertical axis in a carriage m slidable, longitudinally of the machine, on a bracket k which is adjustable, transversely of the machine, on a carriage h which is slidable transversely of the machine, in one direction by a hydraulic plunger i and in the other by a spring w, on a member f which is adjustable, longitudinally of the machine, on the work table a, which latter slides on the machine bed to carry the work piece e, such as a ball race, up to the wheel d. A pinion p on the bracket n, coaxial with the pivotal axis of the latter, meshes with a rack q on the bracket k, and the carriage m is urged towards an abutment s on the grinding head by a spring r. In operation, as the table a approaches the wheel-trueing position, the carriage h is moved forward by the plunger i to engage a micrometer stop u on the member f, and the carriage m is arrested by the abutment s. The continued movement of the bracket k with the table a produces, through the rack- and-pinion gear, a turning of the bracket n. When trueing is completed, the carriage h is moved rearwards, thus also disengaging the carriage m from the abutment s. As shown in Figs. 1 and 2, the tool o is carried rigidly by the bracket n, and thus trues the wheel d to a circular profile. As shown in Figs. 4 and 5, however, the tool o is mounted in a holder n<2> which is pivoted about a horizontal pin 2 in the bracket n and which is urged by a spring 3 against a former 5 secured on the carriage m. Thus the tool o receives from the former 5 an additional movement towards or away from the wheel d so as to true the latter to a profile other than circular. According to the Provisional Specification, the tool o may be slidable against spring pressure in the bracket n and engage at its rear end with a former. Specification 424,261 is referred to.