GB933186A - Diamond truing device for helical surface grinding machines - Google Patents

Abstract

933,186. Truing grinding wheels. P. DURAND. Nov. 16, 1959 [Nov. 18, 1958], No 38757/58. Class 60. A device for truing cylindroconical grinding wheels for grinding helical surfaces comprises a diamond 2 mounted on a first spindle 1 for truing the conical surface, another diamond 38 mounted on a second spindle 28 for truing the annular face of the wheel, means for moving the first spindle to control the operative stroke of the diamond 2, to disengage it automatically from the wheel on completion of this stroke, to hold it clear during the return stroke, and to bring it to its original position, and means coupled to the first means for moving the second spindle 28 simultaneously with the first in a uniform to-and-fro radial stroke. The spindle 1 is traversed and quick-returned across the conical face of the wheel on guides 8 by a cam 10 acting against a spring 15. A spring 5 maintains contact between a roller 18 on a sleeve 4 around the spindle and a profiled template 16 during the cutting stroke of the diamond but the spindle carrier 7 is raised further towards the end of its travel by a toothed sector 19 of a lever 20 which contacts an adjustable stop 23. This stop also trips a bell-crank lever 21 to engage a stop carried by the other arm 22 with the underside of a projection 24, Fig. 2, on the sleeve 4, whereby the spindle 1 and diamond 2 is held out of contact with the conical surface of the wheel during the return stroke of the diamond carrier, an adjustable stop 25, Fig. 3, tripping the lever 21, 22 at the end of this stroke to allow the spindle 1 to return to its truing position. The cam 10 is motor-driven through spur gears and a worm gear 13, the spindle 28 of the second diamond 38 being reciprocated by the same motor which drives a cam 28a through a worm gear 36, 39, Fig. 2, to lift the spindle 28 against a spring 31. The housing 9 of the spindle 1 is supported by arcuate guides 27 to permit of angular adjustment on a bracket 26 which may itself be micrometrically adjusted vertically in relation to the wheel axis. Adjusting screws 6 and 37, Fig. 1, provide for the initial setting of the diamond holders 3 and 33; each diamond is detachably mounted in its holder.