GB1400181A - Work-piece holding means or appliance for grinding machines - Google Patents

Abstract

1400181 Grinding LIVERPOOL TOOL & GAUGE Ltd 13 Sept 1973 [22 June 1972] 29213/72 Heading B3D An appliance for holding a workpiece, such as a cutting tool X, in a grinding machine comprises a cross-table assembly B located in a guideway 21 of a rotary table A, a slide C located in or on guides 27 in or on the crosstable and movable in a direction normal to the guideway of the rotary table, a cradle D for location in a selected one of a plurality of location means 33 of the slide, and a workpiece holder assembly E mounted on a pivot 37 of the cradle, the pivot being normal to the axis of the rotary table and parallel to the guides in or on the cross-table. The appliance permits compound angles and radii to be ground on the workpiece which is presented to a flat face or edge of a grinding wheel. The rotary table A consists of a circular table 11 which is supported by a ball race 13 from a flanged base 10 for rotation about an axis 12, the angle of rotation being determined by a stop 14 adjustable in a guide track 15 in the base and engageable with an adjustable abutment 21 on a bracket 25 secured to the table. The guideway 21 is formed chord-wise in the table 11 and receives the key-piece 20 of the cross-table B which is adjustable along the guideway by a lead-screw 22 having a graduated micrometer hand wheel 24 mounted in the bracket 25. The guides 27 on the cross-table receive the slide C which is adjustable along the guides by a leads screw 30 having a micrometer hand wheel 32. The plurality of location means in the slide C consist of T-slots 33 selectively engageable by a key-piece 34 of the cradle D which has a medial slot 35 defining lugs 36 receiving the pivot pin 37 supporting the workholder for angular adjustment about the axis of the pin to a position determined by adjustable screws 47 one each side of the pin. A clamp piece 43 is adjustable about a pivot 42 in the work-holder by a screw-and-slot arrangement (50, 51, Fig. 2, not shown) and is formed with a slot 44 in which the workpiece X is clamped by screws 45. The workpiece can thus be adjusted about the axes of pivots 37 and 42, radially by movement of the slide C, transversely by movement of the cross-table B, and swung about the axis 12 of the table 11. The pivot 37 is removable from the cradle to permit other work-holders to be mounted on the cradle, which work-holders may have tubular holders parallel to or transverse to the axis of the pivot 37.