Abstract: A collet assembly comprising a spring body member having a cylindrical rear portion and a plurality of spring fingers extending axially therefrom, with an annular bead on the external periphery of the spring fingers near the distal end thereof. Work gripping pads for gripping the exterior of the workpiece are mounted on each of the fingers, and the pads have a groove on the interior thereof for mounting the pads on the beads on the spring fingers. The pads have an exterior surface which forms a frusto-conical cam surface for cooperative engagement with an actuator sleeve, and the pads are free to rock slightly axially on the beads when the collet is opened or closed.Also disclosed are the spring body and the pads for use therewith.

Abstract: A machine tool dial assembly to enable readings indicative of the linear displacement of a machine element to be taken simultaneously in Metric and English units of measurement. The English dial is driven directly by the feed screw shaft and rotates in unison therewith. The Metric dial is mounted adjacent to and coaxially with the English dial and driven by means of the feed screw shaft through a gearing arrangement having an appropriate conversion ratio and comprising externally toothed driving and driven gears and a pinion gear in intermeshing engagement therewith. The dials are frictionally adjustable independently of the gearing arrangement and feed screw shaft by virtue of spring-biased friction shoes in contact with the inner surfaces of the dials.