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.

Abstract: A self-centering, radially reciprocating jaw chuck for machine tools and the like comprising a chuck body member, a plurality of master jaws secured to the body member, each of the master jaws having a pair of circumferentially spaced fixed portions rigidly secured to the body member and a radially reciprocable portion positioned circumferentially between the fixed portions. Resilient means integral with both the fixed portions and the radially reciprocable portion connect these portions, and a work gripping member is secured to each of the radially reciprocating portions. Axially reciprocable means is provided within the body member for radially reciprocating the radially reciprocable portions, and work gripping members attached thereto, whereby flexure of the resilient means provides a self-centering action of the work gripping members with respect to the longitudinal axis of the chuck and the work.