Lünette mit Fernmessung.

摘要

An automatic true centering steady rest apparatus (10) for a rotating cylindrical workpiece (88) during a machining or grinding operation on the workpiece (88). The apparatus (10) has an integrally mounted gaging device (82,109,111), for continuously gaging the diameter of a workpiece (88) during a machining or grinding operation. A pair of gripper arms (60,62) are slidably mounted on an operator body (44) in a housing (12). Each gripper arm (60,62) and the operator body (44) carries a workpiece contact member (50,74,76) engagable with the perimeter of the workpiece(88). The gripper arms (60,62) are urged to grip a workpiece (88) by the action of a pair of rollers (78,80) and two sets of fixed guide pins (90,91) (92,93) which are operatively engagable with camming contours (32,34) contained on opposing inner surfaces (32,34) of the apparatus housing (12). The improved efficiency of the apparatus (10), as a result of the roller and guide pin action allows for placing the gaging device remotely from the workpiece (88), without any loss in the precision of its measurement.