Rotierende Spannvorrichtung und Verfahren zum Einspannen und automatischen Drehen eines Werkstückes

摘要

A chuck body has an internal cam unit eccentrically mounted within antifriction bearings, and the cam unit includes a workpiece gripper. A radial pin extends through the chuck body into a peripheral slot of the cam unit. When rotating in a first rotary direction, the chuck body and cam unit rotate in unison and a first workpiece diameter may be machined. When the rotation of the chuck body is reversed, inertial forces acting on the cam unit prevent immediate reversal of the cam unit rotation, and the pin moves through the peripheral slot, contacting the opposite end and driving the cam unit in reverse rotation; this relative motion between the chuck body and cam unit causes the workpiece to become offset, displacing the first workpiece axis from the chuck body axis of rotation. Consequently, as the reverse rotation is continued, a second workpiece diameter may be is machined about the chuck axis of rotation; the second diameter will be eccentric to the first diameter.