Abstract: A workholding fixture for clamping a workpiece for rotation about a selected axis comprising at least one throwblock for receiving a workpiece portion to be clamped, a clamp arm associated with the throwblock including a jaw at one end and a control surface at the other end, means for pivotally supporting the clamp arm intermediate the ends, means for selectively displacing the pivotally supporting means along an arc from a predetermined advanced position to a predetermined retracted position, means for pivotally displacing the clamp arm about the pivotally supporting means including cylinder means having bearing surface means selectively displaceable from a retracted position to an advanced position, the bearing surface means having a selected length to permit engagement with the control surface means as the pivotally supporting means and the bearing surface means are displaced between the advanced and retracted positions, and means for maintaining the bearing and control surfaces in engagement.

Abstract: A loader assembly for use with a machine tool comprising a drum-shaped carrier including a plurality of equispaced workpiece receiving recesses, means for selectively indexing the drum-shaped carrier, a workloading chute including means for sequentially advancing a plurality of workpieces to a selected one of the plurality of carrier recesses, and a loader mechanism including a housing supporting a pair of rams having gripper means at one end thereof, means for selectively displacing the rams intermediate retracted and advanced positions, the rams being selectively angularly related so that the center points of the gripper elements coincide at the advanced ram positions, and means for selectively displacing the gripper elements intermediate open and gripping positions, and means for selectively pivotally displacing the housing from a first position, whereat the coincident center points coincide with the centerline of the stocks of the machine tool to a second position, whereat the coincident center points coi