Centering clamping device for workpiece in machine tool has drive-side thread of dual thread spindle with greater core diameter than other thread for same thread rise

摘要

The clamping device (10) has a left-and-right-hand-thread spindle (3b) with right-hand thread (4) on one sector and left-hand thread (5) on another, and with nuts (12a, 12b), one of each hand thread, movable along the axis and connected to carriages (14a, 14b). The drive-side thread of the spindle has a greater core diameter than the other thread for the same thread rise.