Collet 1, serving to locate and clamp the workpiece by its external cylindrical surface, is actuated by wedge 2 which is mounted rigidly on piston rod 3. When piston 4 is moved to the left by the action of fluid delivered to the right end of cylinder 5, the workpiece is clamped. Adjustable stop 6 locates the workpiece in height. Spring 7, bearing against sleeve 8 which is screwed into collet 1, pushes the collet to its upper position when piston 4 is moved to the right by fluid delivered to the left end of cylinder 5.
$3888$LHP,GC$