High precision chuck for tool or workpiece - has axial clamping force of compression spring relieved to release work by finely adjustable screw jack with nut driven by externally rotatable worm

摘要

To allow control of the clamping force and release of the work or tool, the clamping force is relieved by a screw jack (16). The jack housing (15) abuts against a ring clip (24) in the chuck body on one side, and the jack plunger (19) bears against the pressure piece (9) on the other side. The jack plunger is in the form of a screw with a gear nut driven round by a worm. The shaft (26) of the worm passes through a transverse hole and can be turned from the outside to clamp or release the work. ADVANTAGE - Precise adjustment of clamping force.