PLUNGER OPERATED ROTATABLE COLLET

摘要

A machine tool spindle characterized by excellent dynamic balance at very high rates of rotation and adapted for automatic tool changing has a tool-holding collet actuated by a plunger coaxial with the spindle. The plunger is maintained in the tool-holding position by belleville springs that rotate with the plunger and collet and a nonrotating push rod engages the plunger and drives it against the spring bias to open the collet when a tool is to be released or picked up. Advantageous embodiments of the invention, the collet draws air through a small conduit in the spindle, thereby cleaning dust from the collet fixture.