Abstract: A collet adapter operates a draw-type collet in an axially stationary mode in a machine spindle that would otherwise operate with a stationary collet. The machine spindle has an axially stationary outer portion including a cap nut and an axially movable sleeve inside the axially stationary portion. The collet adapter includes an adapter body and a restraining apparatus. The adapter body has an outside surface that fits into the axially movable sleeve such that adapter body moves axially with the axially movable sleeve. The adapter body has an inside surface that receives the draw-type collet in sliding engagement. The restraining apparatus is configured to transmit an axial force from the stationary cap nut to a rearward portion of the draw-type collet to restrain axial motion of the draw-type collet.

Abstract: A collet adapter operates a draw-type collet in an axially stationary mode in a machine spindle that would otherwise operate with a stationary collet. The machine spindle has an axially stationary outer portion including a cap nut and an axially movable sleeve inside the axially stationary portion. The collet adapter includes an adapter body and a restraining apparatus. The adapter body has an outside surface that fits into the axially movable sleeve such that adapter body moves axially with the axially movable sleeve. The adapter body has an inside surface that receives the draw-type collet in sliding engagement. The restraining apparatus is configured to transmit an axial force from the stationary cap nut to a rearward portion of the draw-type collet to restrain axial motion of the draw-type collet.