Adjustable Concentricity screws permit adjusting to .0005" TIR.  Internal stops eliminate length changes due to draw back.  Fool-valve frees hands for efficient part handling.  Special air union permits spindle speeds to 3500 rpm.  Heat is not generatd in the "air collet" chuck due to external mounting of air union.

Collet sticking is elminated by spring-loaded piston.  Shop air pressure activates large piston, closing the collet.  The piston is spring-loaded and returns when air pressure is exhausted.