Dunham Tool chucks, with a precision collet closer and collet actuator, are commonly used as a lathe chuck, as well as with cylindrical or surface grinders, rotary tables, machining centers and other equipment. Dunham will provide the spindle adapter to accommodate your workholding specification. This air lathe chuck is designed for absolute concentricity adjustability.

Dunham air collet chucks are designed for secondary chucking, not for through work, and accept all 5c collets and Dunham expanding internal collets for I.D holding from 1/4" to 6" diameters. Models are also available for 2j, 3j and 16c collets.

Adjustable concentricity screws permit adjusting to 0.0005" TIR. Internal stops eliminate length changes due to drawback. Foot or hand valves free hands for efficient part handling. A special air union permits spindle speeds to 3,500 rpm. Heat is not generated in the air collet chucks due to the external mounting of an air union.

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

• Uses only 1 air line through the spindle to lathe chuck
• Standard shop air operates air collet chucks
• Power factor: 15 times the pressure, i.e. at 100 psi line pressure exerts a pull force of more than 1,500 lbs. on collet air chuck
• Simple face plate mounting or special spindle mounts to suit customer requirements
• Built-in concentricity flange permits adjusting concentricity to new standards of collet accuracy improving TIR of all collets
• Collet gripping power can be uniformly controlled by regulating air pressure
• Lightweight - air collet chucks weighs approximately 9 lbs. No frictional heat is generated by lathe chuck