The Model 450 precision air chuck for drill grinding has jaws made of air hardening tool steel 58-63 Rockwell "C" with brazed carbide inserts. The chuck grips 1/8 inch shank carbide micro drills designed for circuit board drilling, RTW grinds flutes to diameters down to .002 inches. Drills stack 3 boards at 3 holes per second at 100,000 rpm; T.I.R. = 1/10,000.

The company designs and manufactures precision pneumatic air and diaphragm chucks for any lathe, boring machine,  grinder or VMC. Models include through-hole, high-speed and quick-change chucks. Available in SAE or metric, in chuck sizes from 3" (76mm) to 18" (457mm) with accuracy of 0.001" to 0.00001" (0.254m). Custom workholding chucks and jaws are available, and free engineering and technical assistance is offered.

www.northfield.com