Northfield’s model 450WHF chuck features a special four-port air tube and piston to enable open, close, autolube and air-detect functions. The top plate is a radial banking surface, which picks up the side of the part when it is loaded and twisted into position into the chuck.
The part rests against three small pads in the center of the chuck. The air-detect feature functions via holes in the pads to confirm that the part is loaded into the chuck.
The company’s air chucks are suited for lathes, boring machines, grinders and VMCs. Models include through-hole, high-speed and quick-change. Available in both SAE and metric sizes, the chucks range from 3" to 18" (76 to 457 mm). Accuracies range from 0.001" to 0.00001" (0.254 m).