Northfield Precision Instrument Corp. introduces the Model DPH-800 double diaphragm chuck. On this custom-made chuck, the client had to grip on two different diameters (top and bottom). You can see two sets of jaws in the picture. The part was exceptionally long so Northfield had to manufacture the body out of a 220lb slug about 10 inches in diameter and 11 inches in length.

This chuck was extremely accurate, only running out about 1µm (on diameter) along the entire length of the chuck, which was more than 15 inches. The end user had to perform a grinding operation on the inside tapered bore of this part (a drive axel for a Volvo truck). This chuck also was designed with an air-detect feature so the machine will know when the part is properly placed in the chuck.