Northfield Precision Instrument Corp.'s DPH1000W, 10-inch diaphragm chuck is capable of locating and clamping two workpieces with different location datum. Due to production requirements, end user requested quick and accurate changeover between the workpiece numbers.

The chuck was manufactured with special stepped top jaws that could locate and clamp both workpieces without changeover. For end to end location difference between the workpieces, the chuck was manufactured with a master axial locator incorporating a "button" style stop (illustrated in orange) used for changeover. With replacement of only the button stop, changeover is quick, accurate and repeatable.