Northfield Precision Instrument Corp. specializes in developing custom solutions for difficult problems. In this particular case, Northfield designed a special version of its Model DPH-500 diaphragm chuck (.000010" TIR) with custom top tooling attached.

The center of this chuck has a deep bore that swallows and guides the tip of the part onto a spring-loaded center to support the part's tip while the part's underside rests on an axial locator (spider). Once clamped, the ODs of the turbo fins are ground to an exact tolerance.