Northfield Precision Instrument Corporation (NPI)  recently developed their Model 625 sliding-jaw air chuck (0.0001" TIR) with special top tooling attached in response to a customer who needed grip on the IDʼs of their CVT transmission sheaves for runout inspection. 

Top jaws are permanently mounted onto the chuckʼs master jaws to grip the ID of the partʼs central bore. An air-detect axial locator (three air holes evident in its top surface) was incorporated to ensure proper seating of the part upon robot-arm placement onto the chuck. This chuck is capable of .0001" TIR total accuracy/repeatability on all critical surfaces that interface with the part.

NPI designs and manufactures air chucks for any lathe, boring machine, grinder or VMC. Models include through-hole, high-speed and quick-change. Chucks are available in SAE or metric, in sizes from 3" (7 mm) to 18" (457 mm). Custom workholding chucks and jaws are available and free engineering assistance is offered.