Flexibility of air gauging

Air gauges are often simpler and cheaper to engineer than mechanical gauges. They do not require linkages to transfer mechanical motion, so the ‘contacts’ (jets) can be spaced very closely, and at virtually any angle. This allows air to handle tasks that would be difficult or extremely expensive with mechanical gauging.

Gauging the straightness and/or taper of a bore is a basic application that benefits from close jet spacing. All it takes is a single tool with jets at opposite sides of the gauge’s diaphragm.  The gauge registers only the difference in pressure between the two sets of jets, directly indicating the amount of taper.