Air gaging is a non-contact means of precise comparative dimensional measurement which offers users the advantages of improved workflow, increased productivity, and decreased downtime. It is ideal for measuring dimensions with tolerances smaller than .005", and when gaging tight tolerances, a resolution as small as .000002" can be achieved. Its noncontact characteristic makes air gaging particularly useful for checking soft, highly polished, thin-walled or other delicate materials.
Air gages are most commonly used for measuring the size and form of inside diameters and outside diameters
Angle variation of tapered surfaces is commonly checked with air gaging as the difference of two diameters.
air nozzles configured as a “z” are used with dynamic measurement to change the back-pressure from square to out of square conditions.
With diameters, nozzles are typically diametrically opposed either internally for ID or externally for OD.
Multiple nozzles are equally located about the circumference of the air tool to allow for average size measurement.
A common application of air gaging is to dynamically measure the straightness or “bow” of an inside diameter.