The Sheffield Precisionaire Column from Precision Gage & Tool is the industry's most accurate, dependable, and widely accepted air instrument. While its truly modular design is adapted to the same proven principles used for many years, today's models are improved and simplified for increased reliability and operator convenience.

Dramatically lower costs
All gaging systems using Precisionaire Instruments can accurately inspect up to 40 or more part dimensions in the same time it takes to check one dimension with a conventional gage. Side-by-side columns form a "float graph" which can be viewed instantly. Conditions and relationships such as average diameter, camber, squareness and other measurements which
are extremely difficult to check are readily measured by Precisionaire systems.

With dependable air gaging, scrap is reduced, no usable parts are rejected, and many out-of-tolerance parts are salvageable. Inspection time is shortened, so overall production
time is reduced and machining processes can be brought under control more quickly.

In many cases, costly high-skill man hours can be better utilized, as air gaging requires a minimum of operator training and skill. Finally, air gage size-sensing elements outlast conventional limit-type gages many times, and, unlike many ordinary gaging methods, air gaging allows easy compensation for gage wear.

Internal or external measurement
A typical gaging spindle has a central air passage and diametrically opposed air jets. It gages
the true diameter of a hole based on the amount of clearance between the spindle and part
inside diameter (I.D.); any change in air flow is directly indicated as a dimension by the
float's position in the glass tube relative to the instrument's scale.

In the case of internal diameters, master setting rings have internal diameters equivalent to the minimum and maximum part tolerance limits and are used for calibration. For external checking, Airsnaps or Air Rings, with opposed jets, gage the part to indicate dimensional size. Master setting discs with external diameters equivalent to minimum and maximum part tolerance limits are used for calibration.

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