Glossary

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Term	Definition
Accuracy	The difference between a measured value and the actual value. ABTech certifies component and system accuracies using a variety of tools, including master gage blocks, quartz straight edges, master test balls, laser interferometers autocollimators and electronic levels, all routinely calibrated and traceable to NIST. ABTech also manufactures gages and masters used for calibration and certification.
Aerostatic	Another term for "air" when defining a type of bearing. As in "aerostatic bearing".
Air Bearing	A bearing design that uses the lifting forces of a continual supply of compressed air (or nitrogen) to "float" one surface over another. Air bearings provide a nearly friction-free load bearing interface delivering exceptionally smooth motion and ultra-precision accuracy. Without mechanical contact between the surfaces, air bearings eliminate wear, require no lubrication or maintenance, and are highly repeatable, enjoying longer service life than mechanical alternatives.
Angular Accuracy	The measure of how much the axis of a rotating part deviates from a theoretical perfect axis. Also called coning error or wobble. The error is stated in either an angle (arc seconds or microradians) or as the distance between the two axes at a defined height above the part in the axial direction (typically in microinches/inch for air bearings).
Axial Accuracy	The measure of the deviation (or error) of a rotating part in the axial direction (parallel to the rotating axis).