An angular measurement of the direction of an object from a reference direction, such as true north.
A support mechanism allowing relative motion between two surfaces loaded against each other. This can be a rotary ball bearing, linear slide bearing, or air bearing.
Primarily two types: rolling element and sleeve or plain bearing. Rolling element bearings consist of four parts: an inner race, an outer race, balls or rollers, and a cage to maintain the proper separarion of the rolling elements. A sleeve bearing is a cylinder of alloy metal surrounding the rotating shaft. Contact between the shaft and sleeve is prevented by a lubrication film.
See also: Air Bearing, Axial Load Bearing, Axle, Ball Bearing, Bearing Life, Bearing Resolution, Brinelling, Clearance Bearing, Fluid Film Bearing, Force Feed Lubrication, Gas Bearing, Grease, Hinge, Hybrid Bearing, Hydrodynamic Bearing, Hydrostatic Bearing, Journal Bearing, Magnetic Bearing, Main Bearings, Needle Roller Bearing, Non-Contact Bearing, Oil Groove, Overhung Load, Pedestal Bearing, Plain Bearing, Porous Bearing, Relative Bearing, Roller Bearing, Rubbing Bearing, Self-Aligning Bearing, Slide Bearing, Step Bearing, Taper Roller Bearing, Thrust Bearing, Tribology, True Bearing, Trunnion Bearing.