
The simplest bearings are bearing surfaces, cut or formed into a part, with varying degrees of control over the form, size, roughness, and location of the surface. The term "bearing" is derived from the verb " to bear" a bearing being a machine element that allows one part to bear (i.e., to support) another. Bearings are classified broadly according to the type of operation, the motions allowed, or the directions of the loads (forces) applied to the parts. Most bearings facilitate the desired motion by minimizing friction.

The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts. ( June 2023)Ī bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.

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