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A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.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.
Split bi-material bushings: a metal exterior with an inner plastic coating A graphite-filled groove bushing. Plain bearings must be made from a material that is durable, low friction, low wear to the bearing and shaft, resistant to elevated temperatures, and corrosion resistant. Often the bearing is made up of at least two constituents, where ...
Working principle for a ball bearing; red dots show direction of rotation. A four-point angular-contact ball bearing. A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It ...
A composite bearing is a bearing made from a composite material, such as fibre reinforced resin, or plastic. These will often contain friction reducing ingredients such as PTFE but this is not the only material for reducing friction and wear and lubricating when the bearing is running dry (without external lubricants).
Frelon is a polytetrafluoroethylene (PTFE) based material with other proprietary fillers to increase bearing characteristics, such as low wear, low friction, and high strength. It is chemically inert and self lubricating. It qualifies as a class III plain bearing. [1]
Rulon 957, green speckled, bearing grade with noise dampening characteristics; Rulon XL, tan, low friction; suitable for aluminium; excellent outgassing characteristics for use in vacuums; Rulon F, green, polymer filled with excellent anti-abrasion characteristics; Rulon 142, aqua, low deformation material for used in linear bearings and slides
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