A bearing is a part of a machine that endures friction, often caused by a rotating part. A rotating ball produces less friction than two surfaces that are sliding against each other because there is less contact. Balls, or spheres, only contact the inner and outer race at a small point and because of this it cannot handle heavier loads without deforming. Roller bearings are cylindrical which means that the contact between the inner and outer races are a line, not a point. This allows them to support heavier loads without deforming.A ball bearing reduces rotational friction and supports radial and axial loads. It is composed of at least three races; one must be stationary and the other is attached to the rotating assembly. As the race moves, the balls move, and the load is transmitted through them. In aviation, ball bearings are used in airframe control systems, landing gear, engine mounts, APUs, navigation systems, etc. Different types of ball bearings are used for different applications due to their varying heat, stress, and load tolerance. Some bearings are capable of handling axial loads, radial loads, or some combination thereof.
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