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A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The main use of bearings is to support a rotating shaft. There are several types of bearings, with different principles and rolling elements, for example: Ball bearing and roller bearing.

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Bearing to allow a sphere to roll freely

I want to know what bearings might allow a sphere (5cm diameter) to roll in-place most freely. …
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Could linear bearings bear axial load?

Failing that, use two bearings and allow them enough movement so effectively each is just supporting a purely radial load. …
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