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what is the difference between roller and ball bearing? Also, what is the diff between needle and ball bearing?
Specifically their properties and where they are used in ...
A roller bearing has rollers, they may be parallel cylindrical, or tapered, like in Timken races. They run on a plane race face.
Ball bearings use spherical balls running in semicircular grooves.
Needle bearings are a roller bearing, but the rollers are very fine cylindrical rollers, of the sort of diameter you might find sewing needles in. Most often, they are not supplied as a full race, but as an outer race and a caged set of needle rollers, that are used to support a hardened and ground shaft.
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