Jewel bearing

In wheels where friction is critical, a capstone is added on the end to prevent the shoulder of the shaft from bearing against the face of the jewel.

A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole. The hole is typically shaped like a torus and is slightly larger than the shaft diameter. The jewel material is usually some form of synthetic corundum, such as ruby. Jewel bearings are used in precision instruments where low friction, long life, and dimensional accuracy are important, but their largest use is in mechanical watches.

单词	Jewel bearing
释义	Jewel bearing 英语百科 Jewel bearing A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole. The hole is typically shaped like a torus and is slightly larger than the shaft diameter. The jewel material is usually some form of synthetic corundum, such as ruby. Jewel bearings are used in precision instruments where low friction, long life, and dimensional accuracy are important, but their largest use is in mechanical watches.
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