Jewel bearing

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Ruby jewel bearings used for a balance wheel in a mechanical watch movement.

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 sapphire, such as ruby. Jewel bearings are used in precision instruments, but their largest use is in mechanical watches.

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Paul Baillio, "Jewel Bearings Solve Light Load Pro... Paul Baillio, "Jewel Bearings Solve Light Load Problems" www.birdprecision.com/PDFs/jewelbearings.pdf - Web

A. C. Lawson, "Design Factors for Jewel Bearing Sy... A. C. Lawson, "Design Factors for Jewel Bearing Systems" www.birdprecision.com/PDFs/design_factors.pdf - Web

R. H. Warring, "Calculating Frictional Losses in J... R. H. Warring, "Calculating Frictional Losses in Jewel Bearing Movements" www.birdprecision.com/PDFs/frictional_losses.pdf - Web

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American Watchmakers-Clockmakers Institute American Watchmakers-Clockmakers Institute www.awi-net.org - Web

TimeZone.com discussion of watch jeweling TimeZone.com discussion of watch jeweling www.timezone.com/library/workbench/workbench0025/ - Web

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