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| View Original: | Watch jewel bearing.svg (640x420) | |||
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| Keywords: Watch jewel bearing.svg Drawing of jewel bearing used in a mechanical watch The donut-shaped bearing is shown sectioned through its axis This type is called a 'hole jewel' used for most of the ordinary wheels in the gear train The bearing red is usually made of synthetic sapphire ruby It is press-fitted into a hole in the movement's supporting plate grey The cup-shaped depression in the top of the jewel is the oil cup; it's purpose is to hold the lubricating oil yellow in contact with the bearing shaft by capillary action In wheels where friction is critical a 'capstone' shown in Image Watch jewel bearing and capstone svg is added on the end to prevent the shoulder of the shaft from bearing against the face of the jewel Information for this drawing came from Henry B Fried 1954 Bench Practices for Watch and Clockmaker Arlington Book Co Virginia USA Book 3 Ch 1 p 140-188 Own work by uploader using Inkscape 2008-07-13 Chris Burks Chetvorno I Chris Burks the author release this work into the public domain for any use whatever Clockworks Watchworks Cross sections of bearings Ruby SVG machinery | ||||
