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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 jewels are typically made from the mineral corundum , usually either synthetic sapphire or synthetic ruby .
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Namiki Precision Jewel Co., Ltd. (並木精密宝石株式会社, Namiki Seimitu Houseki Kabushiki-gaisha) is a Japanese component manufacturing company based in Tokyo, Japan. The company was founded in 1939 as a manufacturer of synthetic sapphire jewel bearings for electrical measuring instruments.
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The lower jewel is called the 'hole jewel', the upper one is the 'capstone' or 'end jewel'. This type of bearing is used in watches where friction is critical, such as in the balance wheel pivots. With ordinary bearings (shown in Watch jewel bearing.svg ), when the watch is vertical the shoulder of the shaft bears against the face of the hole ...
The company was founded in 1939 as Namiki Seisakusho to make jewel bearings for electric meters. In 1953, the company was reorganized as Namiki Precision Jewel Co., Ltd. In 1957, Adamant Shoji Co., Ltd., was spun off from Namiki Precision Jewel Co., Ltd., in order to segregate sales by source.
Jewel, a Dalmatian puppy with spots forming a necklace in 101 Dalmatians; Jewel, one of the main characters in the animated film Rio and its sequel Rio 2; Jessica Jones, a superheroine in the Marvel Universe who uses the alias Jewel; Jewel the Beetle, a character from the IDW Publishing comic series Sonic the Hedgehog
This page was last edited on 3 December 2023, at 10:35 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.