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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 .
English: Drawing of a jewel bearing and capstone in a mechanical watch. The bearing is sectioned through the axis. The jewels (red) are made of synthetic ruby. 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 ...
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.
Jewel bearing of a balance wheel, supported by a lyre-shaped spring. The Incabloc shock protection system is the trade name for a spring-loaded mounting system for the jewel bearings that support the balance wheel in a mechanical watch, to protect the wheel's delicate pivots from damage in the event of physical shock, such as if the watch is dropped.
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 Watch jewel bearing and capstone.svg ) is added on the end to prevent the shoulder of the shaft from bearing ...
Printable version; In other projects ... move to sidebar hide. Wheel bearing may refer to: Ball bearing; Bearing (mechanical) Fluid bearing; Jewel bearing; Journal ...
Started sales of jewel bearings for watches and clocks. 1959 - The Company Changed name to Adamant Kogyo Co., Ltd. 1960 - Began to manufacture jewelled bearings for watches. 1967 - Akita Factory was set up at Yuzawa City, Akita. 1969 - Started manufacturing and sales of component parts for medical equipment.
In the three axis tourbillon movement, the 3rd (external) cage has a unique form which provides the possibility of using jewel bearings everywhere, instead of ball-bearings. This is a unique solution at this size and level of complication. [11] There are a few wrist and pocket watches that include the Triple Axis or Tri-Axial Tourbillon ...