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2. Jewel bearing - Wikipedia

   en.wikipedia.org/wiki/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 jewels are typically made from the mineral corundum , usually either synthetic sapphire or synthetic ruby .

3. Incabloc shock protection system - Wikipedia

   en.wikipedia.org/wiki/Incabloc_shock_protection...

   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.

4. Namiki Precision Jewel Co - Wikipedia

   en.wikipedia.org/wiki/Namiki_Precision_Jewel_Co

   The company was founded in 1939 as a manufacturer of synthetic sapphire jewel bearings for electrical measuring instruments. Namiki supplies industrial jewel parts, dc coreless and dc brushless motors , multi-functional vibration components, precision gearheads, medical equipment , watch exterior parts, Analog Record-related Products and other ...

5. Tourbillon - Wikipedia

   en.wikipedia.org/wiki/Tourbillon

   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 ...

6. File:Watch jewel bearing and capstone.svg - Wikipedia

   en.wikipedia.org/wiki/File:Watch_jewel_bearing...

   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 ...

7. File:Watch jewel bearing.svg - Wikipedia

   en.wikipedia.org/wiki/File:Watch_jewel_bearing.svg

   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 ...

8. Jewel - Wikipedia

   en.wikipedia.org/wiki/Jewel

   Jewel Tower, a tower of the Palace of Westminster, in London, England; Fraternal jewels, the medals worn in both secular and religious fraternal organisations; Jewel beetles, the family Buprestidae; Jewel butterflies, various Lycaenidae; Jewel damselflies, the family Chlorocyphidae; Jewel bearing, a jewel-lined bearing commonly used in ...

9. Automatic watch - Wikipedia

   en.wikipedia.org/wiki/Automatic_watch

   To wind a watch effectively, one of the chief requirements of a rotor is heft. Until this point, the best bearing used in any watch was a jewel bearing, which perfectly suits the small gears of a watch. A rotor, on the other hand, requires a different solution. In 1948, Eterna introduced the solution that is still in use today: ball bearings ...