Ring Stones: - Are normally used in applications where a shaft or rotating member is cylindrical and requires the use of an annular bearing. They are also used when it is necessary to have the pivot or shaft extend through the bearing to support some portion of the instrument outboard of the bearing. The internal edges of the ring may be elliptical (olive shaped) so as to compensate for any misalignment.
Because of their dimensional close tolerance and natural properties they are also often used as precision orifices.
Typical applications: - Watches, Gauges, Indicators, Aircraft instrumentation, Electrical insulators in microwave devices, Gas and liquid flow control, Gyroscopes, and many other measuring and controlling devices.
All dimensions in millimetres
Many other sizes available upon request
End Stones: - Are generally used as a thrust bearing in conjunction with ring stones. They are also used independently as wear plates where the advantages of its sapphire properties meet the demands of a particular application. In many applications, domed pivots are used with flat end stones to decrease the area of contact in order to reduce the friction.
Typical applications: - Thrust bearings, Electrical insulation pads, Wear plates, Water meters, Spacers.
RING STONES & END STONES
Ring stones and end stones offer great design flexibility because of the various combinations possible. Correct choice of design and lubrication ensures a low-friction movement.
Among the many configurations offered are the ultra-close-tolerance hole jewels for use where extreme accuracy is desired, olive hole jewels which allow a degree of shaft misalignment and offer minimum contact with the shaft. Other ring stone shapes are available i.e. bombe, cupped and double cupped (details available upon request). So many combinations can accomplish almost any design objective.
Ring stones and end stones are used an a variety of instruments, including gauges, indicators, aircraft instruments, electrical measuring instruments, watches, clocks, potentiometers, gyroscopes, and many other types of controlling devices.
They are normally used in applications where the shaft or rotating member is cylindrical, requiring the use of an annular bearing. They are also used when it is necessary to have the pivot or shaft extend through the bearing to support some portion of the instrument outboard of the bearing. In addition, they are used as electrical insulators in microwave devices and similar equipment. They can be used to control the flow of fluid or gas, as in typical orifice application, and larger-sized ring jewels may substitute for ball bearings in other applications. The wide variety of shapes mounting arrangements makes the potential uses of ring jewels extensive.
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