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Ring Jewel Bearing Ruby Sapphire Ring Jewel Bearing

Ring Jewel Bearing is a miniature type of ring or journal bearings. Typical materials are synthetic sapphire and ruby with a friction of 0.15 or less (sliding friction with steel).

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Description

Ring Jewel Bearing
Ring Jewel Bearing is a miniature type of ring or journal bearings. Typical materials are synthetic sapphire and ruby with a friction of 0.15 or less (sliding friction with steel). Ring jewels are served as a journal or annular bearings normally used with straight cylindrical shafts. Ring jewels contain a contoured hole shaped like an hourglass or an olive. The olive hole offers a reduced contact area with pivots that lead to lower friction and permit assembly adjustment so as to compensate for any misalignment.

Ring Jewel manufacturers as per customer's specification from the Ruby and sapphire material

As radial/sleeve gemstone bearings, Ring Jewel Bearing is used with straight cylindrical shafts. The Bearing on the ring has many combinations with gemstones, so they are flexible. Straight holes limit lateral movement, but precise alignment is required when the gap between the pivot and the gem bearing is tight. The olive hole provides low friction with the pivot and allows assembly adjustment. It provides minimal contact with the pivot to achieve light, intermittent end thrust. In the case of continuous thrust load, the end stone is usually combined with the ring gem.

WDQ OPTICS offers a wide variety of ring gem bearings, which are widely used in precision instruments. Main applications: gauges, dial indicators, timing mechanisms, aircraft instruments, electrical insulators, gas and liquid flow control, gyroscopes, and other measurement and control devices.

Material: Synthetic sapphire/ruby single-crystal α-Al2O3, natural agate, crystallite glass and ceramic, etc.

MAIN MADE CORUNDUM PROPERTY
General	Chemical Formula	Al2O3
	Crystal System	Trigonal
	Class	Hexagonal-scalenohedral
	Melting Temperature	2030°c
Thermal	Thermal Expansion	Parallel to C-axis: 6.7× 10-6

		Perpendicular to C-axis: 5.0×10-6
	Specific Heat	0.18 Cal/gmoK（25℃）
Mechanical	Density	3.98 ~ 4.1g/cm3
	Hardness	9Moh’s Scale
		（Hv）≥1700kg/mm2
	Modulus Of Elasticity	340-380Gpa
	Compressive Strength	2.1Gpa
	Tensile Strength	0.19Gpa
Optical	Index of Refraction	Parallel to C-axis:1.769

		Perpendicular to C-axis:1.76
	Index of IR Transmission	85%
Electrical	Electrical Resistance	1016 Ω/cm(25°c)
	Dielectric Constant	7.5-10
Chemical	Corrosion Resistance	Can not be corroded by acid or alkali at normal temperature, only can be corroded by HF at 300°c

Those parts are manufactured according to the customer’s design and specifications, synthetic sapphire blank, cup bearing, stick, balls, windows, and other special parts according to the customer's drawings or request.

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