Granite Surface Tables and Measuring Tools

Rotary Precision Instruments granite surface plates provide an accurate working plane selected from first-choice granite blocks. After cutting, milling and grinding, the surface plates are finish lapped by hand to guarantee a high level of accuracy. RPI supplies a large variety of products to end users and OEM's including fabrications, assembly and inspection equipment. The range of industries include semiconductor, electronic, lithography, optical, vision inspection, coordinate measuring machine, fibre optic, flat panel, laser processing, water jet cutting, defence and many more.

Products include surface plates, straight edges, bases and single components to multi-component assemblies, air bearing rails for precision motion control devices. We can meet your needs for critical geometry into the sub-micron range and provide intricate structural shapes with state-of-the-art computer controlled equipment.

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Physical Properties:

Specific Gravity:	2970 ~ 3070kg/m3
Compressive Strength:	245 ~ 254N/mm2
Elastic Modulus:	1.27 ~ 1.47 x 105N/mm2
Linear Expansion Coefficient:	4.61x10-6/�C
Water absorption:	<0.013%
Shore Hardness:	Hs70