http://www.usa.canon.com/cusa/semiconductor/products/encoder_optolectronic_components/air_bearing/air_bearing?pageKeyCode=writeReviewPage
Air Bearing
Features
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The use of carbon-type porous materials prevents burning and catastrophic failures due to air during rotation.
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Even with an increased load capacity, high precision is maintained.
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The highest rotation precision-best in the industry-is attained both in the radial and axial directions.
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Because of the little air consumption, the air compressor could be made compact.