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Linear bearing is a kind of linear motion system of low cost in yielding, used for infinite journey by combination with cylindrical shaft. The allowable load will be small, thanks to the point-contact between bearing sphere and shaft. The steel ball turning with least frictional resistance, a high-precision smooth motion could accordingly be obtained. The linear bearings have been broadly used in computators and excircle equipments, automatic recording instrument and precision equipments like digital 3D measurements, as well as sliding parts in industrial machinery, as multiple spindle drill, punching machine, tool-grinding machine, automatic cutting machine, printer, card separator, wrap machine, etc. .