Air Bearings. For CMMs that will be used in a laboratory or clean room, where there is a minimum of dirt or dust, air bearings are the best choice because they move without friction and are therefore the most accurate. Air bearings are not suitable on CMMs located on the shop floor, because the bearings need constant cleaning and require costly air-activated vibration isolation systems, which slow the measuring speed and decrease the accuracy of the CMM. The isolation systemalso increases the potential for failure because of its complexity and generally fragile design.
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