Clearance of a slewing bearing is the motion freedom of the outer ring compared to the inner ring, evaluated in two directions: along the axial direction, defined by the revolution axis of the bearing, and along radial direction, any direction perpendicular to the first one when assembling, the plays of the bearing is determined by matching rings raceways with rollers, each component have its tolerance. The slewing bearing can slow four different types of clearances, both ball and crossed roller bearing. The type choice id done simultaneously to bearing type selection, and mainly depends on the application field.

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