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Slewing Bearing:- To,"slew" menas to turn without change of place , a "slewing" bearing is a rotational rolling- element bearing that typically supports a heavy but slow -turning or slow-oscillating load , often a horizontal platform such as a conventional crane , a swing yarder , or the wind -facing platform of a horizontal -axis windmill . Compared to other rolling -element bearing . slewing bearing are thin in section and are often made in diameter of a metre or more , the slewing bearings on the Falkrik Wheel are 4 metres diameter and fit over a 3.5 meter axle . slewing bearings resemble oversize aircraft control surface bearings. Slewing bearings often use two rows of rolling elements . They often use three race elements , such as an inner ring and two outer ring " halves" that clamp together axially . Slewing bearings are often made with gear teeth integral with the inner and outer side , used to drive the plateform relative to the base.
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