slewing ring bearing or slewving bearing User Manual
To "slew" means 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 bearings, slewing bearings are thin in section and are often made in diameters of a me...
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