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A lazy Susan in a Chinese restaurant. A lazy Susan is a turntable (rotating tray) placed on a table or countertop to aid in distributing food. Lazy Susans may be made from a variety of materials but are usually glass, wood, or plastic. They are circular and placed in the centre of a table to share dishes easily among diners.
Aerostatic bearings: The gas is externally pressurized (using a compressor or a pressure tank) and injected in the clearance of the bearing. Consequently, aerostatic bearings can sustain loads even in the absence of relative motion but require an external gas compression system, which induces costs in terms of complexity and energy.
Slew ring bearing. A slewing bearing or slew[ing] ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis (yaw) windmill.
Spherical roller bearing with a brass cage in a cut-through view. A spherical roller bearing is a rolling-element bearing that permits rotation with low friction, and permits angular misalignment. Typically these bearings support a rotating shaft in the bore of the inner ring that may be misaligned in respect to the outer ring.
A spherical bearing is a bearing that permits rotation about a central point in two orthogonal directions (usually within a specified angular limit based on the bearing geometry). Typically these bearings support a rotating shaft in the bore of the inner ring that must move not only rotationally, but also at an angle.
The bearing was used mainly in bearing arrangements with very long shafts, such as transmission shafts in textile factories. [6] One drawback of the self-aligning ball bearings is a limited load rating, as the outer raceway has very low osculation (its radius is much larger than the ball radius).
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