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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.
Rolling bearings; single row radial contact ball bearings: Active: DIN 625-3: Rolling bearings; double row radial contact ball bearings: Active: DIN 625-4: Rolling bearings; radial contact groove ball bearings with flanged outer ring: Active: DIN 653: Knurled thumb screws, low type: Active: DIN 678-1: Envelopes – Part 1: Sizes: Active: DIN 678-2
The functional relationship between the drive belt, sub-platter, and motor pulley, can be seen through the glass platter on a Rega Planar 3.. There are three main types of phonograph turntable drives being manufactured today: the belt-drive, idler-wheel and direct-drive systems; the names are based upon the type of coupling used between the platter of the turntable and the motor.
The small size (one-tenth the size of old bearing designs), low friction and long life of Kingsbury and Michell's invention made possible the development of more powerful engines and propellers. They were used extensively in ships built during World War I , and have become the standard bearing used on turbine shafts in ships and power plants ...
The Sondek LP12 turntable, introduced in 1972, uses a suspended sub-chassis design and a patented tightly toleranced single-point bearing.The LP12 has evolved since its introduction, but its basic suspended sub-chassis design has remained. [5]
A turntable for the Central Railroad of New Jersey. Turnplates at the Park Lane goods station of the Liverpool and Manchester Railway in 1831. Early wagonways were industrial railways for transporting goods—initially bulky and heavy items, particularly mined stone, ores and coal—from one point to another, most often to a dockside to be loaded onto ships. [4]
To reduce friction, grease is applied to the surface of the fifth wheel. The configuration is sometimes called a turn-table in Australia and New Zealand, especially if it is a rotating ball-race-bearing type. The advantage of this type of coupling is towing stability.
Very inexpensive turntables sometimes used ball bearings, which are very likely to generate audible amounts of rumble. More expensive turntables tend to use massive sleeve bearings, which are much less likely to generate offensive amounts of rumble. Increased turntable mass also tends to lead to reduced rumble. A good turntable should have ...
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