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The internal structure of an elastomeric bearing consists of a three layers: a lower "pot" made of steel, which rests on the foundation or footing; a relatively thin elastomeric pad (a rectangle or disk shape) resting on the lower pot; and a steel plate loosely set on top of the elastomeric disk, on top of which the weight of the bridge rests.
A baler or hay baler is a piece of farm machinery used to compress a cut and raked crop (such as hay, cotton, flax straw, salt marsh hay, or silage) into compact bales that are easy to handle, transport, and store. Often, bales are configured to dry and preserve some intrinsic (e.g. the nutritional) value of the plants bundled.
Baling twine or baler twine is a small diameter sisal or synthetic twine used to bind a quantity of fibrous material (notably hay or straw) into a more compact and easily-stacked form. [citation needed] Tensile strengths of single-ply baling twine range from 95 psi (0.66 MPa) to 325 psi (2.24 MPa). [1] [2]
Balers are usually pulled by a tractor, with larger balers requiring more powerful tractors. Mobile balers, machines that gather and bale hay in one process were first developed around 1940. The initial balers produced rectangular bales that were small enough for an individual to lift, typically weighing between 70 and 100 pounds (32 to 45 kg ...
Thrust ball bearings, composed of bearing balls supported in a ring, can be used in low-thrust applications where there is little axial load. Cylindrical roller thrust bearings consist of small cylindrical rollers arranged flat with their axes pointing to the axis of the bearing. They give very good carrying capacity and are cheap, but tend to ...
The bearing has sectional shoes, or pads on pivots. When the bearing is in operation, the rotating part of the bearing carries fresh oil in to the pad area through viscous drag. Fluid pressure causes the pad to tilt slightly, creating a narrow constriction between the shoe and the other bearing surface.