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Often the slew axis is combined with another axis to form a motion profile. In crane terminology, slewing is the angular movement of a crane boom or crane jib in a horizontal plane. The term is also used in the computer game Microsoft Flight Simulator wherein the user presses a key and he or she can rotate and move the virtual aircraft along ...
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.
Slewing cranes which allowed a rotation of the load and were thus particularly suited for dockside work appeared as early as 1340. [30] While ashlar blocks were directly lifted by sling, lewis or devil's clamp (German Teufelskralle), other objects were placed before in containers like pallets, baskets, wooden boxes or barrels. [31]
In 1932 the double jib system for slewing cranes was invented and patented. [2] The special feature of this jib system is that the hook remains at a constant height when the direction is changed. Until the present day, these cranes (also called gantry luffing and slewing cranes) are the key products in the company's product range.
A ring crane is a form of large construction crane with a luffing jib. It is distinguished by its slew pivot [ i ] being in the form of a ring-shaped track, rather than a narrow central spindle. The broad base this gives to the slewing section above allows it to slew whilst carrying extremely heavy loads.
The jib has a radius (reach) of 35 feet (11 m) and a height of 40 feet (12 m). The crane weighs 120 tons. A vertical boiler inside the cab operates at 100 psi and supplies two twin-cylinder steam engines: one for slewing (turning) the crane, a larger one for winding the lifting chain. The winding drums can be driven by their gearing at four ...
The crane was erected in 1903 at a cost of £3,352 by German firm Kohncke. [5] The yard was short-lived, lasting from 1899-1930, but saw significant use during the First World War when it built a number of ships for the Royal Navy. [7] The Beardmore Crane was demolished c. 1971. [8] [9]
Rather than slewing (rotating) the crane to reach the delivery hopper on-shore, a kangaroo crane has its own in-built hopper beneath the jib, that slews with it as the crane rotates. Dumping the grab contents into the hopper now only requires the quicker luffing movement, without needing to slew for each load.
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related to: slewing crane- 1531 Alum Industrial Drive, Columbus, Ohio · Directions · (800) 878-7305
