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Engineering
General Engineering
Boom Angle of Crane: Is High Extension Necessary?
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[QUOTE="Baluncore, post: 6412038, member: 447632"] When they began to build booms from composites, rather than the heavy and difficult to work HT steel, all the sections were extended by an internal tensile wire. The boom had no real strength while being extended as the composite tube walls were too light to carry a large moment at part extension. The composite sections must be fully extended for the tube ends (where there are a pair of internal pulleys) to lock, and so become rigid, and able to carry a side force. The telescopic tubes are under compression, the wire is under tension. I believe that steel booms are now designed using the same philosophy, as they must compete with composite booms. So, now all booms are operated fully extended. The boom angle is controlled, and the safe operating envelope managed by a dedicated on-board computer, to prevent the operator from "taking the crane out-of-survey", to put it nicely. [/QUOTE]
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Boom Angle of Crane: Is High Extension Necessary?
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