مشروع البحث: Improvements in mechanical crane drum desingn
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المساهمين
الممولين
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6005
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الوصف
The simplest Roman crane consisted of a single-beam jib, a winch, a rope and a block containing three pulleys. Having thus a mechanical advantage of 3:1, it has been calculated that a single man working with the winch could raise 150 kg (3 pulleys x 50 kg = 150 kg), assuming that 50 kg represents the maximum effort a man can exert over a longer time period.
Today crane parts are made of different types of metals, heavy-duty cables, and can lift and move objects many times heavier than the loads of ancient times. In olden
times, thousands of slaves had to be arranged whenever a heavy load had to be lifted or dragged Khurmi, (2009). Moving these objects involves some interesting physics. The load is attached to the end of the cable, and then cranked along pulleys to whatever height necessary. The most fun lies in the smallest piece, the pulley
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mechanical crane drum desingn