The arced lines extending from each of these measurements show the position of the boom at various lift angles. The measurements going up the right side of the chart note the boom length (in feet) at various levels of extension. How to Read a Crane’s Working Range Diagram. If you have a jib crane with an 8-foot (2.4 meter) boom and the manufacturer allows L/150, your measured maximum deflection at 100% of the crane’s rated capacity should be approximately 0.64 inches (16 mm) according to the formula /15=0.64 (2,400/150=16).Ĭapable of reaching a maximum working radius of 40 meters. This formula can be used with any unit of measurement. How do you calculate jib crane deflection?
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