Hello, i am goin in on Dec 5 to write the millwright C of Q for the 3rd time. On the test there was a question that went something like this The crane is rated 40Ton, with a boom lenght of 40ft and at an angle of 70 deg. The jib is 8ft long on a 10 deg angle. What is the sefe working load. The numbers are not correct but that is how the question is phrased. Please help me with the formula. I cannot find it anywhere.
Safe Working Load Formula
Normally you would get a chart for that crane and you look up the SWL at the extension and angle you would want to use, but you can calculate this too. Basic formula; mass*distance = newmass*newdistance, in the case you have described you have to take into account that the distance is not the load arm as it is not at a right angle to the force the mass has and therefore you would have to work that out via trigonometry. Any clearer?
