1 A single squarethread power screw has an input power of 3 kW at a speed of 1 revs The screw has a diameter of 40 mm and a pitch of 8 mm The frictional coefficients are 014 for the threads and 009 for the collar with a collar friction radius of 50 mm Find the axial resisting load F and the combined efficiency of the screw and collar 2 For the C clamp shown a force is applied at the end of the 3 8 in diameter handle The screw is a 3 4 in6 Acme thread and is 10 in long overall with a maximum of 8 in possible in the clamping region The handle and screw are both made from colddrawn AISI 1006 steel The coefficients of friction for the screw and the collar are 015 The collar which in this case is the anvil strikers swivel joint has a friction diameter of 1 in It is desired that the handle will yield before the screw will fail Check this by the following steps a Determine the maximum force that can be applied to the end of the handle to reach the point of yielding of the handle b Using the force from part a determine the clamping force c Using the force from part a determine the factor of safety for yielding at the interface of the screw body and the base of the first engaged thread assuming the first thread carries 38 percent of the total clamping force d Determine a factor of safety for buckling of the screw