A single acme-thread power screw has an input power of 3 kw at a speed of 1 gev/is. The screw has a diameter of 40 mm and a pitch of 8 mm. The frictional coefficients are 0.14 for the threads and 0,09 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 also find the power screw is self locking or not compare it with triple square thread power screw
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