Question: A single-threaded power screw is 25 mm in diameter with a pitch of 5 mm. A vertical load on the screw reaches a maximum of

A single-threaded power screw is 25 mm in diameter with a pitch of 5 mm. A vertical load on the screw reaches a maximum of 7 kN. The coefficients of friction are 0.05 for the collar and 0.05 for the threads. The frictional diameter of the collar is 35 mm. Find the overall efficiency and the torque to raise and lower the load. The overall efficiency is 36 %. The torque to raise the load is 10.97 * kN-mm. The torque to lower the load is kN-mm

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