A single trapezoidal metric thread power screw is to raise a load of 60 kN. The screw has a mean diameter of 34 mm and a pitch of 5 mm. The coefficient of thread friction and collar friction are 0.15 and 0.11, respectively. The collar mean diameter is 90 mm and the screw turns at 150 rpm. Determine the total torque required to raise the load in N-m.

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Metrology of Screw Threads

Screw threads are a series of ridges having the profile of a helix. This helix profile runs continuously along the length of a uniform solid or a hollow bar of a circular cross-section at periodic intervals. These helix ridges are also formed over a conical bar. These continuous helical ridges are termed threads.