A square thread power screw has pitch of 4-mm with double threads. Applicable data are thread and collar coefficient of friction equal to 0.08, collar diameter of 40-mm, and a load of 6.4-kN per screw and mean diameter of 30mm Determine: a. Torques required to rotate the screw with” and “against” the load. b. Overall efficiency.

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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.