A single-threaded power screw of square form is to raise a load of 90KN at the rate of 360mm/min. Other data are as follows: Nominal Diameter of screw = 36mm Pitch = 6mm Coefficient of thread friction = 0.1 Coefficient of collar friction = 0.08 Friction radius at collar= 30mm Determine the power input to the screw in kilowatts

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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.