Information about the clamp assembly in the figure is given below. Thread diameter 12 mm, root diameter 10.16 mm, pitch 1.5 mm, screw profile angle 2α=60, friction surface of table A diameter 10 mm, friction between plate A-screw end surface coefficient 0.15 and screw-nut friction coefficient 0.15 is given. If a hand force of 200N is applied to the vise arm, if applied, a) How much force is applied to the clamped part. b) Calculate the efficiency of the vise.

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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.