A Machine vice has single start square threads with nominal diameter 22 mm and pitch 5 mm. Collar diameters are 55mm and 45mm respectively. Coefficient of friction for threads 0.15 and u for collar 0.17 The machinist can comfortably apply a force of 125N on handle of mean radius 150 mm. Assuming uniform wear theory calculate, (1) The clamping force developed between the jaws, (2) The overall efficiency of screw

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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.