Question: In a bench vice as shown in Fig. 3 , the screw has a single start square thread and the outer and inner diameter of

In a bench vice as shown in Fig. 3, the screw has a single start
square thread and the outer and inner diameter of the friction
collar are 16 mm and 46 mm respectively. Design a screw if a
mechanic exerts 300 N effort at the end of a handle of radius 180
mm & also calculate efficiency of the bench vice?
In a bench vice as shown in Fig. 3 , the screw

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