(Solved):   Ques.3: The single threaded screw of the vise (Figure: 3) has a mean diameter of \( 25 \ma ...

 

Ques.3: The single threaded screw of the vise (Figure: 3) has a mean diameter of \( 25 \mathrm{~mm} \) and a lead (advancement per turn) of \( 5 \mathrm{~mm} \). the coefficient of static friction in the threads is \( 0.20 \). A \( 300 \mathrm{~N} \) pull applied normal to the handle at \( \mathrm{A} \) produces a clamping force of \( 5 \mathrm{kN} \) between the jaws of vise. Determine the: a. Frictional moment \( M_{B} \), developed at \( B \), due to the thrust of the screw against the body of the jaw. b. Force \( Q \) applied normal to the handle at A required to loosen the vise. rigure: \( s \) Figure: 4