Question: Determine the couple forces F that must be applied to the handle of the machinist's vise in order to create a compressive force FA in

Determine the couple forces F that must be applied to the handle of the machinist's vise in order to create a compressive force FA in the block Neglect friction at the bearing A. The guide at B is smooth so that the axial force on the screw is FA. The single square-threaded screw has a mean radius b and a lead c, and the coefficient of static friction is μs.

Given:

a = 125 mm

FA = 400 N

b = 6 mm

c = 8 mm

μ s = 0.27

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