The clamp provides pressure from several directions on the edges of the board. If the square-threaded screw

Question:

The clamp provides pressure from several directions on the edges of the board. If the square-threaded screw has a lead h, radius r, and the coefficient of static friction is μs, determine the horizontal force developed on the board at A and the vertical forces developed at B and C if a torque M is applied to the handle to tighten it further. The blocks at B and C are pin-connected to the board.

Given:

h = 3 mm

r = 10 mm

μ s = 0.4

M = 1.5 N ∙ m

β = 45 deg