I am trying to calculate the maximum torque a cylindrical body can withstand when clamped by 2 set screws. The cylinder is placed in a housing with a sliding fit against housing surface, and the clamping force produced by the set screws are represented by F1 and F2.
I would like to verify that my below analysis is correct, would appreciate any comments:
For example, if we apply 20Nm torque to the cylinder, the force tangent to the surface of the cylinder is T=FR, 20Nm=F0.05m, F=400N.
Using a formula for estimated force produced from an M4 screw torqued to 1Nm, the force from each set screw is estimated to be ~850N. Assuming the coefficient of static friction between the set screw (steel) and the cylinder (brass) to be 0.5, the friction force from the set screws is 850N as shown above, and the cylinder should not turn.