Design of Machine Elements
Q. Determine torque required to overcome collar friction in square threaded screw, if coefficient of friction is 0.12 and axial force of 20 kN is exerted by the screw. Mean radius of friction collar is 20 mm
a. 48000 N-mm
b. 120 N-mm
c. 4800 N-mm
d. 12000 N-mm
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