Design of Machine Elements

Q.  Calculate torque required to overcome thread friction if axial load of 8 kN acts on a power screw having double start square threads of 30 mm mean diameter. Friction angle and lead angle are 7° and 9° respectively

a. 68.81 N-m
b. 41.90 N-m
c. 34.40 N-m
d. Insufficient data


ANSWER: See Answer
 
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