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For a power screw having square threads with lead angle of 450 and coefficient of friction of 0.15 between screw and nut, the efficiency of the power screw, neglecting collar friction, is given by

For a power screw having square threads with lead angle of 450 and coefficient of friction of 0.15 between screw and nut, the efficiency of the power screw, neglecting collar friction, is given by Correct Answer 74%

ȵ = tanα/tan(α + ɸ) ɸ = angle of friction, α = Helix angle or lead angle tanɸ = 0.15 ɸ = 8.530 ȵ = 74% .

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