Numerical - Torque to overcome thread friction, given load, friction & lead angle

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 7o and 9o respectively
- Published on 14 Sep 15

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

ANSWER: 34.40 N-m

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    Discussion

  • Sravanthi   -Posted on 04 Nov 15
    Given: Axial load = 8 kN, Dm = 30 mm, λ = 9° , Φ = 7°

    Formula: Torque required to overcome thread friction (T) = (Wdm / 2) x tan ( Φ + λ)

    Solution:

    Substituting the given values we get,

    (T) = (Wdm / 2) x tan ( Φ + λ)

    = (8 x 103 x 30 / 2) x tan (7 + 9)

    = 34409.44 N-mm

    = 34.40 N-m

    Torque required to overcome thread friction is 34.40 N-m

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