r = pitch radius of screw;
p = lead of thread;
Q = load.
Then, neglecting friction:
If μ is the coefficient of friction, then:
For motion in direction of load Q which assists it:
For motion opposite load Q which resists it:
Screw
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F = force at end of handle or wrench; R = lever-arm of F; r = pitch radius of screw; p = lead of thread; Q = load.
If μ is the coefficient of friction, then:
For motion opposite load Q which resists it:
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