Screw

Simple Mechanisms

F = force at end of handle or wrench; R = lever-arm of F;
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:

 

 

 

 

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