Calculate torque and effort force acting on the lever arm.
Note the difference between mass and weight!
For motion in the same direction as the load (load assist the screw jack), the effort force can expressed as
F = Q ( (2 π μ r - p) / (2 π r + μ p) ) (r / R) (2)
r = pitch radius of screw (in)
μ = friction coefficient
For motion in the opposite direction as the load (load resists the screw jack), the effort force can expressed as
F = Q ( (2 π μ r + p) / (2 π r - μ p) ) (r / R) (3)
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