View Calculator. T a T a = Torque to accelerate (ft.lbs.) W K2 W K 2 = Rotational inertia of object (lbs. f f t. 2) (for solid screw shaft, use W K2 W K 2 = 1/8 W D2 W D 2. where W = weight of screw (lbs.) D = diameter of screw (ft.)) ΔRP M Δ R P M = Change in rotational speed (rpm)
