I have a outdoors wooden window blinds and currently I am raising/lowering them manually - by pulling/releasing a rope that's hooked on them using pulley. It's the most basic setup but still I can't understand how the calculation of torque works.
I know the formula is Torque = Length x Force and Force is gravity pull (mass x 9.81 N*kg-1) (+ some friction). But I am not sure what "Length" is in this case. And where in this formula is considered the motor shaft diameter and step size. From what I understand the torque should be bigger when using microsteps.
So, what is the correct formula in this setup to estimate required torque for the step motor to be able to pull the blinds all the way up and back?