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I was searching the net for information on gear (lead screws, worm gear) efficiency matematical modeling. I need it for the evaluation of a closed loop algorithm, using simulink. It wasn't difficult to write the dynamic equation of a lead screw, input torque, and the movment of the nut. The problem strats when a linear, one direction, disturbance force acts on the nut. Then if u want to define all the forcess acting on the motor,the subject of direct and indirect efficiency of the lead screw arises. Have u any information I can use on the above? thanks, roni