I have a question regarding inertia and friction between gears. I have a gear which is connected to the rod at one end and an electric motor which is connected to the other end. I know the torque of the rod and I want to calculate the torque of the motor I need. I have been told that I can't lay on transmission ration only and I also have to include the calculations of the inertia and friction between gears.
Can please someone explain me how should I do it (every example will appreciated).