1. The problem statement, all variables and given/known data I am trying to experimentally measure the torque of a stepper motor at various velocities. I'm not quite sure how this should be done. Here is a diagram of my proposed method so far: Basically a weight is to be suspended from the motor by a string, and I will measure by how much the string has moved up after one full revolution. Then I believe the torque must be: ##\tau = m \times g \times \Delta L##. Is this a correct method? 2. Relevant equations Torque = Force x Distance 3. The attempt at a solution I would greatly appreciate it if someone could confirm whether this is a correct method to get a roughly correct measurement of torque (within perhaps ~80% of the manufacturer quotedvalue at a given velocity)? Do I need to take the shaft diameter into account (or perhaps some other factors)? What is the simplest way of doing this?