The figure you are using is steps per revolution, what you need to make allowance for is the pitch of your leadscrew. If it is 1mm then each revolution will advance the axis 1mm so the steps per mm is 200, if the pitch is 2mm then each revolution will advance the axis 2mm the steps per mm is 100, and so on. You also need to allow for any gearing you have between steppers and leadscrew. Once you have translated steps per revolution into steps per mm you can then fine tune as per the oter replies.
Chris |