I agree with sschneider. That was one of the nicest things about setting up this unit (Using WinCNC I had to measure the move and guess how much to increment/decrement the setting). Go to the 'Setting's page, click on 'Set Steps per Unit' in the lower left corner, and let it do the math. I used a 6" dial caliper. I opened it to 5" and placed the tail against the moving axis, then told it to move 1" toward the calipers (later I did it at 4" to fine tune it). It will ask you how far it actually moved. Read the caliper, then enter the actual movement. When you enter that number it will calculate the steps required. Save the results and the next move is very close. The longer move you can make, the closer it will be.