Problem with tuning motors

[Starleper1]

I am setting up my machine using Mach (obviously) Whats happening is that when i calculate the steps per, it gets me close. Then i use the steps per function on the setup page, where it asked you how far to move and then how far it actually moved. It adjust to the proper steps per. It then moves the distance it says. Now, when i jog in step mode, set at say .100, it will only move like .088-.090. Backlash isn't an issue either. Anyone run into this at all?

[tigran]

Originally Posted by Starleper1 It then moves the distance it says. Now, when i jog in step mode, set at say .100, it will only move like .088-.090. Backlash isn't an issue either. Anyone run into this at all?

If the machine moves to 88-90 at your command 100, it means your'e close to the right value of steps per. Try to change steps per value and measure the real move...
In mach3 help.pdf there's a formula, that connects the step of your motor with the step of the the moving spiral... try to read there...