need help with calculating the mechanical drive

[jord]

I am working on my rebuilt cnc mill, how can i calculate the setting for motor tuning.

the stepper motor has a gear 18:30 I don't know the thread of the spindle on the X axis.
We did some test runs and came on a figure of 1375 for 75mm I can't explane this outcome I missing 0.10mm with this out come

Is there anyone how can help me to get things done?

Gr. Jord 

[Hood]

You could use the SetSteps per Unit button on the settings page (just above the reset button). Personally I prefer calculating the numbers but as long as your measurements are accurate when using the Set Steps per Unit button then you should be close.
Hood

[jord]

one moment i am looking for it.
thank for your quick response

gr. jord

[jord]

one moment i am looking for it.
thank for your quick response

gr. jord

[Hood]

See the scrrenshot below for the buttons location.
Hood

[jord]

thanks this will work I think, I will let you know if it's ready.
Going to bed it's 01:20 in the morning.
see you soon.

jord