Hi Guys, first post here :)

I recently bought an Ebay 3040 CNC mill, Mach3 and Vcarve Pro for an upcoming project (producing model railway track bases).

I've done setting up mach3 with the recommended mach3 settings of the manufacture here:

My problem is that when mach3 says the axis has moved say 20mm, it has actually moved more like 30-35mm.

Does anyone know why this might be?

The recommending settings for both x & y axis are 400 'steps per' in mach3 motor tuning, but I could only get it working correctly if I lowered this to around the 320 mark.

Also, it recommends velocity as 2000 for x & y, when I enter this and click 'save axis settings', it changes to 1999.98 or something.

I work in MM's in all cad and have mach3 set to MM's.

If anyone has any ideas, I would appreciate the help.

Thanks,
Wayne.