Hello All!
My name is Alex,
I have start work with new China CNC machine,
I installed the program MACH3 and configured lik it was write in manual instruction.
But it dos't work correct. 
For example i want to did pockets diameters  10mm, 15mm, 20mm.
But i received 9.92mm, 14.92mm and 19.92mm.
i using SolidWorks CAM, Fusion 360, or  ColidCam 2013
How i can fix it?
In settings calibrate  with " Set Steps per Unit " ?
Thank you for Help!