I'm having trouble with my 135 with differences in the X and Y axis.

For example, if I try to mill a 1" circle the X axis dimension is correct but the Y axis dimension is -0.020" less. I've written a simple program to cut parallel slots, measured their dimensions and found the same problem, ~0.020" per inch incorrect in the Y direction but the X axis dimensions are correct. I looked at the G code and the data is correct but for some reason the machined Y distances are incorrect.

I had a similar problem on another piece of equipment and I was able to adjust the number of pulses/inch the drive motors were given but I don't know if I can do that with this unit. I'm running Mach3 software.

Any help would be appreciated.

Tom