Hi Hood. My steps per unit are very low on X and Y due to my setup. The Z axis is ballscrew whereas the X and Y are belt 1:1. They were correct and ok before but now something has shifted and I cant help but think my software is corrupted. For some reason, I am able to calibrate the steps per unit in mm with the native settings in inches. If I use inches when I calibrate my axis, it just wont come right. So, it is in inches as native units. When I go to axis calibration, if I ask it to move 100, it will move 100mm. All good. Now when I try to run the program it just moves the X and Y axis a very small amount. I hope I have explained this correctly. I do need to look into the correct settings of the Vel and Accel - for some reason the program is changing these settings without my input? I get this feeling I should reinstall Mach 3? Thoughts Hood? The issue I have here is the fact the machine has started doing this after hours of running perfectly. Regards Boyd