Hi Dave,

Sounds like an interesting issue. To clarify - before starting the engraving the X axis works as expected, moving at full speed over the entire range of travel?

Is the narrowing a gradual and progressive change or does it suddenly become, say, half the width?

Have you tried an old file that you know works?

Would you be able to share some photos of the machine and the wiring (especially inside the control cabinet) which will help as background info.

Cheers,
Andy