Well I though I was all set up and ready for my first test program but have discovered an issue.
As soon as I send power from the vfd to the spindle the y axis stepper motor begins to turn in a jerky way.
This is strange as the vfd is a seperate unit and isn't connected to the motor controller box in any way.
I've seperated the wiring for the y motor but it's still doing it.
Does this sound like a shielding issue?

It's this version of the 6040

https://www.ebay.co.uk/itm/3-Axis-60...item3f770dc5f7

Rich