The Dreaded X axis stepper error using UC400ETH and UCCNC !!!

[dachopper]

The stepper ground is temporary as I was still trying to troubleshoot

[Clive S]

The stepper ground is temporary as I was still trying to troubleshoot

Ok It is always better to use twisted pairs for the step and dir wire from the drives to the control board just chop a cat5 cable up.

[dachopper]

10mm x axis skip. I've now moved the vfd braid shield onto a separate ground than the stepper shielding.

If it happens again, I'll move the spindle motor shield onto th

[dachopper]

Guess what.... all skips happening on parallel moves..... ! Strange

[Clive S]

Guess what.... all skips happening on parallel moves..... ! Strange

I you sure that this is not binding up or overtuned

[dachopper]

I am positive it is not mechanical, if I leave spindle turned off, it does not skip. If I turn spindle on and run job in the air, it jams under no load, and if I try to force it to jam, I can't, so it's 100% electronic interfere

[Clive S]

Guess what.... all skips happening on parallel moves..... ! Strange

what do you mean by this

[dachopper]

It;s the type of Cut the machine is doing when the skipping happens. Its a a sideways X movement with vertical Z at the same time, repeat x 1000

Doesn't seem to skip doing a normal constant Z level manoeuvre....

Now I must be 3.5 hours into this next cut, so far no issues.

[m_c]

Given the 'zapping' I would be checking you do have a good earth. The normal easy test is one of those plugin testers with LEDs on, but given you're down under, I'm not sure what would be available. It's also worth running the machine at the same time as having the tester plugged into the next nearest socket, just to make sure a good earth remains with things under load.

If you don't have a good earth, then the various filtering capacitors typically found in mains connected electronics (VFDs especially), can cause a voltage build up, which will earth through the nearest thing, which can be the person in contact.
You may need to install a new earth rod, or figure out why you've got a poor earth.
(does Australian power use L,N+E, or a centre tap L,L,N/E? to get 110V and 220V?)