Nearly crashed my denford triac machine and not sure what went wrong, help please?

[JAZZCNC]

Ok well nothing looks wrong or excessively over tuned here. Thou I'm not a fan of micro stepping at 1000ms (1000/5mm pitch=200 steps per) as I find for some strange reason this setting can give more resonance which can affect motors than 800 or 1600. That said I'm pretty sure this won't be your problem.

What your problem is I'm not sure and without being at the machine it's difficult to diagnose.

First port of call is checking all mechanical coupler connections or pulleys etc connecting to motors and ballscrews.
Then check the machine returns exactly back to X0 Y0 in work coordinates. (Not Home position) Make a Ref mark or set a DTI before starting code and check it comes back to same mark when sent to G0 X0 Y0 using MDI or Goto Zero.

If it doesn't then your loosing steps for what ever reason. I was trying to take note when watching the video because at first I thought it was stepping over slightly when returning to start of each step down but the camera is shaky so hard to see. Looking again a few times I don't think it is. Plus if it is it's certainly not enough to cause that amount of steppover you had.

If it does return exactly to Ref mark then I'm afraid it may remain a mystery until it either repeats it again or you realise it was something you did by accident.!!
Possibly could be electrical noise affecting the Machine but again with so much error I don't think so.!

Sorry can't suggest anything else it could be.!