Quote Originally Posted by JAZZCNC View Post
Again another obvious suggestion but got to be said to eliminate. Not got loose Pulley.?



Yes Input line Filters.

Did you Earth the Frame.?

Re: Separate ground rod then I'd say not because want to use the same ground that mains supply does so don't introduce ground loops. However I'm not expert on this and don't know the differences between American and UK electrics other than frequency.
I appreciate all of the "obvious" questions as it is easy to overlook items when troubleshooting... Yes confirmed no loose pulleys, I also have been watching the actual belts on the servos on X (hard to watch both of course) but it looks like the master is moving before the slave. I plan to swap cables to those motors and then swap drives and find where the issue follows. I can then hopefully pinpoint, cables, drive, motor being the culprit. (or still noise)

Frame grounded and I have a ground going to the gantry and to the Z axis to make sure each part is grounded in the frame.

So the separate ground would need to be bonded back to the ground ref in our house (as I believe this is code). My thinking here would be that this ground rod would give a much shorter path to earth for the Hf noise. Not sure it would make a difference or not just something I was thinking of trying.

One question I have is about running cables in the same drag chain, I had assumed that having good shielded cables that I could run all of the cables together in the same chain. Is this a No/No?

I have been looking into line filters to try to get some ordered for the servo drives and the VFD for the spindle.