First Build 5 x 12 Steel Frame CNC router

[JAZZCNC]

It is more of a delay to start, i.e. the master motor starts moving and the slave starts up just slightly after (which racks the gantry). When it comes to a stop the master stop slightly before the slave bringing it back into square.

Again another obvious suggestion but got to be said to eliminate. Not got loose Pulley.?

When you say line filters on the VFD's you are talking input line filters correct?

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.

[Scott Damman]

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.

[JAZZCNC]

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.

Not good idea unless you know they are isolated. It's little things like this that can easily introduce ground loops. I would remove the Gantry and Z axis earths and check again.

Also don't Earth the PC chassis to the Star point. This can cause all sorts of strange happenings. The PC PSU will have it's own path back to earth so adding another affectively creates G-loop.!

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?

If all is correct regards Grounding etc and with good wiring practices then shouldn't be problem. I do this all the time and don't have any issues.

However it's always good idea to keep some seperation of high power/frequency cables like VFD or Mains voltage in respect Signal wires. Esp if the wire runs are long which guess may be on your machine.

[Davek0974]

Also don't Earth the PC chassis to the Star point. This can cause all sorts of strange happenings. The PC PSU will have it's own path back to earth so adding another affectively creates G-loop.!

This is a major one - spent weeks debugging a plasma table build just because i grounded the PC case to the table, disconnect it and instant fix!

[ba99297]

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.

Have you ever check your belts(tooth size, tension)?
Also are your motors and ballscrews bases tight enough?

[Boyan Silyavski]

Gantry have to be grounded to frame on Plasma otherwise you can weld the Hiwin balls together I believe that is correct to connect gantry to machine body whatever the machine, to avoid that bearing fault, it had its own name, but i forgot it...

[JAZZCNC]

Gantry have to be grounded to frame on Plasma otherwise you can weld the Hiwin balls together I believe that is correct to connect gantry to machine body whatever the machine, to avoid that bearing fault, it had its own name, but i forgot it...

Yes to the machine frame but not back to the Star point. Only one Earth cable should go back to this point.! Scott is runnig separate cables back to the Star point which Can/does create Earth loop.!