Kit's Machine

[phill05]

We had a problem at one stage that sounds close to what you have, we had the screen connected at both ends, to remedy took off screen at spindle end now left with 3 +Earth, ( 4-core CY cable) connected spindle to VFD, at the VFD end the screen was stripped back and finished at star point in cabinet, VFD was fitted in same cabinet on the same power line in.
Been running for four years no problems.

Phill

[Kitwn]

We had a problem at one stage that sounds close to what you have, we had the screen connected at both ends, to remedy took off screen at spindle end now left with 3 +Earth, ( 4-core CY cable) connected spindle to VFD, at the VFD end the screen was stripped back and finished at star point in cabinet, VFD was fitted in same cabinet on the same power line in.
Been running for four years no problems.

Phill

Thanks Phill. I might try this, though at the moment I just want to start making some bits with a working machine, which is what I now seem to have. I expect that I will soon have to bite the bullet and upgrade to an AXXB-E and UCCNC to make things more reliable. It will also be intereststing to see what difference this makes to the maximum speed of the machine and the surface finish as ONE OF THE USEFUL THINGS I'VE LEARNED FROM MY OSCILLOSCOPE (subtle hint there you notice ) is that the pulse timing from LinuxCNC and it's parallel port are far from perfect. Long ago I set up a test and measured the step pulse interval at 125uS with frequent (approx 1 in 8) pulses at either 100 or 150uS (always +- 25uS). That's a pretty dramatic error and cannot be good for best performance.
I have now got the mechanical side of the machine working quite well, as far as my limited experience can tell, so an upgrade to the control side is worthwhile. I will keep yours and Dean's comments in mind when that rebuild gets underway.

Kit