Hi All,
I've been working on my Takisawa lathe for a few weeks now and am making great progress thanks to Hood, Peter and others. I was having a noise problem and finally fixed it and wanted to share what fixed it for me in case someone else has the same problem.
What was happening is whenever the spindle was on I would get intermittent false triggering of my external e-stop, and I had some major problems with the computer dropping the USB keyboard connection. It turns out if the keyboard disconnects while jogging, it keeps jogging (E-stops are good :-)). Replacing the keyboard made that problem go away, but I was still getting false e-stops all the time even with de-bounce set to 2000. The computer was plugged into a separate 110V outlet from the rest of the lathe so I knew that the two grounds were probably at substantially different levels, and the noise on one would not be common with the other. So I decided to run the PC and monitor off of 240V, which almost all monitors and power supplies have an option for. I lopped off the 110V US plugs and just wired it right into an existing circuit with a breaker inside the control panel, and grounded them to the main tie-point. No more problems, so far :-) Everything on the whole machine now runs off of the 240V 3-phase coming in and has a SINGLE nice solid ground back to the service.
I'm sure there are a zillion ways to fix noise, and it is more black magic than science (if you ask me...) but this worked way better than I thought it would so thought I would share.
Dustin