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[ironsides]

... let me ask this...

Do you have dust collection? If so is it grounded?
Not knowing how your cables are run are you rolling over your communications cables with your chair? It might be a possibility that you have some type of short in your cable?

...?

Jack,
Yes I have/use a DC while machining.
All cables are behind the SB out of my work area.

Consider this current situation:
1) I am carving seven plaques for a family member.
2) The first cutting file (rough machining with DC on) and is about 90 minutes long. The program seems to go about half way through then stops with a "Comm" message.
3) The second cutting file (finishing with DC on) is 6 hr 40 min long. It runs fine with no "Comm" errors.

The only thing different is that the rough machining process is using more cutting force on the spindle and stepper motors and the amount of dust is greater than on the finishing program.

I have copper wire running through the center of the hose and wrapped around the hose. The copper wires are connected to the DC frame and the SB electrical panel frame.

George Kelly

[seana]

Hey George,
If i read you post correctly then the problem may lay in a ground loop. The ground wire for the DC should not connect to the SB at all keep it isolated to just the DC. Have a Ground wire on the SB and not connected to the DC and i will guess your issues will go away.
My guess is that your getting static electricity from the DC going to the SB.
Still run the copper wire inside the DC hose from the SB (just not touching anything metal) and to a good ground on the DC.

Hope this helps

[ironsides]

Hey Sean A.

Your suggestion may be the root of my problems. I will reconfigure the wires in the next few days and see what happens.

Thanks for the tip.

George D Kelly