On 10/31/08 10:33 PM, Jon Elson wrote: >Oh, MY! You really want to get a commercial-grade noise >filter and surge supressor and put all your computer and >motion-control hardware on that, and make sure the Plasma >machine (both the box and the gun) are insulated from the >gantry.
Thanks for responding, Jon. I don't really know what a commercial-grade noise filter is, but I do have a fancy surge supressor. It never helped with the old system much. I did a bunch of messing around with filtering, grounding and isolation, but it was hard to tell if it did any good because the motor leads were running right into an ISA card on the bus. There is an earth ground on the table and the plasma and things are as separated as I can make them. And I haven't even actually hooked the new system up to the gantry yet. I just manually fired the plasma into the air to see if it would crash Ubuntu. I realize that's not smart, but it's going to happen sooner or later anyway. Once upon a time, I fired the plasma is the air 5 feet away from a short piece of zip cord with a digital VOM on it. It registered 1000 volts, which is the limit. The Esab has an adjustable spark gap on it, just like old school TIGs. >Ethernet is isolated to 3000 V, I think. (I did get one >popped by a lightning storm, but it damaged about 3 other >things at the same time, so it must have been a strong one! >That computer is still in use, but I had to plug in an >ethernet card to replace the on-mobo net interface.) I had a 100' run of cable looping through the shop. It could be shortened up and connected to another hub near the box. The hub on the other end survived. It's possible a box without on-board ethernet and USB would be more resistant, but that's just a guess. Maybe I should just buy the set of 5 GX270s that I saw on Ebay and blow them up one by one as I eliminate the issues. Cheaper than the mobo and a half hour of labor. Please let me know if you have any other thoughts. Thanks, Hal Hal Eckhart - Casa Forge - Minneapolis MN - <http://www.casaforge.com> ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
