When I saw the magnetic ground I thought about how crappy mine works, but also thought about you using clean steel. Hope it works out. Mine also just has the stud that you put the neg clamp on, wiring it direct like yours should be an improvement.
Many warning not to clamp to the table. High Frequency plasma noise vs. motors and electronics. The grounding rules are well defined, you isolate the pc/drives/power supply/monitor to the Ac circuit in the wall. The table moving parts and plasma chassis are all into a 6' grounding rod to earth. So you have two grounding circuits to isolate the high frequency so your motors don't run crappy and the software communication is stable.
The irony of isolated ground circuits. Electrical code doesn't allow 2 ground sources from one electrical service, ie: your service having a ground rod and your plasma circuit having it's own ground rod. Having 2 allows a difference of potential between the two grounded components. The instructions for connecting an isolated ground outlet say to do just that.
Just don't put one hand on the table and the other on the metal electrical box that the computer is plugged into with bare feet standing on concrete
If you have decent soil and a good ground it won't be a problem. I'd be leary anywhere there is little soil and lots of bedrock.
easier terms: If one ground is weak and the other is strong there will be voltage across your body when you touch both. Where I live there is poor ground, we used to get a shock opening the freezer door while standing on concrete in bare feet. I measured 60 volts from the freezer handle to the concrete. The concrete was a better ground than my ground rods at the service. I had NSPI come out and check the grounds, I think they drove another rod at the pole.
tidied up the stainless swing out desk and made holes for the wires. bolted the smoked lexan to the desk, makes it a little easier to look at the arc.
Removed the external mounts for the electronics and computer, and plasma, and put them all under the watertray. This involved a fair bit of wiring changes. i'm confident I will never cut thru the bottom of the water tray, but I didn't know when I first built the table if burning thru was a concern, so the water sensitive components all got mounted outside. This was about the time the HRM's stupid ass sewage plant flooded, with the PLC room under the waste tank. i could see the same thing happening.
The computer was hating being in the swath of grinder dust coming from the vicinity of the vice, now it is somewhat more protected and has a filter over the intake. All the power buttons and plasma controls are easily accessable, they weren't before. Had to reach in behind the back corner.
made a metal rack I gotta throw outside. Its for 4x4 sheets.
New circuit board in back from Texas, but stuck at the post office till tommorrow, should be cutting again by Wed.
Another new software upgrade has just been released by Bend-Tech PRO, (toob bending software) called Sheet Metal. It is a CAD program for forming flat plate, with fast, easy, accurate tab, bend lines, and alignment slots. It adds as a module to Bend-Tech PRO.
It will output flat .dxf's for Sheetcam, which in turn generates the code for the plasma table.
So I will be able to much better design bumpers and brackets from folded plate all cut out as one on the plasma table. reducing welding, fabrication time, and therefore cost.
ps: WOW, while i was wring this, the software developer called me and asked about my usage, like current software installed, what brand of CNC table and what sorts of parts I make. He wants feedback once I start using it.
Now that is service.
And on a different note, it's also why I don't pirate the software out to people who ask for it.
Got the Bend-tech 5.0 and SM installed in the house.....just heading out to install it in the shop.
I had a spot of trouble getting the software installed, called Cris at Bend-tech and he setup a link between our computers and fixed it for me. got an extra key file for the shop pc that doesn't have internet, you are allowed to have multiple computers as long as there is only one user, you don't have to buy additional licence.
CreepyCNC - Jan MacLean
'04 LJ Unlimited 2"/33"/RCV
'04 Ram 2500 Cummins towpig
'79 CJ5 V8/Toys/SOA
'85 CJ7 w plow
'52 International COE L180
'13 RockBuggy 4.3/dual-case/Toys/39"
CNC plasma table/pipe bending - pm for custom fabrication