On Thursday 19 May 2016 12:26:53 Jim Craig wrote: > I think in addition to the message box in the g-code file I will add a > HAL message component that will trigger off a one shot component that > is connected to the machine on state. This way each time the machine > is turned on the pop up message will show up to remind the user to > connect the ground. (just in case as I am a forgetful dummy). > > On 5/19/2016 10:57 AM, Dave Cole wrote: > > Also, you will find out that how you put the clamp on the table will > > affect the plasma flame "direction". The plasma flame will point > > somewhat in the direction of the best ground. > > If you clip it on one leg and the other legs and supports are not > > well connected you will see the effects of the poor ground path in > > your cuts. The way you ground a plasma table is really important. > > > > Dave > > The ground is normally placed on the grid in the water table. This > gets the ground as close to the part as possible and creating a > distributed ground grid under the plate being cut. What is the > suggested best method to ground the table to the plasma cutter to > prevent the directional arcing? > > Thanks, > > Jim
This is a bit of a puzzle. First, connecting to the support grid is guaranteed to be a poor ground, as that will have to spot weld itself at someplace where the work is laying on the grid. With the oxide coatings present on 99% of the metal that goes under the torch, its going to be a hit & occasionally miss problem. Connecting the end of the star to the grid is OK, but from the grid to workpiece, I think I'd go get 4 small c-clamps, weld or bolt a 9 or 10" ground cable to them, bolting the cable to a handy place on the grid so that you can pick the clamps up and put one at each corner of the workpiece. Screwed to about 1/4 turn from broke, that should give you a good, very low ohms ground. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
