mutiple machines and work grounding

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My setup at work:Miller Deltaweld 652, Lincoln Squarewave Tig 355, three seperate tilt/rotary positioners, Thermal Dynamics Cutmaster 80XL.  The ground lead on the Deltaweld is hardwired to all three positioners, with another lead with a gound clamp on it.  The clamp normally is on my table.  Is there any reason that I can't just attach the Tig or plasma cutter's ground to the table when I need to work with either of them on a positioner?  Only one machine is in use at any given time (I'm only one guy ).  All work on the positioners is carbon steel, so the Tig is set DCEN.  Would AC cause a problem with the other machines?
Reply:When I worked doing patch and inspect in a production facility we had 4 welders all hooked up to the same ground and sometimes we would use more than one at a time. No trouble at all. This table had a 800 amp GMA arc gouging unit 450 amp Miller delta weld for MIG a 600 amp lincolin stick and a 600 amp Miller for MIG with big wire 5/64". Steel Thunder Welding LLC. St. Thomas VI USAMM350PBOBCAT 3MAXSTAR 150 STH375 EXTREME PLASMA6.5 HP COMPRESORDEWALT 18, 24, AND 36 VOLTO/A TORCH SETAND SO MUCH MORE I DONT REMEMBERALL IN MY 2005 2500HD EXTENDED CAB L/B
Reply:It will be fine as long as all machines are properly wired into the building.
Reply:Originally Posted by Static-XJ...The ground lead on the Deltaweld is hardwired to all three positioners, with another lead with a gound clamp on it.  The clamp normally is on my table......(when working through the positioner's ground) Is there any reason that I can't just attach the Tig or plasma cutter's ground to the table...
Reply:working in the sawmill all the ground connections were hooked up to the nearest piece of steel and that  grounded all of them at the same time to pretty much the whole mill, there were lots of times where we were welding side by side on projects, if we were close to a bering we would use a "jumper" to help from frying it. sometimes at work the plasma cutter and the welder will be ground up to the same project. either or both could be on or on and i have never had a problem so far the machines are ment to pass current and i belive they need the circut to be completed first.Nothing Ever Got Done By Quitting, Never Give Up.