precision tig 275 "problem on AC side"

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We've got precision tig 275. DC side of machine works great. When we switch to AC machine makes loud knocking noise and is unusable. Any clues. Thanks Dan www.microfusionwelding.com
Reply:I don't have this machine, but I have used my buddies. So my answer is limited to my working knowledge here...You say it's not useable as in that it won't strike an arc? Or that you are just worried about the noise?Clunking is odd. Only moving parts I am aware of are the cooling fan in the unit and the cooling fan on the water cooler in the bottom drawer of the ReadyPak version. Did something fall in there maybe?Lincoln Power Mig 210MP MIGLincoln Power Mig 350MP - MIG and Push-PullLincoln TIG 300-300Lincoln Hobby-Weld 110v  Thanks JLAMESCK TIG TORCH, gas diffuser, pyrex cupThermal Dynamics Cutmaster 101My brain
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Reply:More information can help u monday when i get to one. Heard lots o ppl prefer miller over lincoln for aluminum tig. Think i do too honestly. Does your machine have options?
Reply:Did you check the spark gap? There could be some sort of debris in between the contacts, but not sure if that would resort in "clunking".  Check out page D-2 in your manual for Maintenance.  Remove the access panel on the right side of the machine, then take a flash light and look at the gap. If you see any dirt or metal shavings in there, that's your problem.  AC won't work at all without High frequency.  DC will work if your lift start or scratch start, and you possibly could have just enough high frequency to start the arc in DC, but not maintain it in AC.Last edited by Bodhis_Alpha; 05-17-2009 at 05:17 PM.Reason: Didn't read the whole problem with the clunking noise