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High freq maintenance
Posted: Tue Jan 08, 2019 2:53 pm
by starvncoyote
We got an old square wave 355 that has been starting to eat up the electrodes for the high frequency starts. We have the gauges, it's at the suggested spacing. I still got some ideas dealing with resistance to track down but would appreciate feed back and any ideas in case I'm wrong.
Re: High freq maintenance
Posted: Fri Jan 11, 2019 2:12 am
by Otto Nobedder
First thing I'd try is polishing the electrodes. I'll remove them, chuck them one at a time in a good drill press (a mill is better) and run them against a fine flat grinding stone. This knocks off all the tiny arc marks and lets you start with fresh metal. Then reinstall, rinse with electrical contact cleaner, and reset your gaps.
90+% of the time, this resolves HF issues.
Steve
Re: High freq maintenance
Posted: Fri Jan 11, 2019 3:41 am
by Coldman
Stone the crows! Look who's back!
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Re: High freq maintenance
Posted: Fri Jan 11, 2019 1:14 pm
by LtBadd
Coldman wrote:Stone the crows! Look who's back!
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That's how I cleaned them, or with a fine grit silicon carbide paper as the turned