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Old 04-14-2019, 12:00 PM   #1 (permalink)
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Miller Thunderbolt

Really is there a better name for a welder? I want to have the capability of running my Readywelder off of house power so my old Sears AC stick welder was not going to cut the mustard. I picked up a old Miller Thunderbolt off of craigslist for 100 bucks with no leads but I did get a set of pins. When I powered it up at home it did buzz but the fan did not go on. When I spun the handle on top the fan did go on but it didn't sound very happy. I will open it up next week and have a look inside of it. The top handle seemed like it had way too much friction on it and was difficult to turn.

Does anyone have one of these classics? Pic is not mine but looks to be the same model
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Old 04-15-2019, 05:10 AM   #2 (permalink)
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my dad has one allot older than than. as far as I know, its still working.
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Old 04-15-2019, 06:37 AM   #3 (permalink)
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FWIW the model is called a Thunderbolt AC/DC and mine was made around 1982. I opened it up and blew out a couple of mouse nests and a half pound of dust and crap. A bit of oil on the moving parts inside and the shunt slides up and down nicely. A few drops of oil and the cooling fan is humming along fine. I am getting voltage readings on AC and DC but they are constant no matter of the amp settings but I don't think that is an issue as that is considered open center voltage? If I have time in the next couple of days I plan on hooking up the ready welder and giving it a go. If not than it will be buried for a while. For 100 bucks I think I did good.
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Old 04-15-2019, 08:05 AM   #4 (permalink)
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had an old Airco AC 225 for a while that was a Miller Thunderbolt with orange paint. All I had for a while was 30 amp dryer power so I could get about 110 amps out of it before it popped the breaker, but that was more than I needed at the time to burn 6011s on 1/4" steel in my poor boy garage.

I have much nicer now, but any time you get a DC stick welder for $100 or less I call it a win. Most of what you find are AC only machines. DC stick is so much nicer.
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Old 04-15-2019, 09:32 AM   #5 (permalink)
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Quote:
Originally Posted by ChiScouter View Post
Really is there a better name for a welder? I want to have the capability of running my Readywelder off of house power so my old Sears AC stick welder was not going to cut the mustard. I picked up a old Miller Thunderbolt off of craigslist for 100 bucks with no leads but I did get a set of pins. When I powered it up at home it did buzz but the fan did not go on. When I spun the handle on top the fan did go on but it didn't sound very happy. I will open it up next week and have a look inside of it. The top handle seemed like it had way too much friction on it and was difficult to turn.

Does anyone have one of these classics? Pic is not mine but looks to be the same model
Got the same one at work, works great and handier than swapping leads on the syncrowave. Doesn't burn 6010 QUITE as good as the syncrowave, but more than adequate and it runs it a lot better than the mp210.
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Old 04-15-2019, 02:12 PM   #6 (permalink)
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I have one. Use it occasionally for any stick welding I need, and I also have a scratch start TIG setup on it that works well enough.
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