Re: [TCML] pole pig ballasting

["Bob Arenella" <rja12@xxxxxxxxxxx>]

----- Original Message ----- 
From: "Jon Danniken" <danniken@xxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, July 16, 2008 4:37 PM
Subject: Re: [TCML] pole pig ballasting


Hi Jon,

                   I'm looking at two Thunderbolt welders for ballasting my 
125KV X-ray transformer. One is a clean, older model with the shunt control 
crank on the top. The other is a newer Thunderbolt XL with the shunt control 
crank on the lower front. Any preference as to which one I should go for?

                   Just how is the xfmr designed to allow a variable gap 
for current control?

Thank you,
Bob Arenella
> Buy an 240VAC arc welder on Craigslist; around here they go for between 
> $50.00 and $100.00.  If you get a Miller (Thunderbolt), it has an 
> infinitely adjustable shunt, whereas the Lincoln ("tombstone") units just 
> have different taps; you might find a Montgomery Wards or Century unit; 
> they also work fine, and are often a lot cheaper due to not being a 
> "brand" name.  The bonus is that you also get an arc welder to play around 
> with.
>
> The way you hook it up is to short the "Work" and "Electrode" outputs on 
> the front of the welder, then wire the 220VAC feeding the welder in series 
> with your variac.  Adjust the shunt or use a different tap until you get 
> the required current limiting.
>
> Jon
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