RE: Ballast for pole pig , cheap (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 14 Aug 2007 13:51:29 -0500
From: Rich & DJ <rdj@xxxxxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: Ballast for pole pig , cheap

I want to add the way I built an adjustable inductive ballast and kept it
cheap. You can use a spool of welding wire or electric fence wire, any cheep
or free carbon steel. Look at the roll of 10ga you are going to use, the
hole in the center of the plastic roll can be made bigger. Cut the hole to
its maximum dia. Cut a pieces of the carbon steel wire a little longer than
the length of the spool. Make a bundle that will just slide into the plastic
spool. I did wrap mine and soldered the wrap to make it more solid, also add
a 1/4-20 threaded rod in the center sticking up above the wires, make a "U"
shaped cover for the of spool out of ply wood or whatever. Drill a hole in
the top with the 1/4 rod sticking out, add a wing nut. Now as the wire is
moved in and out of the spool  with the wing nut you can change the
inductance and the load.

Rich , from the middle of Missouri

> Subject: Re: Ballast for pole pig.
>
> Well, it sounds like an inductive ballast is the way
> to go.  I will check on available arc welders in my
> area.  Is there a formula for one of the wire coil
> ballasts people are mentioning?  A formula to
> calculate amps through, how many windings to use, what
> purchase a 0-240/280VAC variac that can take 30-40
> amps?  I have a standard one I use for NST's, but it's
> just a 0-130 (I believe).  Finally, where is Teslafest
> '07? Something like that would definitely help,
> because I'm certainly no expert. Thanks again!
>
> Tyler
>
>
>
>
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