Interesting. Thank you for sharing this. Useful information
I have had good luck with Harris Stay Silv 15 and my oxy acetylene torch.
Mark N1UK
----- Original Message -----
From: "David Gilbert" <xdavid@cis-broadband.com>
To: "towertalk" <towertalk@contesting.com>
Sent: Saturday, 21 August, 2010 12:54 PM
Subject: [TowerTalk] Homebrew Exothermic Mold
>
> I fabricated my own Cadweld-type mold for making ground rod connections
> while I was installing my tower about a year and a half ago, but I only
> recently uploaded the description and pictures to my web site. It's an
> easy procedure and with a little thought a mold could be made for just
> about any configuration or purpose. Here's the link in case anyone
> might be interested.
>
> http://www.ab7e.com/exothermic/AB7E_Homebrew_Exothermic_Mold.html
>
> At the time I even tried to make my own weld powder (thermite). It's
> fundamentally a combination of copper oxide and aluminum power and the
> formula was simple to figure out, but I couldn't find materials with the
> right particle size. The stuff I found was all very fine powder and
> while the mixture reacted, it did so too quickly and the result was more
> like the old flash trays they used for taking photographs in the
> 1800's. If I could find an easy source of coarser powder I might try it
> again sometime, but in reality you can usually find regular Cadweld weld
> metal on eBay for the equivalent of one dollar per shot or less. I
> always look for the largest containers I can (usually 200 grams) because
> they usually are the cheapest per gram. I can typically get three shots
> out of one 200 gram cylinder. Don't worry about running out of the
> starter powder (which appears to be just the same formula with smaller
> particle size like I played with anyway) ... 4th of July sparklers work
> fine to fire off the regular Cadweld powder.
>
> 73,
> Dave AB7E
> _______________________________________________
>
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