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Re: [TowerTalk] Homebrew Exothermic Mold

To: "David Gilbert" <>, "towertalk" <>
Subject: Re: [TowerTalk] Homebrew Exothermic Mold
From: "Mark Robinson" <>
Date: Sat, 21 Aug 2010 13:47:46 -0400
List-post: <">>
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" <>
To: "towertalk" <>
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.
> 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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