On 8/21/2010 1:47 PM, Mark Robinson wrote:
> Interesting. Thank you for sharing this. Useful information
>
>
> I have had good luck with Harris Stay Silv 15 and my oxy acetylene torch.
IIRC only the "Exothermic weld" meets code.
73
Roger (K8RI)
>
> 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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