[SML] hot wire foam carving transformer

[Nigel Worsley]

> Not certain of the math involved here

Me neither, so I did a bit of looking around and found this page:
http://hotwirefoamcutterinfo.com/_NiChromeData.html
> I have seen control an 8'-0" length of 20 ga. NiChrome wire for foam carving using  a 600w household dimmer.

That page says the wire will have a resistance of about 2 ohms per foot at the recommended 600F, and will need 5.1A to get there. So 
that is 16 ohms for 8 feet, and 81.6V to drive it - rather higher than I had expected, and a pretty close match for the 600W dimmer.

Nigel Worsley