In article , Ed Huntress wrote:

You don't have to keep it cool. It can glow red without suffering harm.
However, a brazed-on carbide tool bit will fall apart long before it gets
red, because the brazing material will melt.

You're okay up to dark cherry, normally, unless you're using a lot of
force. I sometimes have to 'unbraze' stuff, and you need a LOT of heat.
Mind you, I deal with large pieces, so that's going to colour my
perceptions.


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Mike Graham | Metalworker, rustic, part-time zealot.
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http://www.metalmangler.com| Caledon, Ontario, Canada