|Forum topic by Danpaddles||posted 10-19-2012 03:00 AM||830 views||0 times favorited||4 replies|
10-19-2012 03:00 AM
I have been carefully sharpening an old carbon steel gouge. I wanted a shallow angle on it, so every time I walked past it, I would pick it up and run against my belt grinder (about 240 grit, a 2 inch wide belt). I used this approach so as not to overheat it, thereby drawing out any heat treatment.
As I got down close to a very nice shallow angle today, almost done, when the front 1/8 inch of the gouge turned blueish. Whoops! I supposed the relatively small amount of metal, as the angle became less, didn’t have enough heat sink capacity.
I let it cool, and started back to grind off a little more of the metal. The blue went away quickly, but has the edge lost its temper, even if it is not (still) discolored? If so, how should I go about re-tempering it?
thanks for your thoughts.
-- Dan V. in Indy