Originally Posted by
Utopian
You are right to be concerned about losing the temper. To avoid this, I use 6 things:
1. A Dremel with a cutoff wheel used at a slow speed.
2. Patience.
3. A heat sink.
4. A glass of water.
5. Time.
6. A 90 rpm wet grinder.
I hold the blade against a small jeweler's anvil while I cut the blade with the Dremel. I hold my thumb against the blade and if I feel any heating of the blade, I stop cutting and dip the blade in the water. I generally do just a little cutting at a time, so that's where the patience comes in for me. I don't ever try to do it all in one sitting. When I do finally have it cut, I reshape the toe with the 90 rpm wet grinder, which makes it impossible to overheat at that point.
Edit: I should point out that the Dremel I am now using was kindly and generously given to me by Nun2Sharp!