Originally Posted by
Ueee
The only thing i will add is when you said cutting oil, did you brush a bit on, or use flood coolant? With carbon steel cutters you really need flood coolant so the cutting edges cannot get hot and loose their temper.
Ok maybe 2 things....as for hardening, use a ferrous magnet to test for the steels curie point as it heats up. As soon as the steel looses its magnetism quench the cutter. Use a ferrous magnet as i have found RE magnets loose their power permanently if they get too hot.
Ew