I'm drilling tool steel, and I dull a lot of bits. I bought a drill doctor and can sharpen them right back up again. They drill wood fine, but back to steel, they do nothing but spin. I heat treat in a knife kiln up to 2200 degrees. I wonder if there would be a way to treat, and if necessary, temper the bits so they would cut steel again. I dulled a carbide drilling D2 and never tried another carbide for $40. I would do fine if I could resharpen regular bits and treat them so they would cut again. I wonder if anyone ever tried it.
