That's a big, open field. Are you interested in forging, or are you thinking stock removal (grinding)? The first I made was forged out of drill rod using a propane space heater for a forge one cold winter day. It was (and is) ugly as original sin, but it worked for the beater chores I made it to do. The second was ground out of an old file. In retrospect, I probably should have annealed it first (it's a real chore to sharpen) but I had no clue how to reharden it. Those knives were made with next to nothing for tools. Hammer, anvil, bench grinder, a 100,000 btu/hr space heater (okay, that one is a little unusual) and enthusiasm. You can probably get much better information by visiting "Around the grinder" in the Knifemakers forum.
Howdy! My real name is Jack.
SpyderNation citizen 409.