To forge a knife, heat your metal to a high temperature, and then shape it to a blade and point using a small sledgehammer. After shaping, harden the blade by submerging it in either oil or water.Continue Reading
In a forge or metal-working furnace, bring the metal to at least 2,100 degrees Fahrenheit. The metal begins to appear yellow in color at this temperature.
With a 3-pound sledgehammer, repeatedly tap the metal to bring the blade and point to definition. Leave room for the tang, which is the part of the blade that extends into the handle.
Once the blade has taken shape, harden it by submerging it in oil or water. Water is faster and may result in a harder steel, but it may also create a more brittle or corroded blade than oil.
Once it is hardened, temper the blade in an oven for 20 minutes at 400 degrees Fahrenheit.
After tempering, let the blade cool, and then affix a handle. Drill holes on the tang, and use them to fasten the blade with screws to the two sides of your wooden handle. Alternately, wrap wire, cord or leather around the tang to be used as your handle.