This is a knife that I made from a rasp. I made it about two years ago, it was my first attempt at making a knife.
I built a good fire, threw the rasp in the coals and left it overnight to anneal the tool steel. I shaped it with a grinder, then built another fire in a plow disc that I hooked up some fittings to. Got a good strong fire burning then hooked up my shop vac to the fittings and turned the vacuum on with the hose on the blow side, this made a really nice forge. I heated the blade cherry red until a magnet quit sticking to it, then dipped just the blade side of the knife in some used motor oil. After a couple different fire extinguishers were used up on the oil fire I had in my back yard, I had a hardened blade. I heated my oven to 400 degrees and tempered the blade as my wife looked upon me with with disapproval. Once the blade was tempered, I sharpened it, then polished it up with some 1200 grit sandpaper. After all this I made a grip out of box elder that was impregnated with plastic. I am pretty happy with the results, it is very sharp and it holds an edge really well. It measures 11 1/2" long, 1 3/8" wide, and 3/16" thick with a full tang.
Aaron