Here is a knife I made out of a 2 by 4 and a printer bracket.
Step 1: Step 1
I flattened the bracket for the knife blade.
Step 2: Step 2
I then cut a 2 by 4 for the handle. I cut two pieces in case one broke. After that I fastened the blade to the handle with 1/2 inch wood screws. I sharpened it and Presto!!! the Knife. It cuts wood pretty easily.