How to make a knife out of an old circular saw blade.
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Step 1: Designing the Knife
First draw you knife shape on the saw blade.
Step 2: Cutting the Knife Out
Second cut the knife out. Cut the knife out with a plasma cutter or cutting torch.
Step 3: Cleaning the Knife Up
Now grind the knife and get the rough edges off the knife.
Step 4: Putting on a Handel
Now put a handel on the knife if you want or just leave it the way it is.