Without a forge, making a knife from a lawn mower blade will be tough. I would suggest getting your hands on some old saw blades instead. I use concrete saw blades for some of my knives. A 24" dia. concrete saw blade is over an 1/8 of an inch thick and makes a good knife. You can maker smaller knives from 10 inch table saw blades. Make sure to use the blades WITHOUT carbide teeth so you know the sleet is good throughout the entire blade.
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