Making a Knife from an Old Wrench. Epic [VIDEO]

While I'm a bigger fan of railroad spike knives, this wrench certainly makes one heck of a blade. You should DIY this.

There's only one problem with working with old metal, and that's the metal itself. In modern times, we've been pretty spoiled by high-carbon alloys. Old steel is pretty pure, meaning soft.

Have you ever tried welding something old? It's far too easy to blow right through. It's not because the metal is old, it's just not as strong. You'll notice, instead of a gas forge, this blade-smith is heating his steel directly on the charcoal. This allows more carbon from the coal to impregnate his blade.

The more he pounds on it the anvil, the more carbon he's retaining within. That will make your blade harder, but also make it brittle, which is why you should always heat treat your blade after the quench. It'll soften that up a little.