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Ever since I made my first ninja throwing star in metal shop class, I’ve always wanted to make my own knife. But I was put off by the notion of having to acquire the furnace, anvil, leather apron, and handlebar mustache requisite for forging a proper tempered blade. So, instead I decided to make a utility knife by cutting out a pattern from a circular saw blade, using my Dremel Rotary Tool.



7″ steel circular saw blade new, or recycle an old one
Dremel Rotary Tool with metal cut-off wheel, grinding stone, wire brush, polishing wheel and polishing compound
Drill and 3/16″ drill bit
Cardboard and pencil to draw a pattern
Permanent marker
Small metal file
Safety goggles
Paracord (4′) and plastic cord ends I got both from

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John Edgar Park

John Edgar Park

John Edgar Park likes to make things and tell people about it. He works at Disney Research and writes for Make and Boing Boing. He is training for American Ninja Warrior. You can find him at and twitter @johnedgarpark — if you like that sort of thing.

  • richardpenson

    Looks a lot like the way this one was made:

    • John Park

      Cool, I hadn’t seen that one, but I should make it clear that the idea of using saw blades for knife blanks is an old one, not my own! Old files are pretty great, too.

  • BFlatTech


  • BFlatTech

    dis is awesome

  • BFlatTech


  • BFlatTech

    i am 5 can i make this?