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Thread: Making a from a concrete saw blade

  1. #1
    Member Rancid Crabtree's Avatar
    Join Date
    Jan 2014

    Arrow Making a knife from a concrete saw blade

    The shadetree knife maker is always looking for blade material. Repurposing metal is always a treat. This blade is over an 1/8 of an inch thick. I am using a 24 inch diameter concrete saw blade. I cut a few small pieces from this blade and heat treated them and took them to work and used a hardness tester to see how effective my heat treat really is. The untouched blade material came in at Rockwell 35. The heat treated material came in at RC55 for hardness. A file is RC60. These will hold an edge nicely.

    I cut a chunk of it away with a angle grinder.

    This will be a hunting knife with a drop point and a finger guard.

    This is a very thick blade.

    Next, I heated the blade cherry red and let it cool very slowly to soften the steel. so I could drill holes and grind a bevel and do some file work.

    this time I am going to do a "W" pattern on the backbone of the blade. I marked off the spacing with a sharpie.

    Then I used a small square file on one side of the blade.

    Then turned the blade around and did the other side.

    I added a little bluing to bring out the details.

    With all the file work done, I heat treated the blade by heating it until it was non magnetic (around 1500F) and then quenched it in 130F salt water. Next I temper it at 400F for one hour. Finally I polish the blade to a mirror finish.

    I used curly maple and aluminum pins. I'm calling it "Blonde"

    The last step is to make a sheath. I use 7 Oz. Veg. tanned leather and then dye it to the color I want after I sew it.

    This knife will has elk slab scales. It was a prize I made for a turkey contest. The blade comes from the same 1/8" thick rusty old concrete saw blade.

    For the first step in stock removal, I use a 6 inch bench grinder. I simply clamp a metal stop on the tool rest to keep things consistent

    I move it once to get closer to the tip after removing material from higher up on the blade. The tape is to keep me from grinding away the finger guard

    I follow up with a belt sander to smooth out the grind marks.

    This leaves more of a straight or convex grind which is slightly stronger than the conventional concave grind.

    With all the stock removal done and the blade heat treated, I give the blade a going over with 120 grit sandpaper on on orbital sander.

    I will use elk antler for the scales.

    I split the section in half and sanded them to shape.

    I added the antler scales to the knife blade. I used slow cure epoxy and brass pins. I turned out fairly well.

    That rusty old blade sure cleans up nice. It was pretty much like a mirror.

    Another knife from that same saw blade with alum. bolsters and a Cocbolo handle. I also used homemade mosaic pins to dress it up.

  2. #2
    Join Date
    Jan 2012


    Very nice!

  3. #3
    Member Nukalpiaq's Avatar
    Join Date
    Aug 2007
    Southwest Alaska


    Thanks for sharing the pics. Knives look like they have good skinning blades.

  4. #4
    Member cod's Avatar
    Join Date
    Mar 2008
    Kenai Peninsula, Ak.


    Thanks Crabtree. I might have to give knife making a try when I get some spare time.
    Your sarcasm is way, waaaayyyyyyyy more sarcastic than mine!

  5. #5
    Join Date
    Jul 2011


    Very nice- I like the filework especially.

  6. #6
    New member
    Join Date
    Nov 2012


    Nice work, I had some material to use, gave it away


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