Results 1 to 6 of 6

Thread: Making a from a concrete saw blade

  1. #1
    Member Rancid Crabtree's Avatar
    Join Date
    Jan 2014
    Location
    Wisconsin
    Posts
    363

    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
    Member
    Join Date
    Jan 2012
    Location
    KP/NE
    Posts
    117

    Default

    Very nice!

  3. #3
    Member Nukalpiaq's Avatar
    Join Date
    Aug 2007
    Location
    Southwest Alaska
    Posts
    985

    Default

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

  4. #4
    Member cod's Avatar
    Join Date
    Mar 2008
    Location
    Kenai Peninsula, Ak.
    Posts
    2,214

    Default

    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
    Member
    Join Date
    Jul 2011
    Location
    Anchorage
    Posts
    1,121

    Default

    Very nice- I like the filework especially.

  6. #6
    New member
    Join Date
    Nov 2012
    Location
    California
    Posts
    12

    Default

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

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •