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Warping O1

Discussion in 'Heat Treating' started by Toby Schmid, Nov 14, 2020.

  1. Toby Schmid

    Toby Schmid New Member

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    Had a knife form a nice banana shape( slight exaggeration) in the quench. Tried clamping to a piece of angle iron for the temper cycle ( both cycles actually) and it's just as warped.

    Any tips, or is this another one to hang on the wall of shame?

    Cheers,
    Toby
     
  2. Grayzer86

    Grayzer86 Active Member

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    Did you clamp it straight or overcorrect? I find I often have to overcorrect by about half the bend to end up straight if it’s a particularly bad warp.
     
  3. Toby Schmid

    Toby Schmid New Member

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    I clamped it flat. After tempering, and unclamping it it spring back to its original Warp.
     
  4. dancom

    dancom Dust Maker Best Shop Tool

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    Toby,

    No guarantees, but this one way that I have straighten blades. You'll need two small all steel C clamps, no plastic parts on them.

    Look down the blade and mark the place where you want the straightening to take place. Mark it with a Sharpie.

    Using a rod (big nail, hinge pin etc.) as a fulcrum and an old file or piece of angle iron, clamp the blade with the fulcrum at the point where you marked. See image below.

    Plan to make the opposing bent about two times more than is required to bring it straight.

    [​IMG]

    Set the tempering oven to a just under the original tempering temperature.

    Put the knife/jig into the tempering oven.

    Bake for two hours.

    Let cool, disassemble and check the blade. If required...repeat.

    If you can get it to the point where you can grind out any small curve/warp you should be good.

    Let us know how it goes.

    Dan
     
  5. Toby Schmid

    Toby Schmid New Member

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    Ok Dan - thats a very detailed and appreciated explaination. I'll do it and let you know how it turns out.

    Cheers,
    Toby
     
  6. dancom

    dancom Dust Maker Best Shop Tool

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    You can see from my six year-old graphic this came up some time ago. Hahaha :)
     
  7. Toby Schmid

    Toby Schmid New Member

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    Hi Dan - I'm sorry to report that after following your procedure the warp remains unchanged. I'm thinking of annealing now and starting over.

    Thanks again!
     
    John Noon likes this.
  8. John Noon

    John Noon Well-Known Member

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    Thin sections can warp when they are not symmetrical and the thinner the more a small difference can cause problems.
     

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