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nick in blade

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  • nick in blade

    I have what I thought was a good knife a friend had made me. The blade has developed a small nick and I have tried wheels, sand paper, sanding belts, rocks and arkansas rocks and just when I think I have the problem solved the nick comes back. Do any of you have any suggestions to help me alleviate this problem? Thanks, mathcarver

  • #2
    Re: nick in blade

    Boy, have you come to the right place!
    There are a few 'experts' on blades here; I even know a little bit.
    Without knowing how your friend made the knife, it widens the field of possibilities. It would help to know what he made the knife from, whether he heat-treated it or just ground it to shape.

    Judging by your description, my guess, in layman's terms:
    You probably have a crack in the blade.

    In technical terms, you probably have one or more stress cracks.


    • #3
      Re: nick in blade

      I really didn't answer your question.

      If you can see a crack (under magnification) you may be able to grind it out if it isn't too long.

      If it is a 'soft spot' which I doubt, a few more sharpenings may eliminate it.

      If the blade is brittle, you may be able to retemper it (depending on the steel used).

      Probably the best coarse is to contact your friend for his opinion.


      • #4
        Re: nick in blade

        A crack is a good possiblity but I would also suggest that the blade may have a thin spot centered over the nick. When the thin spot is honed or stropped, it will abrade away faster than the thicker metal around it. In a hand ground blade, thin spots are more common than we would like to admit to.

        Gently run the blade between your thumb and forefinger with a very light touch. It is amazing how sensitive your fingers are! You can find thin or thick spots of only a few thousandths of an inch.


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          Reply to Frustrated
          by markdavd
          When a blade slips out, the tendency is to tighten it more. Make sure you haven't over-tightened the clamp forcing the sides apart. Most OEM clamps are made from soft aluminum so once it starts they will continue spreading and it will be near-impossible to keep the blades in place.

          Today, 10:03 AM
        • Sandy Oaks
          Reply to Frustrated
          by Sandy Oaks
          Blade slippage is a function of the blade clamp holder and or the set screw and thumb screw with swivel.
          Today, 09:40 AM
        • NC Scroller
          Reply to Frustrated
          by NC Scroller
          Tricia what saw do you have? Does the blade slip or it just won’t tighten?
          Today, 08:01 AM
        • wjbclocks1
          Reply to Frustrated
          by wjbclocks1
          Are yoou sure that your not puting the blades to far up in the top clamps,. ( l learned thst the hard way)...
          Today, 07:46 AM
        • cwmagee
          Reply to Frustrated
          by cwmagee
          Have you tried to rough up the thumb screws tips? How old are the blade clamps? may be time to replaced them.
          Today, 06:48 AM