1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Edge Chipping

Discussion in 'Heat Treating' started by colonel3006, Jul 14, 2018.

  1. colonel3006

    colonel3006 New Member

    Likes Received:
    1
    Trophy Points:
    3
    I'm fairly new at this, so I'm sure this is a real newbie question. The first knife I made using 1084 that turned out decent enough to stay out of the scrap bin, I just found that it is developing small chips out of edge when I used my small hand sharpener that has the coarse,fine and ceamic rods. When I sharpened the first time I used whet stones so I didn't have this problem, and got very good edge. Being as I haven't been at this long, I use a homemade charcoal forge I built from an old BBQ which I rigged a 1/2" steel pipe with small holes and made a fitting to connect my air compressor too.
    I heat them to non magnetism, and quench in canola oil. Then I use an old toaster oven with thermometer and temper to 450° for an hour, air cool and again for 3 times total. It has worked out perfectly for the other few I've made, but for some reason not this one.
    My question is after grinding these chips out, should I be heat treating again? Then for tempering should I go a little hotter? Like I said kinda newbie question, but from the short time since I've joined this forum, and reading just some of the knowledge here I'm sure I can the right answer. Thanks for everybody's time reading.
     
  2. ToddR

    ToddR Putterer, Tinkerer, Waster of Time Staff Member

    Likes Received:
    196
    Trophy Points:
    43
    To me, it almost sounds like it's too hard. Is there any chance that the toaster oven isn't working properly and didn't temper correctly? That's my guess. It definitely sounds like it's too brittle to me.
     
  3. jonliss

    jonliss Active Member

    Likes Received:
    29
    Trophy Points:
    28
    When you say hand sharpener, what are you referring to? The angle may have been a bit too fine for the steel you’re using. Tempering cycles sound about right, so. I don’t think it is too hard.
     
  4. colonel3006

    colonel3006 New Member

    Likes Received:
    1
    Trophy Points:
    3
    Just one of those pull through hand sharpeners with the coarse steels and fine rods and ceramic rods. I rarely ever use it, I always use wet stones. I tried the few other knives I've made through the pull through sharpener after just to see if the same chipping would happen, and they were fine.
     

Share This Page