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Thread: Design improvement, convexing and grinding

  1. #21
    Delbert Ealy's Avatar
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    Quote Originally Posted by Michael Rader View Post
    Great thread. I've been getting lots of great feedback on my knives from a "pass-around" knife and also JohnnyChance lent me three knives out of his collection so that I can really analyze some features (good and bad) to help my work. The issue of a convex grind is becoming more and more important to me too, as some of the guys were having food sticking issues. As long as we keep learning and refining our work, we can stay in this business a long, long time with much success. Good luck, Del.
    -M
    Thanks Mike,
    I was wondering which of the other custom makers would respond to this particular message. From what I have seen of your work, I know you have a talent for making high quality knives. I am glad to hear you too are responding positively to this message. Take a close look at the knives Johnny is sending you, and I encourage you to use them as well. There are some things you will see in use that you will not get from just looking.
    Thanks,
    Del

    Laminated metals specialist, Kitchen knife and gadget maker
    www.ealyknives.com
    www.mokume-jewelry.net
    "Build a man a fire and he will be warm for a day, set a man on fire and he will be warm for the rest of his life"

  2. #22
    Del, you are going to be a busy, busy man.

  3. #23
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    Quote Originally Posted by Michael Rader View Post
    ...The issue of a convex grind is becoming more and more important to me too, as some of the guys were having food sticking issues...
    The convex grind is about more than the sticking, per se. It is about minimizing drag or friction during the cut as well. I have some fairly thick knives (ie Heiji) that easily outcut thin, flat ground knives (for most jobs) due solely to this characteristic of the grind, as far as I can tell.

  4. #24
    My Mizuno is the same way. The thing about the Mizuno is that I have figured out how to sharpen it like a double sided single-bevel knife - not that there was much figuring out, it just went against my nature from using and sharpening my other double bevel knives. But this goes to what Del said about the convexing needing to be really just a slight blending of two planes. I sharpen at two bevels (one from the cladding down, the other from the cladding about halfway up the blade. This gives two very distinct bevels, until I blend them together with just a few "wavy" motions on the stones. It's not anywhere near a smooth curve, really two planes with the edge between rounded off. The performance increase I got out of the knife when doing this was astounding. The edge was thinner, a little bit, but really I think it was the way food naturally gets pulled away from the main body of the knife. It makes cutting very smooth. The added weight from the thickness of the blade above the bevels really allows the knife to do all of the work. It's because of this that I think we should start using a different term than wedging - for a very thick knife with poor geometry I think wedging describes what is going on well. But some thin knives "wedge", and really I think it's less wedging and more adhesion of the food to the side of the blade causing it to "stick".

  5. #25

  6. #26
    Engorged Member
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    The odd thing is the ITK is a convex grind and the Carter is a partial grind. Both work!

  7. #27
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    So here's an update...Del got the steel in today for my knife! He's got some forging to do but he's planning on getting to work on the knife early next week. Another thing we decided on was doing a leather saya-like sheath. Del doesn't do anything half-assed. The sheath is going to be glued and stitched, and have a thick welt to protect the stitching from the sharp edge. This is going to be an additional cost, but I believe it will be well worth it!

  8. #28
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    Quote Originally Posted by El Pescador View Post
    So here's an update...Del got the steel in today for my knife! He's got some forging to do but he's planning on getting to work on the knife early next week. Another thing we decided on was doing a leather saya-like sheath. Del doesn't do anything half-assed. The sheath is going to be glued and stitched, and have a thick welt to protect the stitching from the sharp edge. This is going to be an additional cost, but I believe it will be well worth it!
    Pesky keep us updated!

    This is something I'm very excited and intrigued about!

  9. #29
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    Quote Originally Posted by El Pescador View Post
    So here's an update...Del got the steel in today for my knife! He's got some forging to do but he's planning on getting to work on the knife early next week. Another thing we decided on was doing a leather saya-like sheath. Del doesn't do anything half-assed. The sheath is going to be glued and stitched, and have a thick welt to protect the stitching from the sharp edge. This is going to be an additional cost, but I believe it will be well worth it!
    I'm sure you can barely stand the excitement, lol! You need to leave that poor man alone to get some work done!

  10. #30
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    Just working out the details...

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