Quantcast
The Grind - Page 4
Page 4 of 4 FirstFirst ... 234
Results 31 to 36 of 36

Thread: The Grind

  1. #31
    Just pulling your leg.

    M


    "If there’s something worth doing, it’s worth overdoing.” - An US saying.

    If my KKF Inbox is full (or not), please contact me via Email: anvlts@gmail.com

  2. #32

    Join Date
    Jul 2011
    Location
    St. Petersburg, FL
    Posts
    1,297
    It only becomes a hollow grind if you leave it in one spot on the wheel. Bill Moran ground his knives freehand on wheels both horizontally and vertically and they were NOT hollow ground. They were convex, but more subtle than ones done on a slack belt. From what I can tell, he basically did the blade in sections like a Japanese sword polisher does and then blended.
    Quote Originally Posted by tk59 View Post
    Murray uses a large round stone to cut the partial "flat" ground bevel. Because the stone has a curved surface, it is actually a little concave according to Jason. To me and my straight edge, it appears to be roughly flat.

  3. #33

    Join Date
    Jul 2011
    Location
    St. Petersburg, FL
    Posts
    1,297
    Actually, my blades tend to bulge in the middle when forged by hand. I have to go back and fix that.
    Quote Originally Posted by JohnnyChance View Post
    Yes, forged knives often have "natural" convexing just from being hammered more in the middle of the blade. Sometimes they actually get thicker down towards the edge again from this, and their thinnest point ends up being in the middle of the blade (minus the actual cutting edge of course).

  4. #34
    Senior Member

    Join Date
    Feb 2011
    Location
    San Diego, CA
    Posts
    4,227
    Quote Originally Posted by ******* View Post
    It only becomes a hollow grind if you leave it in one spot on the wheel. Bill Moran ground his knives freehand on wheels both horizontally and vertically and they were NOT hollow ground. They were convex, but more subtle than ones done on a slack belt. From what I can tell, he basically did the blade in sections like a Japanese sword polisher does and then blended.
    As far as I know, all Japanese knife makers grind with wheels, as well and they are all convex on one side at least.

  5. #35

    Join Date
    Jul 2011
    Location
    St. Petersburg, FL
    Posts
    1,297
    and the single bevel knives that are hollow ground on the other side are done that way intentionally but pulling the blade along the wheel straight and letting the wheel dig into the center, for lack of a better explanation. Yet the same wheeel is used to produce a every subtle convex grind on the other side of the blade.I convex my blades by grinding on a KMG rotary platen and then flattening/thinning it out during hand sanding or on the flat platen if it is too convexed.
    Quote Originally Posted by tk59 View Post
    As far as I know, all Japanese knife makers grind with wheels, as well and they are all convex on one side at least.

  6. #36
    WillC's Avatar
    Join Date
    Jul 2011
    Location
    herefordshire uk
    Posts
    1,607
    Quote Originally Posted by tk59 View Post
    1. Yes.
    2. No.
    3. It looks more "finished" and yes, to be able to "thin" the knife using the secondary bevel as a guide and then going to the primary bevel prevent a decrease in performance due to thickening of the blade behind the edge.

    @Marko: Carter's bevels range anywhere from 1.4 cm to 2.5 cm in width. Del's heel area has excellent performance. He has been optimizing the balance of taper, secondary bevel angle/height toward the tip. I'm assuming that is why Salty is in the process of thinning down his bevels.
    Thanks very much for wading through that! very helpful, in fact this whole thread has been most thought provoking. Oddly its making me want to give some traditional grinds a go. As I've not even tried them yet. I'm finding the idea of control with the beval parting food to one side appealing and would be interested in seeing how the slight hollow on the other affects things.

Posting Permissions

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