What does "full" mean in a edge grind?

T

ThunderJellyFishhh

Joined
Sep 22, 2016
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6
Why do some knife grind include the word "full"

Like " full flat grind". "full convex grind"?

Why not just "flat grind" and "convex grind?"

or even more words like "partial". or "full high?

Examples: "partial flat grind", "Full high convex"

Can anyone explain what any of this means?
 
It designates whether the grind goes all the way to the spine (full/full height) or not (partial/saber).

~Chip
 
Full flat grind goes all the way up to the spine. A partial flat grind would be one that still has a flat, but one that is smaller than say on a saber or scandi grind. think maybe 1/4-1/3 of the blade width as opposed to 1/2 to 3/4. A full convex grind would be the same thing, which would differentiate it from a grind that just has a convexed edge which is quite common on ABS style knives of the "Arkansas School" and custom kitchen kitchen knives. Things can get even more complicated than that. I ahem made some kitchen knives which had an S grind. My version of that grind starts off as a two faceted flat grind, i then put a very shallow hollow ruling down the middle of the blade and blend it all in and finish with a very shallow convex lower section that comes up about 3/8 of an inchworm the edge and it then thinned out behind the edge. Confused yet? :D
 
The Bravo 1 comes with a convex grind but stops short of going all the way to the spine. You can see the small, flat portion on the side. Compared to the full height convex grind in the second picture. Notice it does not have the flat spot.

bravo-1-a2-black-canvas-micarta-239.95__70432.1469038837.500.659.JPG
bravo-1-a2-black-canvas-micarta-rampless-full-height-grind-239.95__03463.1469038993.500.659.JPG
 
jdm61 said:
I call that a BAD convex grind. ;)
Click to expand...

Yeah. That's what you'd get if you pressed a piece of stock into a slack belt with so much force that it caused the spine to touch the belt. That's just bad grinding in almost all cases. A full convex would be like an Opinel. It's full height, and convex. That geometry should still start at the spine with parallel tangent vectors.
 
I have seen those bad spine grinds on the current Zwilling Kramer Essentials line of kitchen knifes. As I mentioned in another thread, Bill Moran said that if you are trying to do a full convex grind with a slack belt, you are dong it wrong.
FortyTwoBlades said:
Yeah. That's what you'd get if you pressed a piece of stock into a slack belt with so much force that it caused the spine to touch the belt. That's just bad grinding in almost all cases. A full convex would be like an Opinel. It's full height, and convex. That geometry should still start at the spine with parallel tangent vectors.
Click to expand...
 
jdm61 said:
I have seen those bad spine grinds on the current Zwilling Kramer Essentials line of kitchen knifes. As I mentioned in another thread, Bill Moran said that if you are trying to do a full convex grind with a slack belt, you are dong it wrong.
Click to expand...

I agree. Facet grind, then blend.
 
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