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Sorry, but can you explain convexing?

C

Croesus

Joined
Jan 8, 2012
Messages
16
Ya'll,

I have two new BK-2's in my lap, and I have been reading all these sharpening threads, and I am not understanding "convexing"...I am familiar with sharpening (straight razors, mostly), and have an entire set of Shapton stones...but what I am seeing in the various threads doesn't seem to explain what the term means. Sorry I am being dense here...

Is this like hollow grinding, when you thin out the edge...can anyone show me a convex cross section?

Thanks, love these knives.

Bruce
 
Untitled.jpg


Rough cross section I made in paint. the goal is to remove the shoulder to allow the knife to move through the medium (what you are cutting) easier but having the very tip more robust like that of the original grind. this way you get the best of both worlds a strong edge and good cutting ability without sacrificing the strength of your edge like you would if you were just to make the V grind more acute. Hope that helps. I believe Derek H had a really nice tutorial on here as well as some of the other guys depending on what tools you have available. I have done my 2 and my 14 just using some old stones I had laying around.


100_1417.jpg


You can see on the 2 and 14 how far the convex goes up. This is considered a microconvex. A full convex would be the whole side of the blade. I am by no means an expert but I hope this helps.
 
I had the most difficult time trying to put into words but:
images.jpg

here is a picture i found on the internet:thumbup:

It's got a more gradual incline so it glides across the wood better I feel.
 
A convex edge (if you know the meaning of the word Convex) is the exact opposite of a Hollow grind which is Concave..

On a Flat ground knife with a secondary bevel, you can either Convex the Secondary bevel only or the entire blade grind . Given the .250" BK-2 blade and the steep flat saber grind, a good convex secondary bevel usually works just as well as a full height convex, IMHO.

Either way, it is a bit of in improvement in cutting performance over the standard BK-2 blades
 
Most also tend to believe that convex edges are a bit easier to maintain. First the edge is relatively more robust, and second most people can't free-hand a perfect V anyway, so this is easy to maintain with stroppings and things like that.

:).
 
Well actually I did think of that, but to me convexing would have meant either building up the blade or rounding it off, which didn't make sense. I was thinking perhaps hollow grind before blade edge to thin out the blade while maintaining an original angle on the edge...but that was way over thinking it.

I get it now, makes perfect sense...even with a nail file! Thanks again.
 
hollow grind is its own thing, as you know now :)

google is everyone's friend. except yesterday :D
 
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