convex or semi-convex??

ChristoDart

ChristoDart

Joined
Jun 29, 2011
Messages
750
Ok. This may seem like a dumb question, but I was under the impression until yesterday that the grind for the edge of busses is semi-convex. But it dawned on me that I've actually never seen someone say semi-convex, always convex. I've been sharpening my BJ as a semi convex since I got it and love it. But I was looking at my SOS NMFBM and it looks to be convex. Can someone clear this up for me por favor? Thanks in advance
 
I beleive the NMFBM is convex. Some of the older BM's were convex on one side and a straight angle on the other.
 
ok. so is the boss jack semi, or just convex on both sides. If it is a flat grind on one side and convex on the other side (Semi-convex) then which side is normally flat? (Busse side or non-label side?)
 
Most Busse's are v edges. Forgot to mention that above. Boss Jack included, unless I am mistaken.
 
Only the early SHBM, and few other models were made with the Asymetric Edge. It was revived on a few of the B11s sold at Blade 2010.

For everything else, there is no simple answer. Some blades have a full convex, zero edge (in Busse talk). Many have a v grind edge bevel. Some have a convex edge bevel, sort of like a v grind done with a slack belt.
 
That makes sense. Thanks resinguy. So how do I know what I've got for when I sharpen my knife? I've been doing my BJ with one side on a hard surface and one on a padded. So if it is a full convex, zero edge, then both sides should be sharpened on a "softer" surface?
 
correct. for convex(bj) you normally use a "soft" material like a mousepad, on both sides, creating the same bevel on either side of the blade. Btw, if using a mousepad, it is "extra soft", so most people have problems getting the blade so sharp, as they use TOO much pressure. Only use the weight of the blade, both sides, and you will be good!
 
If there are two different EDGE grinds then it is an 'Assymetric' edge. A convex grind all the way to the very edge is a full convex grind/zero edge. Irreguardless of the blade grind, if the edge is either convex, concave or cantled/flat, that then determines the edge. That is my understanding.
 
It's very easy to tell on a Busse if it has an asymmetrical grind (I call it that out of habit so just assume "semi convex" :) though both terms aren't perfect). The flat bevel is so narrow that the edge profile almost looks like a chisel. It's probably less than a millimeter wide, while the convex side is very wide.

Check out the shots of the two sides in this B11 sale thread: http://www.bladeforums.com/forums/showthread.php/786767-Busse-Basic-11-Sage-Asymmetrical-grind
Even from that camera distance the differences in the bevel widths is very noticeable.
 
Pics of what Busse considers to be an asymmetric edge (which is not the same as nitpicking a slightly uneven/imperfect V-edge grind that technically can be described as being asymmetric). This is the best all around use factory edge I have ever worked with.
Convex side of Asym B11.
jqs3ee.jpg

V-edge side of same knife.
avkfoz.jpg

 
Good pics AZTimT, I would love to see more pics of that stripped CGFBM also...
 
bm11 said:
Good pics AZTimT, I would love to see more pics of that stripped CGFBM also...
Click to expand...

Ok, here ya go. Some of the others in the pics have come and gone while some have stayed, but that one is still around.
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Nice, that looks great! I like the worn in look it has in some of the pics, it shows some character. My CGFBM is actually sitting in a box right now. It's heading back to the factory in the next couple hours for the same treatment.
 
good deal. Thanks for the responses! Now. NMFBM- Comes with a convex edge? Boss Jack - Comes with a ??? edge. And the Basic 10 comes with a V edge?

photos because they make a thread much more fun


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I love the asymmetric edge the best of all of them.
 
Boss jacks all came with a convex edge- or "zero edge". Which is full convex. The blade profile above the edge was convex on the CG and saber on the LE. I just sent my stripped CG out to Okuden for a sheath or I would have posted a pic.

The CG coated blades were all convexed prior to coating, then after coated they were essentially resharpened before being shipped out. This was done to keep as much of the coating on the blade as possible.


Here's a thread with good pics on what's under the coating http://www.bladeforums.com/forums/showthread.php/830081-Jack-the-Stripper/page2
 
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