CBT...?

Robdude

Robdude

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Feb 27, 2015
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Hey I've never seen anywhere particular that addresses the idea behind corrugated bevel technology.. strength to weight?.. surface area contact? I've noticed that busse tends to avoid anything that doesnt perform well and they like their CBT.. Is there anywhere you can go read about it?
 
Jerry said a little about it when the AK47 was introduced. You can read that here.

Or here:
The New American Kensei 47 "AK-47" is the second generation of the original American Kensei (circa 1989-97) and offers many performance enhancing improvements. The "AK-47" is now made of INFI and features our new Patent Pending Corrugated Bevel technology. This new bevel technology offers the absolute repeatable accuracy of CNC technology coupled with greatly increased toughness and strength over a typical flat ground blade. It also increases the AK-47's slicing ability by reducing the friction between the blade bevel and the cutting substrate. Rope grooved textured Micarta, G10, or Aluminum handles ensure a positive grip in the worst conditions.

* * *

AK-47 Performance: (click for larger views)
Here is some of the technical and test data that we have put together on the New American Kensei 47 (AK-47).

We went with 3/16" thick stock in order to make it light and fast, the AK-47 has both of these attributes. We followed much of the traditional geometry in order to make it a strong and wickedly efficient cutter.

​
The grinds are so unique on the new AK-47 that we have a patent pending on the process. We call it a "Corrugated Bevel". The Corrugated Bevel on the AK-47 is convex and allows us to offer the absolute accuracy and repeatability of CNC technology with greatly improved performance over traditional grinding methodologies. When compared to flat grinds or traditional hand ground convex blades out of the same material and heat treat, there is a marked increase in both strength and flexibility. The edges are taken to near "Zero" prior to coating and are left very fine for cutting soft targets. We went with a more traditional style point as opposed to what is commonly referred to as the "Americanized Tanto Tip". The American style tip is typically stronger but greatly reduces slashing power while the more traditional tip allows for much better full length cutting performance and point penetration. With the enormous strength of an INFI foundation on this blade, we were afforded the opportunity to incorporate the better slashing traditional tip design.
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The CBT on the original AK47s is much finer than what we saw on later blades (it could almost get lost in the coating), but I assume the same logic applies,
 
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And on the Hell Razor here.

Or here:

The Hell Razor is one of the meanest models to ever escape the Busse Combat Shop!

This pic clearly shows our patent pending Corrugated Bevel Technology (CBT).

The corrugated bevel not only greatly strengthens the blade but reduces the overall weight of the blade while reducing the cutting friction along the entire height of the bevel.


Click to expand...
 
Also, if it increases surface area on the blade, in the manner of flutes in a rifle barrel, would not friction increase when cutting certain media? Say meat or soft things?
 
I personally am not a fan of the large cbt grooves. Although I love groovy things dude, ...CBT is a PITA to keep clean and maintain for me. Neked and smooth is my likin'
 
Wow I havent seen that old site for ever...I thought it was gone. How the hell?
 
Warbow150 said:
Then how does it increase strength?
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I believe it's a strength-to-weight thing. Cutting the grooves in it wouldn't make it stronger than a blade of the same thickness without the corrugations, but a CBT blade would be stronger than a thinner blade of the same weight. Basically the same idea as a fuller.
 
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Just seems an odd statement, that it “greatly strengthens the blade but reduces the overall weight of the blade while reducing the cutting friction along the entire height of the bevel.”

Those three things seem mutually exclusive.
 
Splitting something rigid, like seasoned wood, there would be less steel in direct contact with the wood. In theory, less surface to surface friction. In practice, just splitting some pine here & there goofin off... meh.

In my usage I haven't seen a discernible difference between my CGFBM w/CBT vs. NMFBM enough to fully recommend CBT over non CBT. But maybe I haven't hit it hard enough yet.;)

They seem to perform about the same to me. My CG is about 3 ozs. lighter, but again, not that noticable to me when using. If I used it all day then that's where I'd likely see the difference.

YMMV

The deal clincher to me it comes down to how it looks. I like CBT on some models, on others not so much. As a matter of personal taste, there's no contest for me in how a HG55 with large CBT looks like in comparison to a non CBT 55. To someone else, they may think CBT is ugly...life is still good. :)

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my avatar:
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shqxk said:
Saying CBT reduce the friction of cutting is like saying tire thread is for reducing traction... is obviosly work opposite.
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Unless the CPT reduces binding or adhesion to the blade -- like a Granton edge on a slicing or carving knife.
 
JohnTheTexican said:
I believe it's a strength-to-weight thing. Cutting the grooves in it wouldn't make it stronger than a blade of the same thickness without the corrugations, but a CBT blade would be stronger than a thinner blade of the same weight. Basically the same idea as a fuller.
Click to expand...

Exactly!
 
As a new piglet I'm not the purist that some seasoned elders might be. There are some blades I like for particular reasons of practicality or perceived awesomeness but for me CBT looks great where it's used because that's what Jerry decided it was going to be. I'm good with that, and above all, don't matter where you're at on it, when you see a blade with CBT you know it's a Busse- No one else does it, there's only one.
Conversely, a Grudge or Fudge with that deep hollow is the same, uniquely Busse and no other like it just as it is.
I think when the Forsaken Gemini lands this might be discussed because he's mixed the old and the new. I'm OK with it, I secretly wished for this combo just so I might have a shot at an Infi TG is some iteration of my own NIB- This one is a small dream come true for me yet I can imagine it might not sit well with the old guard as the TG holds a special place in Busse lore. So CBT ME! It's Groovy Baby! :D`
 
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