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- Apr 3, 2013
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- 1,105
I was asked by Konstantin of gritomatic if I wanted to test some new clamp's that he started carrying and they are made by a company called KakBritva out of Russia.
These are their undercut clamp's that have a tapered cut in the jaws for knives with distal tapers like Spyderco's,they have different degree's that you can choose from that the undercut is cut at and is indicated on the side of the clamp's by dot's that are machined into them.
The KakBritva clamp's can be used with TSProf Hapstone and the Jende Jig's systems and you buy a 3D printed adaptor made by gear connect for the sharpener you want to use the desired clamp with.
The next 2 picture's are of KakBritva's double clamp and also their split clamp,you can see there are 3 dot's machined into the split clamp and that mean the undercut is 3 degree's.
These are KakBritva's standard single clamp's and scissor attachment.
To use the scissor attachment right now with the TSProf you need to use a 4mm bolt instead of a 5mm bolt so the bolt goes threw the crossbar.
There is a slot where a nut goes into on the scissor attachment and the slot is meant to hold a 5mm nut and the 4mm nut just spin's inside the slot unless you pull back on the bolt and tighten it by hand until it stop's then you can tighten it the rest of the way with a wrench.
I can see 2 of the scissor attachment's coming in really handy for doing planer blades.
The one thing I found with the KakBritva clamp's is that they didn't hold thin knives very well at all and I also found I couldn't get any of them to hold distal tapered knives very well either like Spyderco's,I was able to get thicker knives to hold better .
I'm not 100% certain on the problem with these clamps but I think it maybe a 2 part problem,the first thing I can see is that the screws are mounted farther away from the tip's of the jaws then what my TSProf milled clamp's are and that takes away camping force from the tip of the jaws.
I think the other problem is that it may help if the screws that tighten the jaws went threw the jaws on the downward angle part of the as well,but the problem is they use a plain nut that the screw goes into rather then threading one of the jaws.
As you can see this is the cutout window where the nut sit's in so it can sit flush with the jaws,I like the idea of bolt going threw a nut of some kind that way you don't have to worry about stripping the jaw,I think KakBritva placed the screw farther back on the flat part of the jaw of the clamp so it would be easier to machine the window for the nut on a flat surface rather then on an angle.
I would have rather seen KakBritva make a cone nut like Jende did for their Jigs system that use's a metal cone with has a hole that's been threaded and the cone nut sit's in a machined out female cone shape and bind's up when it's tight.
These are their undercut clamp's that have a tapered cut in the jaws for knives with distal tapers like Spyderco's,they have different degree's that you can choose from that the undercut is cut at and is indicated on the side of the clamp's by dot's that are machined into them.
The KakBritva clamp's can be used with TSProf Hapstone and the Jende Jig's systems and you buy a 3D printed adaptor made by gear connect for the sharpener you want to use the desired clamp with.

The next 2 picture's are of KakBritva's double clamp and also their split clamp,you can see there are 3 dot's machined into the split clamp and that mean the undercut is 3 degree's.


These are KakBritva's standard single clamp's and scissor attachment.
To use the scissor attachment right now with the TSProf you need to use a 4mm bolt instead of a 5mm bolt so the bolt goes threw the crossbar.
There is a slot where a nut goes into on the scissor attachment and the slot is meant to hold a 5mm nut and the 4mm nut just spin's inside the slot unless you pull back on the bolt and tighten it by hand until it stop's then you can tighten it the rest of the way with a wrench.
I can see 2 of the scissor attachment's coming in really handy for doing planer blades.


The one thing I found with the KakBritva clamp's is that they didn't hold thin knives very well at all and I also found I couldn't get any of them to hold distal tapered knives very well either like Spyderco's,I was able to get thicker knives to hold better .
I'm not 100% certain on the problem with these clamps but I think it maybe a 2 part problem,the first thing I can see is that the screws are mounted farther away from the tip's of the jaws then what my TSProf milled clamp's are and that takes away camping force from the tip of the jaws.
I think the other problem is that it may help if the screws that tighten the jaws went threw the jaws on the downward angle part of the as well,but the problem is they use a plain nut that the screw goes into rather then threading one of the jaws.
As you can see this is the cutout window where the nut sit's in so it can sit flush with the jaws,I like the idea of bolt going threw a nut of some kind that way you don't have to worry about stripping the jaw,I think KakBritva placed the screw farther back on the flat part of the jaw of the clamp so it would be easier to machine the window for the nut on a flat surface rather then on an angle.
I would have rather seen KakBritva make a cone nut like Jende did for their Jigs system that use's a metal cone with has a hole that's been threaded and the cone nut sit's in a machined out female cone shape and bind's up when it's tight.
