Umnumzaan fails spine whack? (not my vid)

M

Mugen

Joined
Jun 9, 2005
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98
While researching my next possible purchase i came across this video on youtube:

http://www.youtube.com/watch?v=9OzqR5HFp2o

Is it possible the ceramic ball makes the blade more prone to close, since the contact area of the lockbar to the face of the blade is smaller? I've never held or seen an Umnum up close so thats just speculation. It doesnt seem to be an issue in another vid of the same author on youtube when he uses it to penetrate metal and no shock is involved. He has some great vids to watch nevertheless. Discuss?
 
There is a whole other thread on this in the Chris Reeves forum. That knife went through hell before the spine whack. The guy stabbed a fridge with it and then some.
 
I had a similar issue with my umnumzaan. If I opend it softly the lock would slide but still close because the ball would roll. I just made sure to open it with a little force. Not a big issue.
 
That's not fair that the person who posted the video did not state the history of use of the knife.
 
If you buy an Umnumzaan and the lock fails under normal use, I'm sure CRK would quickly fix or replace it.
 
that guys a real a**. he posts that video and doesnt talk or mention in any way, shape or form that that poor knife has been through hell and back. that's extremely misleading and dishonest period.
 
Watching him stab it through the refrigerator has changed my mind about s30v not being tough enough for a fixed blade.
 
Jpalmer1988 said:
Watching him stab it through the refrigerator has changed my mind about s30v not being tough enough for a fixed blade.
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A-why? what in that video in any way, shape, or form says that S30V didn't pass his BS test? nothing. it didn't break or chip, and it stabbed right through:confused:

B-how much fridge stabbing were you planning on doing with your fixed blade??? your right, S30V isn't the best steel for fridge, stabbing fixed blades. you need something like 110V. now THAT'S a fridge stabbing steel:rolleyes:

i really hope your being sarcastic
 
nate3993 said:
that guys a real a**. he posts that video and doesnt talk or mention in any way, shape or form that that poor knife has been through hell and back. that's extremely misleading and dishonest period.
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just click on 'more from diabelek999'
 
nate3993 said:
A-why? what in that video in any way, shape, or form says that S30V didn't pass his BS test? nothing. it didn't break or chip, and it stabbed right through:confused:

B-how much fridge stabbing were you planning on doing with your fixed blade??? your right, S30V isn't the best steel for fridge, stabbing fixed blades. you need something like 110V. now THAT'S a fridge stabbing steel:rolleyes:

i really hope your being sarcastic
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Uh, he's saying that he used to think S30v wasn't tough enough, but now believes it is good enough after watching the video.
 
mongomondo said:
Uh, he's saying that he used to think S30v wasn't tough enough, but now believes it is good enough after watching the video.
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Right on the money. I'd always heard about problems with s30v fixed blades but never had first hand experience. I think that helped enough to push me over the edge on a Crk Pacific.
 
creativeoutlethobbie said:
There is a whole other thread on this in the Chris Reeves forum. That knife went through hell before the spine whack. The guy stabbed a fridge with it and then some.
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Here's the earlier thread on the Chris Reeve forum: umnum test from poland at http://www.bladeforums.com/forums/showthread.php?t=703535

Please be aware that test was preliminary data. Posters from the Polish website joined in to say it was not supposed to be published until they analyzed the data and contacted the Reeves about it. Anne Reeve joined the discussion to say they studied the video but needed the knife itself to determine what happened.

It's just not worth getting worked up about this until based on insufficient data, as even the testers agree.
 
Jpalmer1988 said:
Right on the money. I'd always heard about problems with s30v fixed blades but never had first hand experience. I think that helped enough to push me over the edge on a Crk Pacific.
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oh my god. i am sooooo sorry. i didnt see the not. i thought u were saying something totally different. my deepest apologies. :thumbup:
 
eygen said:
But you don't want to get your finger between it if it's faulty, do you?
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Actually I had a lockback fail, and I know exactly what it feels like. I still do, every day.

How does a spine whack, in any way, emulate a the movement of a knife in a human hand?

Do you often cut super fast, against a hard surface, with the back of the blade?

How does this actually test the lock while in "normal" use?
 
As usual, I'm with Esav. The video demonstrates nothing, and like most things, isn't worth getting worked up about. CRK is one of the best knife companies on earth, which also means it takes an unusual amount of scrutiny. Over time, you sort of get used to it.

Responding to the OP directly, I'm fairly certain that the knife's performance has nothing to do with the area of the mating surfaces. Reeve knows what he's doing better than we do. Plus, I was reading Bob Terzuola's book the other day - indisuputably the best knifemaking book I've read - and he actually recommends rounding the surfaces on both the tang and the lockbar - it reduces the mating surface area, similar to that of the Umnumzaan, but apparently it makes the lock more effective.
 
steelhog said:
I had a similar issue with my umnumzaan. If I opend it softly the lock would slide but still close because the ball would roll. I just made sure to open it with a little force. Not a big issue.
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My umnumzaan is the same way. If I open it very softly, even though it locks, it still will close if forced. Upon looking very closely at the knife, when you open it softly, the poly rings compress slightly and you will see the lockbar engage about 25% give or take a little. If you open the knife more forceful, like your expected too, the washers compress fully and the lockbar engages aprox. 60%. If you hit the spine, it will sometimes close with the lockbar locked in that 25% range. If locked fully open and it locked in the 60% range, the blade will not budge. To me, any framelock is prone to fail if in a 25% lock engaged range. I noticed while studying this that if you Cut Anything with the umnumzaan in the 25% lock position, the pressure of the cut fully compresses the poly ringe and the lock engages the full 60%......... This can be avoided by Knowing your tools/knives/ etc. This is maybe the Only area where I think the sebenza edges the umnumzaan. The sebbie has that audible "click" and you know its open. I also feel the sebbie has a larger lock engagement area, while the umnumzaan just has the face of the ball which is pretty much like a needle point. But if you open the umnumzaan with the quick thumb flick using the thumb stud ( NOT Wrist Flicking guys ) like you do on the sebbie, you will hear a little louder click, not like the sebbie, but its louder. Upon looking at the knife when opening it like I would a sebbie, its Always fully locked at 60%. If I were to stab a fridge, I think I would rather have my large regular sebbie instead of my umnumzaan just because of the larger locking surface. But since I am not going to go around and stab fridges, I dont have to worry about it. The umnumzaan is a great knife and I take my CRK hat off to Mr. Reeve for a great design. This all comes down to knowing and understanding your tools. In the end, ever since I got my umnumzaan, it has been in my pocket. I cant put it down and use it Everytime I wanna cut something. Awsome Knife !!!

I thought the vids were pretty cool. They put the umnumzaan through hell and it performed great.
 
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