Benchmade 275 adamas lock strength test

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nick_30

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Aug 21, 2011
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Just wondering, I just watched the benchmade axis lock on the adamas testing and it showed Max force of 1717 inch pounds of force before it failed. They claim its lock strength at 800lbs of force. If my math is correct, that is only 143ftlbs of force. So how are they coming up with 800lbs?
 
nick_30 said:
Just wondering, I just watched the benchmade axis lock on the adamas testing and it showed Max force of 1717 inch pounds of force before it failed. They claim its lock strength at 800lbs of force. If my math is correct, that is only 143ftlbs of force. So how are they coming up with 800lbs?
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Probably it withstood 800lbs about 2 and some fraction inches from the pivot. It's why any claims about poundage and not inch pounds or foot pounds isn't worth paying much attention to.

Basically, people don't have a great understanding of units of force vs units of weight, so they use the one that sounds impressive and people will get.

The actual poundage will obviously change based on how close the weight is to the pivot, so using weight is, at best, imprecise and, at worst, deceptive.
 
That's what I figured, the test had the forces applied at the back of the handle so obviously, at 2" from the near the pivot, its strength will increase a great deal. Always use the biggest numbers because the public is dumb right;):D
 
Read your post incorrectly. Numbers or claims w/o exact details and specifics they're meaningless.
 
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Well, most folks here don't want a book on the subject...but a little bit of explanation would please most of us...
 
nick_30 said:
That's what I figured, the test had the forces applied at the back of the handle so obviously, at 2" from the near the pivot, its strength will increase a great deal. Always use the biggest numbers because the public is dumb right;):D
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Ugh. And to demonstrate that I'm not any smarter than the public I referenced units of force and not torque. :oops:
 
Gideons said:
No, your math isn't correct. Frankly I really don't feel like getting into the physics of the experiment, or what the numbers truly represent. But, I will summarize by saying you cannnot just extrapolate results by dividing by the overall length of the knife.
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Ummm, he divided by 12. 12 inches to a foot and all that. OAL of the knife doesn't seem to have factored into his post at all...
 
I don't see how overall length of the knife would determine its lock strength at all. The force applied was just that, the force applied to the handle from the fixed point. If their readings are true at 1717 inch pounds, then you take the inch pounds and divide by 12 to get the foot pounds. So you end up with 143ftlb. Wouldn't that be the same as hanging 143lb from the knife. I dont think it would because the zt0301 belt 270 something before it failed and I believe the 275 is stronger. Overall length of the knife has nothing to do with the stresses at the points of stress which is the axis lock and the pivot. Maybe I'm missing something.
I'm just curious how they got the 800lb rating from the test they showed, I mean, I believe it because the 275 is a tank, I am trying to figure out the process more for my mind. It helps me understand a more variety of things in the future
Btw....I was just messing around with the other post, I wasn't insinuating anything
 
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Sonnydaze said:
Well, most folks here don't want a book on the subject...but a little bit of explanation would please most of us...
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Ahhh yes, but I am that 1% that wants to know exactly why and how things work and act the way they do. Teachers hated it....:rolleyes:
 
nick_30 said:
I don't see how overall length of the knife would determine its lock strength at all. The force applied was just that, the force applied to the handle from the fixed point. If their readings are true at 1717 inch pounds, then you take the inch pounds and divide by 12 to get the foot pounds. So you end up with 143ftlb. Wouldn't that be the same as hanging 143lb from the knife. I dont think it would because the zt0301 belt 270 something before it failed and I believe the 275 is stronger. Overall length of the knife has nothing to do with the stresses at the points of stress which is the axis lock and the pivot. Maybe I'm missing something.
I'm just curious how they got the 800lb rating from the test they showed, I mean, I believe it because the 275 is a tank, I am trying to figure out the process more for my mind. It helps me understand a more variety of things in the future
Btw....I was just messing around with the other post, I wasn't insinuating anything
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The reason it depends how far down the handle the weight is put is because of leverage. The further from the pivot the more leverage.
 
This is disappointing, as we all know the main reason to get a modern locking folding knife is to use it as a freeweight storage method.

I can’t even begin to tell you how often I’ve come across 200lbs of weights just lying there not being suspended by anything, and been glad I was able to clamp the blade of my Recon 1 in a nearby vise so I could just hang the weights on the handle with my handy EDC chain.

That I can trust a knife for everyday tasks like that is very important to me - You know, like when you’re whittling and someone comes by and hits the spine of your blade with a sledgehammer.
 
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Comeuppance said:
This is disappointing, as we all know the main reason to get a modern locking folding knife is to use it as a freeweight storage method.

I can’t even begin to tell you how often I’ve come across 200lbs of weights just lying there not being suspended by anything, and been glad I was able to clamp the blade of my Recon 1 in a nearby vise so I could just hang the weights on the handle with my handy EDC chain.

That I can trust a knife for everyday tasks like that is very important to me - You know, like when you’re whittling and someone comes by and hits the spine of your blade with a sledgehammer.
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:D:D:D...bahahaha, I dont care about hanging weights from my knives either. I was more trying to figure out the mathematics of how they were coming up with their figures, that's all
 
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