Benchmade 275 adamas lock strength test

Well, I don't use my folders for hanging weights, but a strong lock is handy when jamming the blade into cracks in granite cliff faces so you can stand on the handle. (This is also useful when scaling skyscrapers.)
 
nick_30 said:
Yea, I know, I have been thinking about one but most of the time I only have one hand free at the time of need
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The break in can be painful . Once worked-in , you should easily be able to use one handed .
 
Unless you’re giving the knife to The Rock or something, I wouldn’t worry about it. I can’t remember the last time I exerted that much force on any knife and plowed through the locking mechanism :p:p:p
 
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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Couple things here.

Inch pounds/foot pounds are units of torque, generally speaking, or in this instance as what an engineer might refer to as units of applied bending moment. You can't compare them to units of force (pounds) because that comparison is meaningless. It's like comparing pounds of force to pressure in pounds per square inch; they're related concepts but not directly convertible.

When Benchmade says their lock withstands 1717 inch pounds of torque/bending moment, that figure can be thought of as 143 foot pounds. This means the bending moment at the pivot is equivalent to one pound of force applied at the end of a 143 foot lever, or of 143 pounds of force applied at the end of a 1 foot lever (both are identical, at least from a moment perspective).

Depending on how far from the pivot Benchmade applied the load during testing, the force required to achieve that applied moment will be different. It was a little over 2 inches from the pivot, so the force was about 800 pounds.
 
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