Extrema Ratio anyone?

I've wondered why so few have picked up on the 'separate lock on the primary lock' concept, besides the LAWKS stuff.

Nice review, also.
 
Because a separate secondary lock is a nuisance. I have the MPC and the very similar Nemesis. I never bother with the bolt because the primary lock is more than sufficient.
 
Esav Benyamin said:
Because a separate secondary lock is a nuisance. I have the MPC and the very similar Nemesis. I never bother with the bolt because the primary lock is more than sufficient.
Click to expand...

True, but how does the secondary lock affect lock failure? I'd think the secondary lock would allow a greater load prior to failure.
 
I am a super moderator, not Superman. The primary in this case is massive. Just how much load do you put on a lock? :D
 
i'm italian and know ER quite well. I don't think they are so good, they are expensive and made all (fixed and folder) whit the same (obsolete) steel... the quality isn't so high as they tell (they tell that are used by many italian military forces but this isn't true)

the handle is the same on every knife and i think this is ain't good.
 
Well, atleast the RAO folder that I own is sturdy knife indeed, and I´m pleased the quality of if even though it´s expensive.
 
but the n690co, imho, isn't good for a knife like the rao... i prefer an high carbon steel (or a semi-inox like D2) on a blade whit that size. (The n690co is almost like an 440c)
 
Good review, I had this same model of knife and ended up giving it to my dad, who promptly sold all of his Striders and EDC's it now...I liked the knife all positives are there but the grind angle on the blade makes it more butter knife than slicer had to regrind it and like the magical moderator said, the secondary lock is overkill.
 
oh yes, the er always sharpen the knvies whit a too wide angle... some model in chopping work literally bounce off of wood...
 
/
P1160667.jpg


Great little thing.
 
Esav Benyamin said:
I am a super moderator, not Superman. The primary in this case is massive. Just how much load do you put on a lock? :D
Click to expand...


I own the ER Nemesis, and I agree with Esav here. The primary lock is extremely massive. I'd say it's about 1/4" thick. I dare you find another lockback whose lock is as strong as this one. It really is an overbuilt folder, but I do enjoy its size though. It makes my full size military look really small :D

The force is really thick in this one :eek:
 
beluga said:
I own the ER Nemesis, and I agree with Esav here. The primary lock is extremely massive. I'd say it's about 1/4" thick. I dare you find another lockback whose lock is as strong as this one. It really is an overbuilt folder, but I do enjoy its size though. It makes my full size military look really small :D

The force is really thick in this one :eek:
Click to expand...

I don't know - the Cold Steel Triad locks seem to be pretty strong and I seem to remember a review of an ER that showed that lock engagement wasn't "all it should be".
 
You seem to remember a review. I seem to remember using mine. I'll go with my experience.

One review I saw said the pivot wasn't as strong as it could have been. It's stronger than I am, though. Another review described what may have been a defective lock. That can happen.

The basic mechanism is extremely strong and effective.
 
Well don't want to ruffle any feathers but even if the lock is an inch thick the main thing is that the pivoting pin inside the massive lockbar is actually quite puny. Ultimately the strength of the lock depends on that pin.

I'm saying like imagine a rope which can carry 30 pounds. I cut it but not all the way in anywhere along the length. I reduce the cross-sectional area to half in the cut section meaning it is only 15 pounds strong in that area. By average the strength of the rope is very close to 30 pounds but the real load it could now take is 15 pounds.

It does not matter if the lockbar is 2 inches thick, you just ensure mode of failure is not from the lockbar to blade tang cutoff interface for example that's all. Failure will occur somewhere else effectively reducing the strength.
 
Last edited:
Cotherion said:
Well don't want to ruffle any feathers but even if the lock is an inch thick the main thing is that the pivoting pin inside the massive lockbar is actually quite puny. Ultimately the strength of the lock depends on that pin.

...

Failure will occur somewhere else effectively reducing the strength.
Click to expand...

You do have a point.

However, when I broke a few folding knives (I bought a few pounds of confiscated knives) I noticed that the thickness of the pivot pin bolts seemed more important under side loadings. Which is why I like "big head" pivot fasteners.

Usually the lock or some other fastener would fail before the pivot pin.

I also note that some of the knives were much stronger in resisting closing versus resisting further opening, beyound the normal "open" blade position.

Admittely, the knives I broke were mostly inexpensive knives (or I didn't know the brand, so assumed such).
 
I like large pivot pins (on the blades pivoting point) for resisting lateral force (however depending on the thickness of the blades). I like a large fat stop pin. For lockbacks I like fat pivoting pins (for the lockbar pivot) especially the Tri-ad locks of Cold Steel as a good example. And someother stuff, different for different folder types...

I am particularly concerned about all this that they affect the decision of the blades I buy. I will of course consider the weakest component (or weakest link) so Sometimes my folders have small pivot pins cause the blades are thin. Pointless if the pivot is thick if the blades snap first...
 
Oh yeah, I own a MPC, DO stratofighter, Rao and a little ER folder with plain edge I can't remember the name. I have a little experience so it is not too bad...

I am sure that the Tri-ad lock on my Cold Steel Black Rhino and Rajah 1 is stronger than my MPC.
 
You must log in or register to reply here.
Back
Top