New Lock Design

My apologies Arlee. I thought you said you were seeking an "honest test for strength".

We don't want you to advertise that "Spyderco said" blah blah. We have done this in the past and the numbers were distorted and made public, with Spyderco's name.

We provide this service to any knife maker or factory in the interest of helping them improve their locks. The $25 fee is a break even cost of doing the test.

BTW Joe, reliability is also demonstrated in the breaking test because the lock, when stressed, will often defeat before it breaks if the engineering or geometry is not sound. This is not as good a test as cycling, "thumping" or finding experts, but is revealing.

Arlee, regarding reliability, I would suggest that you do use an expert. We haver found that some people have the ability to find the flaw in a lock design. From my experience, I would recommend Cliff Stamp, Joe Talmadge, Dexter Ewing or Michael Janich as some that we have found capable in that area.

sal
 
Sal Glesser :


... reliability is also demonstrated in the breaking test
Click to expand...

In the sense that it is used here on Bladeforums, reliability means unlocking accidently due to the chaotic way in which your hand applies forces to a knife in use which isn't well represented by slow vertical loads.

You could look at loads applied at an angle as well as twists. For example if a blade broke at 1000 in.lbs in a vertical load, but only 100 in.lbs with a load applied at a 45 degree angle, or 50 in.lbs after a 20 degree horizontal rotation that is rather telling is it not?

Consider specifically, that even though the Strider/Buck is *very* strong in a vertial break test, I could break the liner quite easily by twisting the handle before applying a load. The twist moved the liner and caused it to come out off full engangment and thus when the load was applied the shear stress was magnified many times over and the lock bar fractured at the interface.

Also consider impacts. I was able to completely destroy a SOG Arc-Lock folder, another one that claimed a *very* high strength, by light baton work. The impact shock and possibly vibrations caused the mechanism to literally exploded with the knife coming apart in pieces. This you could look at easily in a rigerous way as well with a very simple set up.

As always, regardless of the hype that came out of the lock testing, and this was considerable, this wasn't the fault of Spyderco, and your work on lock strength had made a very valuable additional to the body of knowledge on knife locks and is appreciated by many knife users.

In regards to the lock testing suggestion, Joe has a very wide body of knowledge on knife locks and considerable experience in use and evaluation. His opinion would be of considerable value to many in the knife community.

-Cliff
 
Hello A.R. Niemi,

If we are talking about the same knife, I almost bought one of your prototypes from the last Portland, OR gun show for $300. Is that the one with a certification letter from you?
Very cool knife, with good workmanship.

WHO
 
Who

Not knowing who you are I can't say for sure?The price sounds about right though.I was with my brother(I'm the fat one)we only had one kind of knife on the table it has a leaver and black G-10 textured
scales the name of the knife is MAGALADON sounds like MEGA-LA-DON.
The biggest(toothed)preditor to ever swim,thought to be related to the great white shark (jaws) by most paleontologists.
Any way if it was you thanks for the kind words(checks in the mail).

Arlee Niemi
centerlocknives@crpud.net
 
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