That thought had also crossed my mind as well, but then I remember hearing someone say that Spyderco can engineer any lock to be as strong as they want. There's just a tradeoff. As noted above, the deeper the lockbar sits into the notch, the more difficult it is to disengage.David Lowry wrote:Hey folks,
I didn't want to 'hi-jack' JT's thread on the Torn Apart Native 5 so I created this thread to ask a question.
In JT's thread and a few others that I remember seeing, it seems that there is not much "meat" touching inside Spyderco's lock backs. What I mean is the parts of metal that over-lap when the knife is locked up.
I remember seeing pictures of the inside of Cold Steel knives and they have huge amounts of 'meat' over-lapping.
I'm not digging on Spyderco at all, I just wonder if you need a ton of over-lap or not? I don't know but to me it always seems like the more the better when talking about lockup.
This is not always the case. One lock can be overbuild 3x and another 5x. Also strength depend on type of the steel and h/t procedure.David Lowry wrote:I don't know but to me it always seems like the more the better when talking about lockup.
I believe that Sal is engineer as well.The Mastiff wrote:I don't know anything about Sal's formal education but he is extremely knowledgeable as a knifemaker and designer. He worked with and learned from some that are rightfully called legends themselves.
Eric is a formally trained engineer IIRC, in addition to the experience he has in the knife industry.
Hiring brains, and good ones, equals, surpasses and augments one's own good qualities and helps assure quality too. It also leaves time for the other needs in the equation. While interesting, the Cold Steel hype about the strength of their locks and knife lockup is not much scientific. (But, man, can they ever beat up their products!)sal wrote:Hi Dave,
Breaking the knives does disclose interesting information. Not often what you'd think.
I have had some engineering training, as does Eric, but neither of us are formally trained engineers. However, we do have really good engineering crew.
-er, me, by way of Tyrion LannisterI drink, and I cut things.
Over Strikes will kill most lock backs in a VERY short time, VERY short time so if you ever want to ruin a lock back do some over strikes. They are MUCH worse and MUCH harder on the lock than spine hits. I started doing over strikes back in the late 70's when testing knives back then. I never met a lock back that could take it for very long.defenestrate wrote:Looking at those pics, the Cold Steel model is beefed up mostly in the area that would take force if you were whacking the knife on the spine all the time. Furthermore, that are looks rather fatigued on that knife, while the area by the stop pin does not show the same. The model shows light contact wear from regular use, and almost none in the area where spine whacking would show it. Most users on here consider spine whacking to be abuse. So if you're looking for a knife to be used as a blunt battering object, Cold Steel folders offer that in spades. But for use as a regular knife, I think you will find the ergos and materials in Spyderco knives to be superior on the whole, as I do.
The Buck 112 was the very 1st folder I broke in testing doing over strikes back in 1978.LAB wrote:Take apart a Buck 110 and you will see the same thing. It is characteristic of the lock back/back lock design.
I think Solid has the answer here (and Donut): the width, rather than the depth of the locking lug, is what keeps the blade open for normal knife use. If the knife is being hammered on the spine so that the lock lug may be popping up and down, then the depth of the lug comes into play. Since I don't spine-whack my folding knives, the depth of engagement is of little import to me.SolidState wrote:The force generated on parts other than the pivot pin are generally done so radially from that pin, or radially toward the lockbar on the top interface (which both are roughly the same thickness in the necessary dimension for proper blade-pressure application.