Optimal position of the liner lock

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J. Doyle said:
I'm not sure you know knifemaking, to put it politely.


You ask for input from those with actual experience but don't listen anyway when it actually happens.


Make one by hand start to finish then let us know what it's worth.
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To me, another STUPID design is this Spyderco


Look at this.

1) Big hole close to the pivot of the blade. For plying, of cause the tip will break first, but you still have a useful knife even if 1/2" of the tip broke off. But then the next weak point will be right there. The big hole weaken that part just like the super thin part around the pivot hole that weaken the base of the blade. If the blade breaks here, you have no knife left to use.

2) There is no finger protection. If you use in self defense and thrust. You really risk shoving the blade back and cut your finger seriously.

3) The liner lock is exposed, you can easily move it when you grab the handle for using as tool or in defense situation and unlock the blade.

How is this a good design that worth a lot of money? You want me to learn from a famous designer? You can't go by the price and name. I won't carry this one even if I get PAID to carry.



COMPARE TO THIS MODEST PRICE($68) Steel Will Warbot



None of the problem described above. Look at how robust of the blade around the pivot point area both on blade and liner. Liner is 0.06" thick, blade is 0.14" at the base. It dosen't use ball bearings, no thinning in the pivot hole. Still smooth and easy to deploy.

Both knives are more utility with teeth on the blade for cutting seat belt. Look at the difference on the design. You don't need to be a knife designer to understand all these. This is COMMON SENSE. I hate to sound offensive and ungrateful, but just use common sense. THIS IS NOT FASHION, THESE ARE TOOLS AND FOR LIFE AND DEATH.
 
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I don't know of any folding knives designed for prying. And not every folding knife is designed for self-defense. To judge every folding knife, or a liner lock by such criteria is, quite frankly, ridiculous. Most folding knives, including liner locks, are designed to simply cut stuff. Most are not designed for "LIFE AND DEATH" situations involving levels of force and stress that would cause a properly made liner lock to fail.

The Spyderco knife you Pictured is the Persistence Lightweight with a blade 2.75" long, and it sells for $43 (BladeHQ). Nowhere does Spyderco say that it is designed for prying, or self-defense, or that the lock is designed to survive any life or death situation.

This thread just gets more absurd by the day :rolleyes:.
 
killgar said:
I don't know of any folding knives designed for prying. And not every folding knife is designed for self-defense. To judge every folding knife, or a liner lock by such criteria is, quite frankly, ridiculous. Most folding knives, including liner locks, are designed to simply cut stuff. Most are not designed for "LIFE AND DEATH" situations involving levels of force and stress that would cause a properly made liner lock to fail.

The Spyderco knife you Pictured is the Persistence Lightweight with a blade 2.75" long, and it sells for $43 (BladeHQ). Nowhere does Spyderco say that it is designed for prying, or self-defense, or that the lock is designed to survive any life or death situation.

This thread just gets more absurd by the day :rolleyes:.
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There are a few Spyderco more expensive ones looking like that. I have $20 ones better than that. This is one example, I've seen enough expensive ones.

About the usage of knife, that's my opinion. I guess unless one lives in wilderness might carry for every day use. Most people carry either for utility or self defense. That's one think I never get is treating knives as any other way. If I want to wear things to show, I go for rings, chains etc. Knife, I hide in pocket just for emergency. What are people carrying a knife for? Cutting food or opening envelopes?

I come here to talk engineering and very specific on what I am asking, I got criticized as all knowing. So I just want to expand my observation. If anyone want to talk about engineering and design on the line lock, I am all ears. I just not buy into just because someone had knife design experience, they automatically know all the ins and outs. There's no excuse to design something like what I posted in post #59. Believe me, there are a lot of knives like that. go on youtube and search for knife disassembly and you see a lot.
 
Speaking about utility, if would be so nice to find a multitool knife at least with screw drivers and a blade that can be locked. Don't have to have scissors, pliers type, just basic screw drivers can opener etc.
 
WOW. I've read thru all of this....and basically, it's the same thread the OP started on frame locks when he joined last fall...

I think it's abundantly clear that OP is NOT seeking advice because he is not listening to people like John who ACTUALLY make folding knives.

It's also interesting to me that someone who says he is an engineer and says how simple all this is for him complains about "a lot of reading" in the useful links posted. Also OP seems to have difficulty expressing pretty simple concepts coherently. Finally, the "life or death", "critical self defense" stuff reads like mall ninja - any blade intensive martial art uses FIXED blades, for obvious reasons.

Alan - I don't say any of this to demean you, but being foolishly argumentative while simultaneously saying you're a novice, humble bragging about cars and education is NOT the best way to get help from people who actually know what they are doing. May I suggest, as others have, that you make a folding knife from start to finish using whatever "engineering" you think best....post pictures....and then perhaps do a "pass around" so others can actually handle the knife and give you input

Bill
 
I might also mention that Leatherman and many other manufacturers make multitools with locking blades....
 
alan0354 said:
would be so nice to find a multitool knife at least with screw drivers and a blade that can be locked. Don't have to have scissors, pliers type, just basic screw drivers can opener etc.
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The Milwaukee Fastback has a couple of variations with a 1/4" bit driver that folds out from the back of the handle. You can get it as a liner locking combo edge knife or a utility knife with replaceable blades.
 
Look at your original photo of the three different positions. The first thing I see is the only lockbar that is straight when engaged is the original one. It appears that the other two have a slight curve now, which means they are going to be weaker than the original. Kinda like how they don’t typically build curved skyscrapers but go with the straight ones. I also want my lockbar to travel in further for some reason, but then I realize it’s the way it is for a reason. The knife makers thought about it before you.
 
billf said:
WOW. I've read thru all of this....and basically, it's the same thread the OP started on frame locks when he joined last fall...

I think it's abundantly clear that OP is NOT seeking advice because he is not listening to people like John who ACTUALLY make folding knives.

It's also interesting to me that someone who says he is an engineer and says how simple all this is for him complains about "a lot of reading" in the useful links posted. Also OP seems to have difficulty expressing pretty simple concepts coherently. Finally, the "life or death", "critical self defense" stuff reads like mall ninja - any blade intensive martial art uses FIXED blades, for obvious reasons.

Alan - I don't say any of this to demean you, but being foolishly argumentative while simultaneously saying you're a novice, humble bragging about cars and education is NOT the best way to get help from people who actually know what they are doing. May I suggest, as others have, that you make a folding knife from start to finish using whatever "engineering" you think best....post pictures....and then perhaps do a "pass around" so others can actually handle the knife and give you input

Bill
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I think I got a good idea here now. I thought this is maintenance and tinkering section that is supposedly for modification, where people talk about modification and reasoning. All I got when I ask and challenge is "you don't know nothing, there is a good reason for why designer doing this and they are right".

I would expect people give reason like Blue Sky in post#23 and Tokerblue in post#44 that gave description which is very helpful, that we can actually talk. But instead I mostly get this responses. I think I gave good examples why I do NOT take all "knife designers" that serious in post#60 and #61. That was stupid design particular Spyderco. I guess it's their "unique Spyderco" characteristics and a lot of the expensive model are like this.

I think I got a pretty good idea from Blue Sky and Tokerblue's discussion that answer my concern. It's very simple stuff. The rest is just responding to comments.
 
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Danke42 said:
I just want to say I love your MS Paintish engineering drawings. Most people wouldn't share those.
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At least I show what I am doing, not just talk. These stuff is so so primitive it's HS physics.

At least I don't brag about designing a knife looking like a chicken head with big eye like Spyderco and claim as designer.
 
alan0354 said:
At least I show what I am doing, not just talk. These stuff is so so primitive it's HS physics.

At least I don't brag about designing a knife looking like a chicken head with big eye like Spyderco and claim as designer.
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Posts like these (and for the record those found in your previous thread that was mentioned) are why people aren’t engaging with you or taking you very seriously.

You have very thinly veiled your agenda, and erroneously attacked one of the most respected makers in all of Knifedom. Which by the way, Mr Glasser is so well respected and his designs so highly regarded because they have been used the world over in a variety of applications - they are time tested without question.
 
BTTLBRN said:
Posts like these (and for the record those found in your previous thread that was mentioned) are why people aren’t engaging with you or taking you very seriously.

You have very thinly veiled your agenda, and erroneously attacked one of the most respected makers in all of Knifedom. Which by the way, Mr Glasser is so well respected and his designs so highly regarded because they have been used the world over in a variety of applications - they are time tested without question.
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I am attacking others? People are attacking me, so I have to show how dumb some famous designed knives are.

Anyway, I think it's a mistake to even talk here, people are not technical. Most just say " they have experience designing knives, you should just listen" instead of actually get into the angle, friction.
 
alan0354 said:
I am not claiming to be smart,
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Of course you are.

alan0354 said:
I said a lot of them are DUMB.
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This very statement more than implies that you view yourself as being smarter than they are.


alan0354 said:
I am attacking others? People are attacking me, so I have to show how dumb some famous designed knives are.
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Quoted for posterity, in case you somehow realize how embarrassing it is be that you said this.

alan0354 said:
Anyway, I think it's a mistake to even talk
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Yeah.
 
David Mary said:
Of course you are.



This very statement more than implies that you view yourself as being smarter than they are.




Quoted for posterity, in case you somehow realize how embarrassing it is be that you said this.



Yeah.
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You want to change my mind, go back to the beginning of this thread, actually talk about those conditions and explain why one is better than the other one in terms of physics. This is engineering and so far only Blue Sky in post#23 and Tokerblue in post#44 actually analyze it. You try to convince me just because one design knives, they know? I think the designers should be embarrassed designing knives like I posted in #60 and #61. Those are big names.
 
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