amount of lock-up

[jonesjp@surry.net]

I've taken these as close to perpendicular as I can. Is this too much lock-up for a classic?

 

[fishtale]

that looks exactly like my small classic.

 

[Esav Benyamin]

How does it lock up? is it tight, no slipping? Then it's fine. Both my large regular Sebenzas cover most of the tang. They engage with a snap, hold firmly, and disengage only when I deliberately disengage the lock.

 

[DaveH]

looks ok to me.

 

[rolexkid]

to me looks about 90%, a tad to much for me.never had one like that. just bought a small 21, looks like the perfect 75%.

 

[Haze]

Frame locks should be fine all the way up to 100% as long as its still locking up with no play or slipping.

 

[jonesjp@surry.net]

Rolexkid, can you post a picture of your 21's lockup?

I assumed that more lockup was better, and am trying to understand why that isn't so. I'm not talking about my knife in particular now; it locks up with authority and snap, unlocks without drag or too much effort, and stays locked positively, which seems like the proper responses of a knife lock.How is it that a knife can lock up too much? What are the symptoms/results?

I am curious, too, about how CRK would fix a knife that was locking up too much.... (just writing that sounds strange too me).

 

[KeithAM]

The sticky says spec for a new Sebenza is 50-75%. Yours may be a bit over that but I really wouldn't worry about it at all. As far as I'm concerned, more engagement = more secure lock.

 

[din]

I'm pretty sure you busted it, and that it can't be fixed. but because I'm a giving guy, I'll tell you what I'm gonna do. you send me your irreparably broken sebbie, and I'll send you a nice vic cadet. deal?

 

[Haze]

Rolexkid, can you post a picture of your 21's lockup?

I assumed that more lockup was better, and am trying to understand why that isn't so. I'm not talking about my knife in particular now; it locks up with authority and snap, unlocks without drag or too much effort, and stays locked positively, which seems like the proper responses of a knife lock.How is it that a knife can lock up too much? What are the symptoms/results?

I am curious, too, about how CRK would fix a knife that was locking up too much.... (just writing that sounds strange too me).

When your lock bar starts hitting the other handle slab this will mean there has been enough wear to the lock face for there to be a "gap" forming. This will mean you start to get play in the blade and the lock up is no longer sound.
Its not actually the whole lock face contacting the blade tang. you should only have contact at the bottom of the blade tang (the bit closest to you in your pics or firthest away from the stop pin.)

Its the stop pin and the lock bar together that hold the blade in place. The lock bar is the softest of the three (blade tang, stop pin and lock bar) so will wear faster.

When/if it finaly wears out you do have options for fixing it but that will be up to CRK I think.

:thumbup:

 

[jonesjp@surry.net]

I'm pretty sure you busted it, and that it can't be fixed. but because I'm a giving guy, I'll tell you what I'm gonna do. you send me your irreparably broken sebbie, and I'll send you a nice vic cadet. deal?

(Sniff) People really are nice if you just give them a chance to be.

 

[DaveH]

Its not actually the whole lock face contacting the blade tang. you should only have contact at the bottom of the blade tang

Hmm, can you cite this? it kinda sounds like a bit of strider misinformation.

 

[u812]

CRK say up to 75 % is OK.
IMO 25% is perfect.

 

[Haze]

Hmm, can you cite this? it kinda sounds like a bit of strider misinformation.

Not sure about the strider thing, iv never really been big on their knives so i wouldnt know what they have to say

It was discussed at length on the emerson forum a while ago but i cant find the thread. STR gave a good description of what was what.

I have never had a liner or frame lock that had the full face of the lock sit on the blade tang. There has always been a contact spot. As i understood it that was what was wanted in such a set up. I have never heard different.

I could provide pictures but im sure you have liner or frame lock knives you can look at in person to see for your self.
Il see what i can dig up tomorrow, its late o'colck for me here now.

:thumbup:

 

[DaveH]

ok, my question i guess is why would point contact be desired above full contact.

My recollection was there was a strider thread where STR commented.

 

[redsst]

What about the new Umzaan? If I read the descriptions correctly, only a ball-bearing (or two) on the top of the lockbar touches the tang. That would be just a small, single point of contact.

 

[Fooj]

What about the new Umzaan? If I read the descriptions correctly, only a ball-bearing (or two) on the top of the lockbar touches the tang. That would be just a small, single point of contact.

The ceramic ball / blade interface is an impressive evolution of the integral lock -- lock wear concerns are eliminated. Of course, this is pretty much FUD with Sebenzas anyway, since CRK heat treats lock bars to eliminate lock wear anyway. I've EDC the same Sebenza for 12 years, and the lock-up point hasn't moved a bit.

 

[tsiloics]

The ceramic ball / blade interface is an impressive evolution of the integral lock -- lock wear concerns are eliminated. Of course, this is pretty much FUD with Sebenzas anyway, since CRK heat treats lock bars to eliminate lock wear anyway. I've EDC the same Sebenza for 12 years, and the lock-up point hasn't moved a bit.

I agree, although more like 9 years in my case.

When I first looked at the 'Benza, something on the order of 60% seemed like an ideal amount of lap at the tang. After living with one of these things... actually 4 of them, for a while, I'm liking the 75-80% more and more. I mean, how many molecules do you think are being removed from the end of that lock bar every time it's actuated? For crying out loud, it will take an eternity for it to move inboard, as long as it is properly mated to the tang.

The lock is definitely more secure if it sets a little further inboard.

 

[mongomondo]

The ceramic ball / blade interface is an impressive evolution of the integral lock -- lock wear concerns are eliminated. Of course, this is pretty much FUD with Sebenzas anyway, since CRK heat treats lock bars to eliminate lock wear anyway. I've EDC the same Sebenza for 12 years, and the lock-up point hasn't moved a bit.

12 years? Now that is impressive. Have you ever sent it back to be refurbished?

 

[Fooj]

12 years? Now that is impressive. Have you ever sent it back to be refurbished?

My EDC large regular Sebenza's been in several times:

1) Started as a plain, serial # 63, but ~ 1 yr later, had Lisa do a unique handle slab for it, and I swapped the decorated slab out for the original.

2) Had double thumb studs installed.

3) Countless courtesy sharpenings.

None of the above involved lock adjustment.

Fooj