Question: Framelock lock face

It's fine. This is why I don't understand why people think that frame locks are sooooo much stronger than liner locks. The contact patches are almost exactly the same. If the contact patch was truly 100% the lock stick would be so horrific it would never unlock.

That sebenza posted, I bet if it was disassembled and you inspected the lockface, you would see it's still only making one small point of contact.
 
I looked up the Bob Terzuola book and found some description about the lock face contact.
According to it, there are three possible scenarios.


Lock_contact.JPG


The illustration kinda shows the contact zone from the top.


The middle is what he recommends.
The lock bar should contact the blade at the front and over only 0.1 inch toward the back.

The left one is what my Tolk looks like.

Tolk_lock.JPG


The difference is that in the middle, the lock bar face is adjusted to allow the entire front side of the lock bar contacts with the blade tang.
In contrast, the face of the lock bar is left flat in the left scenario.
He mentions in the book that this type of contact may become sticky when soft titanium is used for the lock bar.
I am almost certain that the tang of the lock bar of Tolk is hardened, so this is not an issue with it.

The right most panel is the full contact of the two faces.
It is written in the book that this may cause the blade to rock.
But, If this is what the integral lock looks like in Sebenza, I guess it has been proven that, with the tight tolerances, this configuration works, too.


Miso
 
Sebenzas "contact at the front side" (middle of illustration). You can tell by looking at the tang while the blade is closed, it will be shiny due to lock bar rub. "Contact at front corner" will wear much quicker due to small area of contact.
 
JoHnYKwSt said:
Sebenzas "contact at the front side" (middle of illustration). You can tell by looking at the tang while the blade is closed, it will be shiny due to lock bar rub. "Contact at front corner" will wear much quicker due to small area of contact.
Click to expand...

Thanks for the info.
That makes sense.


Miso
 
I found a nice video by John Grimsmo talking about the lock contact and how to carbidize the lock face.
[Youtube]n2h8ctYju8[/Youtube]

He mentioned that the contact should be at the front inner corner of the lock bar.
Anyway, very informative video.

I also learned recently that the lock bar of Tolk is carbidized, but not heat treated, as well.


Miso
 
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