Frame Lock Geometry question

[NSW1535@Gmail.com]

Hey guys. If I'm not mistaking, I heard that the blade tang on a frame lock should be cut at around 8 degrees. Any idea why the blade is always cut and not the frame to 8 degrees? What do you think would happen if both blade and frame where cut at 4 degrees? Any ideas, comments?

 

[N Gremory]

The blade is cut so that when the lock bar on the frame begins to wear out, it will just move farther and catch on an area that has less cut away.
This increases the amount of time that the locking mechanism works. Once it wears out after locking up at 100%, you'll see blade play and the lock will no longer work as intended.

Also, the lock bar bends. When not cut, it's already at an angle. I believe that if you cut the lock bar instead of the blade tang, you would see an incredibly short life for your locking mechanism.
I believe that only the tang being cut to an angle would be optimal in lock life.