Doh! Help me with my BM 581 axis

Matthewd

Matthewd

Chief Gadget Officer
Joined
Aug 25, 2011
Messages
389
So it's my nature to take things apart and put them back together....
I have a pretty solid engineering mind, so I'm good at this.
My 581 is a spring assisted opener.
It is now, unfortunately, a spring opener without requiring assistance (doh!)

Basicaly, on these models once you get them 70% closed, there is usually then some back tension that "sucks" the blade back into the handle.
Again, when opening, you must normally open past about 30% before the spring engages....

This is no longer the case, and it wants to fly open when touching the axis lock -
What am I missing here?

(and, no, I do not want this to be an auto....)

Thanks,
Matt
 
OK after some more examining, it appears that there is a groove to house a ball bearing that would serve to disengage the spring from it's primary slot in the blade allowing an additional appx 20% travel with no spring load. I am now scouring my floor for a bb. Can anyone confirm that this mechanism operates this way?

Thanks,
Matt
 
All fixed - there is no ball.
The thumbstuds and stop bar must be removed, and the knife must be re assembled with the blade opened to 30% beyond the stop. This sets the spring in the correct slot for engagement, disengagement.
The good news is that I got to play with my knife for a while as a manual opener as well.
I like it, but I can't decide if I prefer the manual or the assisted...
 
lol - no problem. I spent about 10 minutes crawling on my hands and knees looking for a non existent bb....
:p :)
 
I have had that exact problem myself. It happens when the "free end," i.e. the non liner end, of the assist spring slips out of the deepest notch on the blade and instead get caught up on something. The solution is somewhat non-obvious. First, you need to disassemble the knife. The trick to the whole thing is to take the thumbstuds off the knife. This allows you to put the blade past the vertical, otherwise the studs will hit the liners. I would say the blade needs to be twenty or so degrees past what would be the open position. This allows the "free end" of assist spring to fit into the deepest part of the notch on the blade and keeps tension off the spring. However, this positioning will prevent you from putting in the stop pin and the shim, so you have to put those in later. So reassemble the knife with the blade still past the vertical, when you put in the pivot screw really tighten it down. In fact I like to keep it tight enough that the blade cannot move, and then when I need to move the blade back to put in the shim and the stop pin I loosen it as little as I can. This should keep the assist spring in its proper position. I only adjust the pivot when the knife is almost completely back together.

Opps, I didn't see your post.
 
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