Question about liner on my BM

one2gofst

one2gofst

Joined
Dec 3, 2001
Messages
1,536
I have owned my BM 910 HS for about 2 and a half months. It has been used regularly and fondled frequently (opened/closed, etc). my question is this, where should the liner engage the blade? Mine is engaging about 3/4 of the way across the blade. I don't know if it started off like this or has moved over since I got it. Is this bad/dangerous? If so, is there anything I can do or should Isend it back to BM? Thanks in advance for any help you can offer.
 
Blade is nice and tight, no play vertical or horizontal. Only reason I asked is that people talk about the liner being on the near side of the blade but being fully engaged (seems to be preferable) and the pic of the used AFCK on the trade forum locked up shallow.
 
one2gofst, where in Missouri are you? I am in Springfield. Always nice to see a fellow Missourian here. Believe it or not, there are 6 or more of us. Drop me a line sometime, if you want to chat knives.
magician@kidmagic.net
 
Liner locks tend to engage at various points along the back of the tang. As long as it's not slamming into the opposite liner, it's going to be considered "normal". As alelser stated, if the blade does not exhibit any "play", I wouldn't worry about it.
 
if you were to look very closely..you will see that the butt end
of your blade where the linerlock touches it..is not straight across,
but in fact has a slight angled appearance to it... it is
cut that way on purpose...so that the lock can engage where it best
faces up to the blade..the lock arm will slide right untill it
stops at the point where it meets the most resistance..and as minute
wear occours..it will continue to slide right..untill it gets to the
far right edge..and begins past it..its doing exactly what it was
designed to do...be self adjusting..however..a new knife shouldnt really lockup much more than half to 2/3rds way across..any more than
that..its time for a warrently repair... hope this helps you understand your issue a bit better. darkman
 
If it is far enough over so that the ball-detent is actually touching the large washer on the knife it is bad. On most BM linerlocks it iwll eventually wear over to this point, or to hitting the opposite scale. It has happened on on of my mini-afcks, and 800. When this happened to the two knives it was from wear. I tested the lock on the mini when I found out that the ball-detent was actually engaging the other washer. I disassembled and messed around with turning the top bar so it would maybe line up different but to no avail. I have assembled/dissasembled almost every liner-lock knife I own, they are amazingly simple.

So I opened the blade and lock it. The push downwards on the blade and the liner moves over to the other edge of the blade. This is bad. And under very light pressure too. It doesen't slip to the full closure point, but I am not doing this fast either, it passes spine whack too so? The liner bar stops on the "flatter" portion of the blade tang/ramp. BM does put this "failsafe" on their liner locks.

Send it to BM and include a note saying that the liner lock is touching the scale or isn't functioning well. They will most likely replace the liner (with lock) and boom you will have a little more metal and hopefully a nice lock up. I just received one back and the bar wouldnt engage properly, too far to the "near" side. Took it apart and grinded the tiniest bit off, now it locks about 30% of its own width past the ramp/tang. the bars edge is just in the middle. This is "prime" IMO. I am ranting hardcore sorry guys. Wish my digi-cam was working I would take pics of this.

JC
 
whats happened is the grind on the upper base of the spine that
stops the opening blade travel has been ground a bit too deep, casusing the problem you see..yep..send it in!!!
 
Test it. See if the locking bar will move under tension, or fail/pass the spine whack test. You dont have to slam it that hard, you can even do it on your palm just make sure you fingers are clear. Does the 910 have ti-liners or steel? the steel bars wear a bit slower.

JC
 
Before you get too concerned, pop in to your local cutlery shop and compare your knife to the ones there. I really don't think you have a problem, but the best thing you can do for yourself now is to look at a lot more knives that are straight out of the box. I think you'll see this is normal.

Oh, and the "spine wack test"? While I have no opinion on it, someone does need to point out to you that many manufacturers consider it abuse and it will void the warranty.

-Al-
 
It has titanium liners. The liner does not move under pressure. I think I am going to try to find a Benchmade retailer here and see where the 910s there lock up.
 
Check to see if your liner "locks up" at the same point each time you open the blade. If it does, I highly doubt you have any problem.
 
Locks up same point with no play and does no move under pressure. I think it is probably OK but I am going to check out some at a BM retailer to be sure.
 
You will notice that the lock bar face is angled and the tang is curved so as to prevent the bar moving much further over. About half way to 75-80% is considered normal by most here. Try a spine whack test?
 
I have smacked the spine against my hand and no movement. I do not know the proper procedure for a spine whack test. I don't really like the idea of banging it against a hard surface.
 
That is a fair enough test imho, you don't really need to slam it against a hard object. Small rapid taps aught to do the trick, against a mouse mat pref for safety.
 
I want to thank everyone who has responded. You have all been most helpful in quelling any concerns I had about the integrity of the liner lock on my BM. Again, many thanks. I hope someday I can help you all out. If not, I will just have to pay it forward, since i am sure I will never be able to pay everyone back for all the great advice and experiences I have already had in my limited time here.
 
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