Lynn Griffith Knives, a question...

Marion David Poff

Marion David Poff

Joined
Oct 8, 1998
Messages
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All you owners of his fine blades, is the spine broken by the grind plunge?

I notice on most of his knives that I have seen pictures of, there is a distinct grind plunge that goes straight to the spine, and it looks as though the spine would be broken.

For instance, on the flat ground custom knives I own, the grind thins and blends towards the spine, so that the spine is not cut by the grind.

One way to tell is to look at the knife from the spine, if there is a ledge that co-incides with the grind, then the spine has been broken by the grind.

Note- This is not uncommon, all of the Spyderco Morans and some of the SAK's I have owned have the spine broken by the grinds.

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Thank you,
Marion David Poff aka Eye, Cd'A ID, USA mdpoff@hotmail.com

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My SUB Texan's spine is "broken" by the grind.

Actually, I took another look at it, and you can't really tell if the spine is broken by the grind, or it is just one of the thumb serrations. So, disregard what I said above.
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iktomi

[This message has been edited by rockspyder (edited 05-18-2000).]
 
Checking the ones I have on hand I don't think so. It is hard to judge accurately without equipment because their are serrations (?) on the top edge in that area. But, to the naked eye it looks like it does not break but comes just too the edge of breaking.
Davy
 
Eye, it probably depends on the knife and the mood Lynn is in at the time! I just read a review of a model where the blade is about 1/8" ad the handle is 5/32" (according to the reviewer), so in that case, the spine would be broken. Not something I could fix, unfortunately!
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Is there anything wrong with doing things that way, or is it simply a cosmetic trype of thing?
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[This message has been edited by Chiro75 (edited 05-16-2000).]
 
Well, a machinists handbook will tell you that sudden changes in geometry or profile, notches, holes, etc are where stress focuses and causes tool failure.

But given the fact that ATS-34 is really not all that tough anyway, and so you should be thoughtful in your use. As well, Lynn is very clear about what you should and should not do. Given those two considerations I would not be concerned.

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Thank you,
Marion David Poff aka Eye, Cd'A ID, USA mdpoff@hotmail.com

My Talonite Resource Page, nearly exhaustive!!
My Fire Page, artificial flint and index of information.

"Many are blinded by name and reputation, few see the truth" Lao Tzu
 
ATS-34 isn't very tough? I beg to differ. My Ross Aki Straight Back Machete is tough as hell. ATS-34 isn't tough if you heat treat it poorly, but the same goes for any steel. My SBM is tough as nails and you can bend it every which way to Sunday and the thing comes back to true!

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Marion on my Griffith, the MNK, the grind goes all the way to the top in a straight line but has faded out by the time it reaches there so there is just a wisper of a break. If you want to check it out I'll drop it in with one of the other knives we were discussing awhile back. Concerning the effect it may have, as a reference :

http://www.bladeforums.com/ubb/Forum3/HTML/001234.html

Of course the Bowie grind might not be similar.

Chiro, that isn't an indication of toughness, any thin steel will do that.

-Cliff


[This message has been edited by Cliff Stamp (edited 05-17-2000).]
 
Marion,
As a full time tool maker/machinist/CNC programmer/heat treater/etc. (I have a large hat rack at work
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I'm very familiar with cracks in hardend tools developing from areas as you mentioned above. I have tooling crack during heat treat from sharp corners, slots, holes and other unavoidable odd shapes!! Therefore I understand the point you are making.
I think that many times you will see this done on blades in order to thin the overall blade. I have a fillet knife by a well known maker that has the plunge lines runing into the spine. It's also often seen on multi blade folders in addition to asymetrical grinds to clear the blades in their closed positions. I feel as long as there is at least some radius in the plunge grind, this will keep the chance of cracking or breakage to a minimum.
Both my Griffith knives have the plunge grinds going right to the top of the spine but in no way intersect it. Much has been said here lately about Lynns knives and I must say, mine (Sniper&Marksman) are PERFECT! Fit, finish and attention to detail are PERFECT!!
Neil

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