Quote from: Mechanickal on January 22, 2018, 07:45:55 PMIt's always worth asking You asked to give stuff to me though, I may have identified the flaw in your technique for getting free stuff.
It's always worth asking
Oh I just remembered, my own EDC Spirit is actually a display model as is the one I bought for my brother, and those at least haven't loosened, in fact you still really can't lift the Phillips with your nail, a common feature in new Spirits.
Quote from: Gath on January 22, 2018, 09:52:42 PMOh I just remembered, my own EDC Spirit is actually a display model as is the one I bought for my brother, and those at least haven't loosened, in fact you still really can't lift the Phillips with your nail, a common feature in new Spirits.Maybe that's because a Spirit has no backsprings ...
I got some Wenger stuff a few years ago, from the main dealer, when Wenger stopped making SAKs, by asking nicely and buying a few things.
I don't like buying display models myself, but:The backspring in a Vic never reaches the critical zone for the steel when opening it. (Not sure what it called in English, you're always within the elastic zone => the steel goes 100% back to its original shape.) Which brings us to the next point, the central part of material fatigue when you keep within the elastic zone is the number of load cycles. In other words, the number of times the knife has been opened is more important than how long it has been in the stressed position. (Think of the discussion among gun owners of whether to store magazines full or empty to keep the spring for a long time, if there really was a clear, straightforward difference, I doubt the discussion would have gone on the way it has.)The part about spring tolerance is from Vic, the part about loading cycles is basic materials science I learnt from a metalurgist.
Quote from: dks on January 21, 2018, 03:58:55 PMI got some Wenger stuff a few years ago, from the main dealer, when Wenger stopped making SAKs, by asking nicely and buying a few things.Seriously I would love to know what you got from the main dealer Are there any past threads I can view??
Thanks for the info Steinar, I vaguely remembered something like that, but I really don't know enough about metallurgy or springs specifically to be sure.All that makes sense though, and my experience with the Spirit seems to support the hypothesis.Furthermore placing them I never felt a particularly high pressure, and if I did they corrected themselves by snapping another tool on the blade closed, which resulted in only about five cuts during the placing, the tools end up dangling pretty loosely actually, none of the blades are placed so that the spring would be at the part of the cycle it is most strained.Oh, and I think we'll have to pardon Top-Gear-24 the brilliant simplicity of the Spirit spring is easily dismissed as some kind of design magic.
Quote from: Top-Gear-24 on January 22, 2018, 10:07:28 PMQuote from: Gath on January 22, 2018, 09:52:42 PMOh I just remembered, my own EDC Spirit is actually a display model as is the one I bought for my brother, and those at least haven't loosened, in fact you still really can't lift the Phillips with your nail, a common feature in new Spirits.Maybe that's because a Spirit has no backsprings ... It does!
Well they don't have actual backsprings either.Just the springed "fingers"
The things on the Spirit that you call springs are part of the locking mechanism, they do not need to build up tension in any way, they just need to lift up so the tools can lock, and while they lift up they do build up a bit of tension, but nothing close to the tension on the backsprings of a SAK.
Though if the claim from Victorinox that Steinar posted, that the springs always remain in the elastic zone is true it could be relevant, as looked in from the metallurgy angle the effect in SAKs should be equivalent.