- Joined
- Jul 27, 2022
- Messages
- 503
I took my Impinda apart last night just for kicks, and found something odd, which I hope someone here can shed some light on. Like you'd expect, there's a threaded bushing and a matching screw. The odd thing is - only one of those parts accepts a hex wrench, and it's the bushing, not the screw. Further odd, in my view, is that the head of the screw is cut with a lip, ostensibly in order to lock the part in place so it doesn't rotate when the assembly is tensioned. This seems totally backward to me; normally you'd want the female part stationary so you were free to tension the male part, so you'd put that little lip/detente on the bushing, not the screw, and you'd put your hex-head on the screw, so you could tighten it.
The assembled pivot. This side, which I'd expect to be the bushing, is actually the screw.
This part is the bushing, which must be installed before the screw in order to hold the knife together.
Bushing takes hex, and can rotate freely, no lip/detente to keep it locked in place as you tighten the assembly.
Screw has that lip on it, which you can see corresponds to a machined matching lip inside the countersink around the pivot.
Here's the bushing (installed first) and the screw/lip ready to be put in place, but why is this - the moving part - the one that's machined to not move? Again, the only hex-head fits into the bushing, not the screw. So you have to manually start the threads on the screw, then start twisting the bushing on the other side with a wrench in order to tighten the pivot - which means you can't assure the lips are matching up, because you can't see them or adjust them to fit. The only possible thing I could think of was that it had something to do with being able to adjust your preferred tension on the pivot point, but even that's a stretch. Any ideas? Am I just projecting my own desire for superior engineering onto an object that doesn't really need it?
The assembled pivot. This side, which I'd expect to be the bushing, is actually the screw.
This part is the bushing, which must be installed before the screw in order to hold the knife together.
Bushing takes hex, and can rotate freely, no lip/detente to keep it locked in place as you tighten the assembly.
Screw has that lip on it, which you can see corresponds to a machined matching lip inside the countersink around the pivot.
Here's the bushing (installed first) and the screw/lip ready to be put in place, but why is this - the moving part - the one that's machined to not move? Again, the only hex-head fits into the bushing, not the screw. So you have to manually start the threads on the screw, then start twisting the bushing on the other side with a wrench in order to tighten the pivot - which means you can't assure the lips are matching up, because you can't see them or adjust them to fit. The only possible thing I could think of was that it had something to do with being able to adjust your preferred tension on the pivot point, but even that's a stretch. Any ideas? Am I just projecting my own desire for superior engineering onto an object that doesn't really need it?
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