Blade pivot's
- Thread starter sdw
- Start date
- Joined
- Nov 16, 1998
- Messages
- 1,345
I think they are both the same thing. Hmmmm, maybe I'm wrong though!
Mark
AKTI Member #A000003
Quote = MOST OF THE TIME! LOL
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Mark
AKTI Member #A000003
Quote = MOST OF THE TIME! LOL
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A simple screw-together pivot is basically like a Corby rivet. It has a female end that has a threaded tube stepped to a larger-diameter head, and a male end that has a threaded post with a standard screw head. I sometimes just use stainless Corbies with the heads ground down (need to make new drivers), though brass might work well, too.
A bushing is a tube (collar) of a softer metal (usually brass) that fits around the pivot shaft, and by wearing more easily and offering two slipping surfaces instead of one, gives a smoother action. They may be used on screw-together pivots, but are especially nice when the pivot is just a pin. I haven't honestly noticed much difference between folders with bushings and those with polished steel pivots.
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-Drew Gleason
Little Bear Knives
A bushing is a tube (collar) of a softer metal (usually brass) that fits around the pivot shaft, and by wearing more easily and offering two slipping surfaces instead of one, gives a smoother action. They may be used on screw-together pivots, but are especially nice when the pivot is just a pin. I haven't honestly noticed much difference between folders with bushings and those with polished steel pivots.
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-Drew Gleason
Little Bear Knives
Thanks Corduroy
I was'nt quite sure about the bushings.I've seen pictures of them and they are just what you said.Some companies use them and I wonder if there is some kind of advantage over the screw together type.I think the key to smoothness on liner locks(for example) is in the blade ,washer,and liner surfaces.not necessarily the pivot action.
scott w
I was'nt quite sure about the bushings.I've seen pictures of them and they are just what you said.Some companies use them and I wonder if there is some kind of advantage over the screw together type.I think the key to smoothness on liner locks(for example) is in the blade ,washer,and liner surfaces.not necessarily the pivot action.
scott w
I think you might be getting things confused here . . .
A normal rivetted or screwed pivot pin would run through the blade and bolsters and basically squeeze the three together (a system used in most traditional folders). This can obviously lead to a very tight rotational movement.
To get around this problem makers use a pivot bush which is essentially a collar (or sleeve) around the pivot pin, fractionally wider than the blade. This bush only operates within the blade, and not the bolsters. The pivot pin hole in the blade is drilled wider to accomodate the bush, with the pivot pin going through the bush. When the bolsters are rivetted or screwed together they squeeze down onto the bush rather than the blade, making the rotation easier.
Some knifemakers enhance this by adding two other bushes (or spacers) on either side of the blade. All this helps to reduce the bearing surface and smooth the rotation of the blade within the bolsters whilst retaining a solid pivot (i.e. no blade wobble).
Regards, HILTON
A normal rivetted or screwed pivot pin would run through the blade and bolsters and basically squeeze the three together (a system used in most traditional folders). This can obviously lead to a very tight rotational movement.
To get around this problem makers use a pivot bush which is essentially a collar (or sleeve) around the pivot pin, fractionally wider than the blade. This bush only operates within the blade, and not the bolsters. The pivot pin hole in the blade is drilled wider to accomodate the bush, with the pivot pin going through the bush. When the bolsters are rivetted or screwed together they squeeze down onto the bush rather than the blade, making the rotation easier.
Some knifemakers enhance this by adding two other bushes (or spacers) on either side of the blade. All this helps to reduce the bearing surface and smooth the rotation of the blade within the bolsters whilst retaining a solid pivot (i.e. no blade wobble).
Regards, HILTON
Bushings tend to be bronze, not brass.
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Regards,
Desert Rat
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Regards,
Desert Rat
Bushings tend to be bronze, not brass.
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Regards,
Desert Rat
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Regards,
Desert Rat