 The Clarinet BBoard
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Author: SecondTry
Date: 2021-04-20 05:34
Attachment: Silicone-Rubber-Sponge.jpg (14k)
Take a look at this attached picture's sponge material.
On the sides their appears to be a smooth surface...almost like a wrap for the sponge. The air bubble material within that can be seen by looking at the sponge from a cross sectional view.
I wonder if that stuff could be made into a tuning ring size...compressed into the barrel that is not pulled out from the upper joint.
Add space between the barrel and upper join and the ring expands. The air column "sees" the smoother surface on the outside of the sponge, not the air bubbles within.
Just saying....could be a one size fits all tuning ring...much as I can't speak to whatever negative tonal changes it might cause.
Have at it with criticism
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Author: jdbassplayer
Date: 2021-04-20 06:11
As you compressed it the material would bulge into the bore, but good idea though.
-JDbassplayer
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Author: clarnibass
Date: 2021-04-20 08:15
>> As you compressed it the material would bulge into the bore, but good idea though. <<
You can cut it so with the smallest opening you need, it doesn't expand into the bore. It means it won't be as close to the bore size when you open more, but, since the material is "bubbly", it's possible the amount it will expand to the inside is minuscule.
Probably a bigger problem is that for one of the purposes of having a ring, to make the connection more stable and prevent wobble, it probably won't help at all. It's also possible that it's soft enough that it's a question how much it would help the other purpose of having a ring.
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Author: Matt74
Date: 2021-04-20 08:41
I want a lathe REALLY bad. I could make custom tuning rings, barrels, etc. There’s so much stuff you could make...
But for your sponge idea: A soft gasket could be made to fit so that it fits flush with the bore at any extension (more or less). You could make it to fit flush with the barrel pushed “in”, so that when you pulled “out” a bit it would shrink back so that it recessed a little. There would be a recessed dimple when pulled out, but not a big crack. You could probably engineer a gasket and/or joint profile that would cause most or all of the the bulging to go into the blind part of the socket.
Since you are only pulling out a millimeter or so neoprene, felt, or even soft leather might work. You could add rubber or wax to the very inside edge to make it “hard” and smooth.
- Matthew Simington
Post Edited (2021-04-20 08:42)
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Author: kilo
Date: 2021-04-20 12:39
I've used o-rings to similar effect. One in the barrel socket and one over the upper tenon. Not as elegant and not adjustable but the spacing was always consistent. I also used o-rings for the notoriously sharp Yamaha 221 bass, one over the mouthpiece tenon and one in the neck receiver.
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Author: SecondTry
Date: 2021-04-20 16:03
jdbassplayer wrote:
> As you compressed it the material would bulge into the bore,
> but good idea though.
>
> -JDbassplayer
...excellent point about potential lack of dimensional stability on diameter with expansion and compression of the foam
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Author: Jeroen
Date: 2021-04-21 00:06
I don't think this is a good idea. The soft material will dampen the sound.
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Author: SecondTry
Date: 2021-04-21 01:33
Jeroen wrote:
> I don't think this is a good idea. The soft material will
> dampen the sound.
Hey Jeroen:
For many reasons this idea has its limitations.
But I thought one of them wasn't the material in the sense that the air column does not come in contact with the spongy center as seen in the cross sectional view of the material at my previously provided web link.
Had it, I'd see your point. All the spongy holes are places for air to creep into to possibly upset the smoothness of the bore: to what extent, for such short distances, such a situation would influence sound negatively.
My guess was that pressure in the air column would not be great enough to oppose the bore diameter dimensional stability of the product **once a barrel was pulled out somewhat**, if not of course its, by design, vertical dimensional fluidity.
Then again, with neither material in hand nor enough knowledge about the degree of pressure against the bore walls that playing a clarinet places on this surface I admit to operating from a place with many unknowns, including whether such a product is necessary/beneficial or needed.
** previous points about its diameter changing with expansion and contraction noted, but hopefully static with respect to diameter once a pulled out distance has been established.
Oh well, back to the drawing board!
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Author: clarnibass
Date: 2021-04-21 13:16
>> excellent point about potential lack of dimensional stability on diameter with expansion and compression of the foam <<
Unless it's airy enough and acts sort of like a spring, with no or minuscule amount of side expansion... as long as it's not compressed beyond that point.
>> I don't think this is a good idea. The soft material will dampen the sound. <<
It's much firmer than the air pocket that is there without it.
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