 The Clarinet BBoard
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Author: m1964
Date: 2021-10-27 03:36
Hi all,
thank you for your replies to my previous post about cleaning water damaged R13.
After I took off all the keys, I noted two superficial cracks on the lower tenon that originate from the tenon ring on the upper part of the tenon.
I also found another crack through the rim of the bell tenon. The picture is attached.
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Author: Chris P
Date: 2021-10-27 21:49
Tenon cracks are easy to deal with - use low viscosity/instant grab superglue to wick into the cracks and that will keep them in check. They're in compression when fitted into their respective sockets and are much easier to deal with compared to cracked sockets.
If you are concerned about the strength, you can always fit metal tenon tip rings/tenon caps to reinforce them or even carbon fibre band the lower tenon ring if you prefer the all wooden look.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
Post Edited (2021-10-27 21:54)
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Author: m1964
Date: 2021-10-27 22:01
Attachment: 043.JPG (1220k)
Chris P wrote:
> Tenon cracks are easy to deal with - use low viscosity/instant
> grab superglue to wick into the cracks and that will keep them
> in check. They're in compression when fitted into their
> respective sockets and are much easier to deal with compared to
> cracked sockets.
>
> If you are concerned about the strength, you can always fit
> metal tenon tip rings/tenon caps to reinforce them or even
> carbon fibre band the lower tenon ring if you prefer the all
> wooden look.
>
>
> Post Edited (2021-10-27 21:54)
Hi Chris,
Do you think this crack needs any reinforcement after superglue repair?
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Author: Chris P
Date: 2021-10-29 14:35
Only if it can't be successfully glued together if it's contaminated with grease. Clean it out well with solvent and then see if superglue will wick into it and bond well. If not, then either machine down the tenon ring and fit a metal tenon ring/cap to it or cut a groove in it and carbon fibre band it.
Although the tenon will be in compression in normal use, so it's not in serious risk of cracking.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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Author: m1964
Date: 2021-11-01 04:54
Chris,
Thanks for your advice- I was able to glue it. The bell tenon wall is thinner than other tenon walls, so I would be afraid to do anything else becides gluing it.
Looks like it will hold, and I think that I will put thin tenon cork so when the bell is placed it does not produce excessive forces on the tenon wall.
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Author: clarnibass
Date: 2021-11-01 08:30
>> and I think that I will put thin tenon cork so when the bell is placed it does not produce excessive forces on the tenon wall. <<
No need to worry about it much. Compression in this direction almost never causes cracks, if anything some force can help prevent cracks, like a friction fit metal tenon ring. Though the bell tenon cork joint doesn't need to be as strong as the others anyway.
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Author: m1964
Date: 2021-11-01 19:38
clarnibass wrote:
>.... Though the bell tenon cork joint doesn't need to be as strong as the
> others anyway.
Exactly
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