 The Clarinet BBoard
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Author: gatto
Date: 2017-07-16 19:10
My new A-clarinet has a small gap (between 0,1 and 0,2 mm) between the outer metal ring of the lower joint and the outer wood edge of the upper joint. So as if the socket of lower joint is slightly too short.
Does this have or may create certain disadvantages?
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Author: Chris P
Date: 2017-07-16 19:15
That's fine - in fact, it's an advantage if anything as it means there's no gap between the end of the tenon and base of the socket.
Provided the tenon is a good fit in the socket and doesn't rock, it won't be a problem.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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Author: toffeeman3
Date: 2017-07-17 01:15
Agree,
But as a mech eng I would expect better accuracy,which model is it?
07469847273
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Author: Chris P
Date: 2017-07-17 01:41
If it was a 0.1-0.2mm difference between the diameter of the tenon and the socket, then that will be an entirely different matter.
A tenon that's around 0.1-0.2mm longer than the socket isn't anything to worry about. yes they could probably be machined to fit better, but a guaranteed gap-free fit between the upper and lower joint bores is ensured with a fractionally longer tenon.
Fairly often the socket ring is slightly proud of the socket either due to machining of the socket ring slot or the extra thickness of the socket ring after being plated, so that can prevent the joints fitting perfectly together.
Absolute text book accuracy isn't ever likely achieved in any woodwind instrument. You can get very close, but never absolutely dead perfect. Remember that wood is a live material and metal is unforgiving, so neither materials are suited to being used together.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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Author: gatto
Date: 2017-07-17 02:19
Model: RC Prestige.
The tip of a reed fits into this gap, and a little more. So my estimation, 0,1 mm (= tip thickness of the reed) to 0,2 mm.
Yes, wood is "living". In the shop the bell metal ring was not prefectly fitting (sharp edges), but this could be fixed. The dealer (= woodwind repairs man) told me that this certainly was no bad production in the factory, but has happened later since the wood "worked".
The connection between the joints is tight, no movement whatsoever. So I understand that this is no problem. What about the vibration of the wood, i.e. the whole instrument? Is this "somehow" disturbed / interrupted?
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Author: TomS
Date: 2017-07-17 03:41
Better to have the gap on the outside than on the inside.
Tom
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Author: WhitePlainsDave
Date: 2017-07-17 05:38
FWIW I've been trained, when tuning pitch down, that there comes a point where pulling out the barrel should be stopped in lieu of separating the very upper and lower joints you report naturally position themselves that way on your setup..
This is recommended as the barrel does not drop all notes down in pitch evenly
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Author: clarnibass
Date: 2017-07-17 09:51
>> But as a mech eng I would expect better accuracy <<
As a mechanical engineer I imagine you know that the accuracy/tolerance needed to have both the tenon and socket meet at both inside and outside is zero. In this context, it doesn't exist. The best realistic tolerance is much more, especially considering they are two wood parts.
So the only real choice is to have that gap either on the inside or the outside. There are advantages and disadvantages but they are all pretty minor, possibly insignificant.
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