 The Oboe BBoard
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Author: Chris P
Date: 2011-07-13 15:52
Most makers will fraise back keys mounted across the body so there's a certain amount of end play to prevent them binding between the pillars with humidity changes. The usual suspects are the 1st 8ve key, the F vent and F vent rocker, the Eb and low C# keys as these are lightly sprung and mounted between pillars where they run across the grain. Wood will shrink and expand widthways far more than it will lengthways with changes in humidity so joints will often be slightly oval.
Metal doesn't have as much thermal expansion as wood and nowhere near as much as plastic, so you needn't worry about long keys on wooden instruments binding solid between pillars when the humidity changes. But be aware that socket linings can split the sockets or become loose if subjected to sudden changes in humidity.
It's a different matter with plastic instruments as the rate of thermal expansion/contraction is considerable, so all keys will need a certain amount of end play relative to their length in order for them not to bind up between pillars when cold - some long keys such as the top joint trill beam and the feather keys will need as much as 1mm of end play (and even more on plastic cors) to ensure they work under all conditions.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
Post Edited (2011-07-13 15:53)
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GAWN |
2011-07-11 16:32 |
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Chris P |
2011-07-11 16:41 |
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Wes |
2011-07-11 17:26 |
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GoodWinds |
2011-07-12 04:51 |
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RobinDesHautbois |
2011-07-12 17:00 |
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jeremyreeds |
2011-07-13 12:26 |
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Re: Travelling, Climate, Acclimatization? new |
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Chris P |
2011-07-13 15:52 |
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RobinDesHautbois |
2011-07-13 16:51 |
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The Clarinet Pages
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