 The Clarinet BBoard
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Author: SecondTry
Date: 2021-06-21 14:51
Attachment: backun.jpg (179k)
Q1) Does Backun make Eb clarinets? I saw a Youtube video where Jessica Phillips talks about how Backun made (or maybe customized) her Eb clarinet with her--and I don't think she just meant the barrel or bell....
https://youtu.be/_Ub-jKHFEQg?t=156
Q2) What does the attached picture depict? I ask because I thought that fraising or undercutting tone holes to raise the picture of the fundamental was done at the end of the tone hole closest to the bore, not the fingers--assuming the hardware shown is in fact for fraising. The blade size seems a bit large for restoring a shrunk tone hole's size. Then again, maybe it's just a picture.
Thanks.
Post Edited (2021-06-21 14:53)
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Author: jdbassplayer
Date: 2021-06-21 16:32
Backun the company does not offer them (yet at least), but Morrie Backun is a world class repair tech and could probably design and build one if you paid enough. That being said I think it is more likely to be a Selmer or Buffet that has been heavily modified and rebored, essentially the same as creating a new instrument but probably much less expensive.
You are correct in that undercutting is done on the edge between the bore and tone hole, this tool is just for creating a chamfer on the outer edge of the tone hole to smooth it out. Personally I prefer a sharp tone hole edge but others do not. I would only do this on a tone hole with a pad personally. I believe Morrie sometimes calls this “overcutting”. Whether it has an acoustical effect I’m not sure.
-Jdbassplayer
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Author: Chris P
Date: 2021-06-22 19:51
Sharp tonehole rims reduce pad life and aren't necessary even if Buffet happen to use razor sharp tonehole rims on their clarinets which make light work of punching the centres out of pads.
What's more important are the toneholes being level and having no imperfections which will cause leaks and razor sharp toneholes are more likely to lose bits of wood being how thin they are and pushing the limits of the wood to beyond its structural integrity.
The rims can be flattened to provide a slightly wider surface for pads to seat against as well as making a much stronger tonehole rim than having them razor sharp which also makes them more pad friendly. Then they can be thinned down with a spherical reamer to reduce their width, but not making them razor sharp again.
'Overcutting' the toneholes increases the general diameter of the tonehole rim but not the tonehole itself and has hardly any effect on the tuning.
Therefore sharp tonehole rims = bad.
Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.
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