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 Re: What Is An Overhaul?
Author: L. Omar Henderson 
Date:   2006-09-05 14:20

(Disclaimer - I am a designer of the Forte' Bb and C clarinets)
The most important modulators of the air flow - or wave- starts at the top with the player, mouthpiece, reed, and ligature affecting the vibration of the reed. Some mouthpiece makers have indicated that the texture of the interior of the mouthpiece affects tone but I have no data on this element. The barrel too has a significant effect on the air column. The most important factor in the body of the clarinet is the shape, diameter of the bore, and the tone hole - including placement (longitudinal distance and relationship to other tone holes in radial placement).

Since the tone hole/holes is the exit point of the air column there are several factors affecting tone hole configuration - primarily chimney height and then shape, which includes radial diameter, conformity to roundness, and air flow characteristics. The air flow characteristics can include smoothness of the tone hole and the flow path from the bore which is modulated by the shape and degree of undercutting.

In our experience the smoothness of the bore has very little effect on tone from a matte (240 grit emery cloth sanding) finish to highly polished finish.

Smoothness of the interior of the tone hole and undercutting do have an effect. Perfect levelness of the top of the tone hole contacting the pad has an effect due to pad sealing characteristics. These subjective assessments are backed up by our own interpretation of spectrograph frequency spectrum analysis measurements. We have optimized our type of tone hole undercutting with the corresponding frequency patterns desired but have not done extensive studies on other approaches and profiles of undercutting. Many of our profiles of instrument design have been mathematically modeled but most still require extensive practical testing and tweaking.
L. Omar Henderson



Post Edited (2006-09-05 14:33)
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 What Is An Overhaul?  new
Chris P 2006-08-30 17:32 
 Re: What Is An Overhaul?  new
Bob Phillips 2006-08-30 17:54 
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tictactux 2006-08-30 19:56 
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Vytas 2006-08-30 20:33 
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tictactux 2006-08-30 20:50 
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am0032 2006-08-30 21:06 
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Ralph G 2006-08-30 21:07 
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Chris P 2006-08-30 21:35 
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Chris P 2006-08-31 12:59 
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 Re: What Is An Overhaul?  new
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 Re: What Is An Overhaul?  new
Chris P 2006-08-31 14:57 
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 Re: What Is An Overhaul?  new
Chris P 2006-08-31 19:49 
 Re: What Is An Overhaul?  new
BelgianClarinet 2006-08-31 20:23 
 Re: What Is An Overhaul?  new
Vytas 2006-08-31 21:03 
 Re: What Is An Overhaul?  new
Bill 2006-09-02 16:37 
 Re: What Is An Overhaul?  new
Gordon (NZ) 2006-09-01 02:05 
 Re: What Is An Overhaul?  new
Chris P 2006-09-01 06:28 
 Re: What Is An Overhaul?  new
Vytas 2006-09-02 15:57 
 Re: What Is An Overhaul?  new
Chris P 2006-09-03 01:31 
 Re: What Is An Overhaul?  new
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 Re: What Is An Overhaul?  new
clarnibass 2006-09-03 06:03 
 Re: What Is An Overhaul?  new
Gordon (NZ) 2006-09-03 12:30 
 Re: What Is An Overhaul?  new
tictactux 2006-09-03 16:09 
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Mark Charette 2006-09-03 17:15 
 Re: What Is An Overhaul?  new
Chris P 2006-09-03 12:57 
 Re: What Is An Overhaul?  new
clarnibass 2006-09-03 12:59 
 Re: What Is An Overhaul?  new
Vytas 2006-09-03 16:12 
 Re: What Is An Overhaul?  new
Cuisleannach 2006-09-04 00:01 
 Re: What Is An Overhaul?  new
Gordon (NZ) 2006-09-04 01:49 
 Re: What Is An Overhaul?  new
Mark Charette 2006-09-04 02:05 
 Re: What Is An Overhaul?  new
Cuisleannach 2006-09-04 02:20 
 Re: What Is An Overhaul?  new
Gordon (NZ) 2006-09-04 05:25 
 Re: What Is An Overhaul?  new
clarnibass 2006-09-04 05:29 
 Re: What Is An Overhaul?  new
Chris P 2006-09-04 06:58 
 Re: What Is An Overhaul?  new
Mark Charette 2006-09-04 13:13 
 Re: What Is An Overhaul?  new
Cuisleannach 2006-09-05 06:45 
 Re: What Is An Overhaul?  
L. Omar Henderson 2006-09-05 14:20 
 Re: What Is An Overhaul?  new
Vytas 2006-09-09 19:03 
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Vytas 2006-09-08 17:10 
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Mark Charette 2006-09-08 17:49 
 Re: What Is An Overhaul?  new
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 Re: What Is An Overhaul?  new
Mark Charette 2006-09-08 20:00 
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 Re: What Is An Overhaul?  new
Chris P 2006-09-08 19:12 
 Re: What Is An Overhaul?  new
Gordon (NZ) 2006-09-09 00:26 
 Re: What Is An Overhaul?  new
Cuisleannach 2006-09-09 03:12 
 Re: What Is An Overhaul?  new
Cuisleannach 2006-09-09 23:09 
 Re: What Is An Overhaul?  new
Dan Shusta 2006-09-10 00:14 
 Re: What Is An Overhaul?  new
Gordon (NZ) 2006-09-10 00:31 


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