Klarinet Archive - Posting 000611.txt from 2000/01

From: GrabnerWG@-----.com
Subj: Re: [kl] Mouthpieces and Intonation
Date: Tue, 18 Jan 2000 00:58:15 -0500

In a message dated 1/17/00 9:05:18 PM Central Standard Time,
reedman@-----.com writes:

<<
I may have misunderstood a point Walter was trying to make when he stated:

"If you have a mouthpiece with a bore that flares to 15.1 mm, and you put
it
> on a Buffett R-13 with a 14.76 bore, what will happen????"

Am I to understand, Walter, that you believe that the bore at the end of the
mouthpiece (exit bore) should match the bore at the top of the barrel?

No Clark, you didn't mis-understand me, I wasn't responding early in the
morning, pre-third cup of coffee, and without my gauges handy. I was dead
wrong in my example.

If one takes 14.76mm to be the "nominal" bore of a standard R-13 , this
number refers only to the area of the bore in approximately the middle third
of the instrument. The polycylidrical R-13 bore has two more steps in the top
third of the clarinet that results in a bore at the top joint of about .587"
give or take a few thousandths. (Not very consistent!)

Before I go much further I would like to start speaking to bore dimensions
in terms of .001" of an inch. This is a much more accurate way of measuting
and is more meaningful to me at least. Multiply Walter's metric equivalants
by 39 and we can reach a very close approximation to .001"

15.1 x 39 @-----.589" (rounded up)
14.76 x 39 @-----.576" (rounded up)

If you were to try to play a barrel with a top dimension of .576 on a Buffet
R-13 you would be very unhappy. Most Moenning barrels are about .588 -.589 at
the top and then taper to about .578-.579. Standard Buffet barrels start at
about .588, but have
very little taper

.589" is a little small for the exit bore of a mouthpiece unless you are
using an old Chedeville style bore that has less taper and is a bit larger at
the top bore than most of the Kaspar moutpieces .

In my work I have found that the barrel/mouthpiece combinations is extremely
important. One can correct some inherent deficiencies in a mouthpiece with a
properly adjusted barrel. Most American players now favor a medium large bore
(like the Kaspar mouthpieces) and an inverted cone barrel.

Most *good* Kaspars that I have measured have exit bores right around .595".
If one were to use a barrel with a similar measurement at the top the tone
would be quite diffuse and (assuming a barrel length of 65mm -66mm) would be
quite flat in the throat tones. A properly made inverted cone barrel balances
the overall volume of the mouthpiece/barrel bore and will bring the larger
bore mouthpiece into good modal ratios.

Walter is also correct about the problems of bore "warpage" during the
cooling process. This is why it is absolutely essential to use reamers to
bring the bore up to specs. I use 4 reamers when working on or checking the
bores of my mouthpieces and they all have slightly different functions.

Another interesting aspect of adding a sudden reduction to the bore just
below the mouthpiece

>

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From: "Clark W Fobes" <reedman@-----.com>
To: <klarinet@-----.org> >>

Walter Grabner
who is...........
ClarinetXpress
Mouthpieces & More!!!!
http://www.clarinetxpress.com

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