Klarinet Archive - Posting 000551.txt from 1999/11

From: PyneClarion@-----.com
Subj: [kl] Irregular Mouthpieces
Date: Sun, 14 Nov 1999 14:44:01 -0500

Michael,

You asked,

>1. I assume the bore of the mouthpiece is drilled, but how is the
>throat typically machined and shaped to integrate with the bore?

With curved files or a machine similar to a broaching apparatus that operates
with a back and forth motion.

Also you questioned,

>2. Why is it not possible to extrude or mould (if those are the correct
>terms) the plastic mouthpiece and gain the apparently fine dimensional
>tolerances that seem to be readily achieved with other plastic products?
>Michael

Hard rubber is difficult to mold accurately and the interior shapes of the
mouthpiece make core removal a problem. Also "fine dimensional tolerances"
are usually thought of as being in the neighborhood of + or - .001. Better
tolerances than that are needed especially in the facing curve, possibly
.0002 or so.

---James Pyne
Pyne/Clarion, Inc.
http://www.pyne-clarion.com
1-800-JPYNE-440
614-766-7878 phone
614-766-7043 fax

>James Pyne wrote:
>"On the other hand, clarinet and saxophone mouthpieces are irregular in
shape,
>both inside and out, yet must be held in a position in which some sort of
>machining tool (and this varies between manufacturers) can cut the facing.
etc."
>
>James,
>My curiosity is aroused.
>1. I assume the bore of the mouthpiece is drilled, but how is the
>throat typically machined and shaped to integrate with the bore?
>2. Why is it not possible to extrude or mould (if those are the correct
>terms) the plastic mouthpiece and gain the apparently fine dimensional
>tolerances that seem to be readily achieved with other plastic products?
>Michael

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