Klarinet Archive - Posting 000070.txt from 2009/09

From: "Karl Krelove" <karlkrelove@-----.net>
Subj: RE: [kl] Mouthpiece Bores
Date: Thu, 17 Sep 2009 11:23:06 -0400

Are these calipers available commercially or something you've made for
yourself?

I had a teacher who had a reamer made to match one of his "extra" Cheds. He
then started reaming his students' mouthpieces with the thing. The result
when he did it to my Ann Arbor Kaspar (they were neither rare nor expensive
in those days) was a disaster. We both learned something that day, I think.

Thanks,
Karl

> -----Original Message-----
> From: David McClune [mailto:dmcclune@-----.edu]
> Sent: Thursday, September 17, 2009 10:45 AM
> To: klarinet@-----.org
> Subject: RE: [kl] Mouthpiece Bores
>
> Measuring a bore by eye is very silly and useless. The difference
> between a small bore and large bore mouthpiece exit bore is 100th of an
> inch! I use a special set of calipers attached to a dial indicator.
> It has two arms which go out then the ends bend in opposite directions.
> I push it up the bore to where the crown or cone starts (looking down
> the chamber in good light to see), then read the measurement. I pull
> it to the exit and measure there. THEN I start again and slowly pull
> the guage out noticing if the bore taper is changing evenly or has
> parallel walls (some do) with another taper.
>

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