Klarinet Archive - Posting 000646.txt from 1999/12

From: Jennifer Jones <JJONES@-----.EDU>
Subj: Re: [kl] Oh no, a crack/Question?
Date: Mon, 20 Dec 1999 00:28:41 -0500

Dave Renaud wrote:
> A repair technican recently told me that filling with
> CA glue was now the repair of choice over pinning. Could others
> confirm this to be.
> Also, is it prefered to let a clarinet sit unplayed for some
> time that it my dry out, and the crack close somewhat
> before filling?

With the expansion and contraction of materials due to temperature and humidity
(more a factor here with wood than a glue filler), I would expect filling a
crack would cause the crack to grow. As the bore expands with rising
humidity/temperature I would expect it to expand in all directions, including
towards the crack, thus causing it to close. At the same time, wouldn't the
material used to fill the crack expand and force the crack open more?

Considering cracks are measured in microns, it doesn't seem possible to control
the temperature/humidity precisely enough to prevent the above from occuring
and still play the instrument.

I haven't had any personal experience with repaired cracks so I would
appreciate a knowledgeable person's input.

Thanks,

Jennifer H. Jones

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