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Klarinet Archive - Posting 000696.txt from 2001/04

From: "Dee D. Hays" <deehays@-----.net>
Subj: Re: [kl] FW: [kl] Response to Dee regarding cracks
Date: Sun, 29 Apr 2001 08:05:22 -0400

----- Original Message -----
From: "Daniluk, Bill" <bdaniluk@-----.com>
Subject: [kl] FW: [kl] Response to Dee regarding cracks

>
>
> I have neither 25 years of engineering experience, nor world renown as a
> repair person, but is it not possible that both of these knowledgeable
> individuals are correct? It does seem intuitive that if a steep
> temperature gradient alone could cause an instrument to crack, there
> would be a lot more cracked clarinets (given the marching band example
> below) than it seems there are. If the sharp temperature gradient would
> only cause a crack if there were some material flaw, would not the
> constant expansion/contraction of the change in humidity over time tend
> to excacerbate a minor (non crack causing flaw) to the point where a
> sudden temperature change would cause the crack to occur?
>
> Just askin'
> BD

If you'll look back, that's basically what I said, that there must be some
other pre-existing condition (although I didn't indicated what that might be
as I don't know). i.e. Temperature gradients could be the "straw that
breaks the camel's back" but it is not the root cause. Some other condition
has put the instrument on the ragged edge of cracking. Find and solve that
root cause, whatever it may be. The "everybody knows" syndrome has locked
people in on the temperature concept and no one is really investigating the
root cause.

Dee Hays
Michigan

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