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From: WVE~ol.com
Date: Wed, 2 Oct 1996 13:21:00 -0400
Subject: Re: Reed fatigue revisited

In a message dated 96-10-01 21:52:38 EDT, Snaruhn writes:
>
>Though R. Epping mentioned that to the experience of Hohner/Richmond only
>some
>5% of reed breaks are caused by tuning, I consider tuning by files a very
bad
>
>method also by another reason.

In material engineering, it is well known that stress concentrations occur at
scratches and notches. Because the material is removed near the point of
attachment where the stresses are highest, there is a known failure mechanism
for scratches, gouges and sudden changes in thickness.

I have modified a jeweler's file that allows my file strokes to be along the
length, not across, the reed. I try to remove the material over about 1/3 of
the reed length near the point of attachment and to smoothly taper the ends
of the area of removal. This way any scratches run along, not across, the
reed. Polishing with fine sandpaper may not be necessary but certainly
doesn't hurt. The rule should be "NO SUDDEN CHANGES IN THICKNESS"

Vern