Epoxy on soundboards

[Bernhard Stopper]

If applied only on the upper side, the epoxy cannot constrain the panel,
since it is only a thin film. Applied on both sides will have a constraining
effect caused by the distance of the both sides. (T-beam effect) So if the
panel takes moisture from the under side, it will crown downwards i think.

regards,

Bernhard

----- Original Message ----- 
From: "David Love" <davidlovepianos@comcast.net>
To: "'Pianotech'" <pianotech@ptg.org>
Sent: Wednesday, October 20, 2004 3:24 PM
Subject: RE: Epoxy on soundboards


> I don't know exactly, but the epoxy presumably penetrates the board a
> fairly small amount on the top.  So the lower part of the panel will
> want to expand as it takes on moisture.  So as the lower part of the
> panel is wanting to expand, but the top of the panel is held rigid, what
> will happen?
>
> David Love
> davidlovepianos@comcast.net
>
> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
> Behalf Of Ron Nossaman
> Sent: Wednesday, October 20, 2004 6:02 AM
> To: Pianotech
> Subject: RE: Epoxy on soundboards
>
>
> >Here's my real question:  If you dry down the panel and wedge it up,
> >then epoxy it and let it cure while the board is still in a dry state
> >and then allow it to take on moisture, will the panel crown a bit as it
> >takes on moisture?
> >
> >David Love
>
>
> I haven't measured, so I don't really know, but I doubt it. If the top
> of
> the panel is constrained from expansion by the epoxy, what would supply
> the
> leverage to lift the crown?
>
> Ron N
>
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