[pianotech] Guidance on Pressure Ridges and Cracks

[Ryan Sowers]

Unfortunately, the archives are not available until all the details of
transferring to the new server are worked out. Hopefully it won't be too
long!


--- On Sun, 12/28/08, erwinspiano at aol.com <erwinspiano at aol.com> wrote:

> From: erwinspiano at aol.com <erwinspiano at aol.com>
> Subject: Re: [pianotech] Guidance on Pressure Ridges and Cracks
> To: lmha60 at yahoo.com, pianotech at ptg.org
> Date: Sunday, December 28, 2008, 4:04 PM
> ? Hi Lyn
> ? This list has discussed this one issue perhaps more than
> any other as well as related techniques to soundboard
> construction. Check our archives under these titles &
> see what comes up. You should be busy reading for many
> weeks. grin. The short version is..... that pressure rdges
> are a bi-product of an old school soundboard making
> method?called compression which exceeds the elastic limit of
> the wood under a compressive force. The cracks come later
> (usually)after years of climate cycling.
> ? Dale Erwin
> ?WWW.Erwinspiano.com
>
>
>
>
>
>
> Dear PTG,
>
> I inquired recently on pressure ridges and cracks with
> respect to piano
> soundboards. I have received some very valuable
> information, but I would
> like to investigate the differences between the two further
> and also be able
> to understand the mechanics of both. I have found more
> information on the
> internet about pressure ridges being caused from mistakes
> made by the
> manufacturer during the dying process.
>
> My specific question: Is there a book the PTG recommends
> that discusses
> pressure ridges and cracks of piano soundboards?
>
> I have Arthur Reblitzes book on servicing, tuning and
> rebuilding and Larry
> Fine's book called the Piano Book and neither of them
> discuss the
> information I am looking for.
>
> Thank you for your time.
>
> Lynn Michael Hall
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