Soundboard Compression & Cracks

[Richard Brekne]

Farrell wrote:

> Take a compression-crowned soundboard that is not collapsed (still has some
> crown) that also has a few cracks through which you can see daylight. How
> can this be? The only thing that gives the board crown is the lateral
> compression across the grain as the wood gained moisture after its initial
> drying during construction. Now if you have daylight cracks in the board,
> does this not mean the board is not under compressional forces? Or is it
> that the inter-crack areas are still under compression from being glued to
> the non-dimensionally changing ribs (relatively speaking)? But then why/how
> is it that one area of the board can be under compression and an inch or two
> away, the board is under tension????????
>
> What is it about the soundboard that is soooooooooo interesting? Or is my
> life just that dull?
>

Smile.... from the sound of your recent array of posts I doubt seriously its the
later.

>
> Terry Farrell

--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no