Soundboard Clamping for Downbearing

[Farrell]

Sounds to me like you are headed in the right direction. One thing that caught my eye and I though good to point out in case someone else does not. You wrote:

"....and placing new crowned ones, drying the board and the ribs carefully to a MC as low as possible and then gluing and clamping them together."

Drying the board as low as possible will mean death of the board. DO NOT DO THAT. Depending on a host of factors, most of which are beyond my expertise, you will want to bring the board to an EMC of between 5% and 6%. My understanding is that if you are going compression

  
> So if you want to know, I'm going to restart, ie taking of the ribs
> whith a plane and placing new crowned ones, drying the board and the
> ribs carefully to a MC as low as possible and then gluing and clamping
> them together.
> The "only" problem I still have: how much crown should I give to the
> beams of my press: none, and arc of +/-18m for the longest ones and
> +/-15 for the shortest ones, (like the ribs are precrowned),  +  for
> having  more  crown at the end?  (How much should one have with a new
> board anyway?) Can somebody me tell that please?  I only know that the
> uncrowned beams of my press give about one cm of crown when I'm blowing
> the hoses. 
>  
>  
> I also want to thank all of you who have discussed this item.  Do not
> think I feel blamed but it was hard at some points.  I have learned my
> lesson and made my conclusions that you can read above.  But I think
> this was the money I have to pay for.  And after all, in doing 15 years
> of restoration of piano's, I have only to restart 2 times a job.  I
> think that's not bad.  And also, making soundboards, I love it more and
> more.
>  
> Peter
>  
> 
> 
>