Soundboard Clamping for Downbearing

[Farrell]

Oops! I was wondering where that post went when my computer crashed! Completed post was also sent.

Terry Farrell
  
----- Original Message ----- 
From: "Farrell" <mfarrel2@tampabay.rr.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, December 21, 2002 10:15 AM
Subject: Re: Soundboard Clamping for Downbearing


> 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
> >  
> > 
> > 
> > 
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