Soundboardcrown

[Erwinspiano@aol.com]

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In a message dated 12/17/2002 5:32:19 AM Pacific Standard Time, 
mcpiano@globetrotter.net writes:

> Subj: RE: Soundboardcrown 
>  Date: 12/17/2002 5:32:19 AM Pacific Standard Time
>  From: <A HREF="mailto:mcpiano@globetrotter.net">mcpiano@globetrotter.net</A>
>  Reply-to: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>  To: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>  Sent from the Internet 
> 
>        Marcel

              If you are using flat ribs without a precut crown this amount 
of crown sounds about right. If you had crowned the ribs some you'd have more 
crown for a longer period of time but either way you'll have a good sound. 
With what you've described just more potential for compression ridge wood 
destruction. 
    There have been many discussions on list about the pros and cons of the 
rib crown and less drying of the panel versus the strictly compression 
crowned method with flat ribs and much lowere MC on this list.
  In Peters case he seems to be greatly uninformed  as to where his crown is 
coming from so apparently he'll benifit from your post. Del is right ,he'll 
want to get the ribs off and rethink the MC content before he tries 
again.Peter I also recommend also reading some articles about the benifits of 
less panel drying etc before you put the ribs back on and risk another 
failure. Peter if you're listening ,asking the right questions on this list 
will save you a good deal of grief and contribute to your success rather than 
making the same mistakes some of us have made early in our careers making 
boards.
    I know were all here to be helpful.
     Regards   Dale Erwin

> 
> Peter,
> 
> Here are my results and procedure:
> 
> I started with ribs that were crowned to a radius of 65 feet.
> Made cauls that had a average radius of 47 ft
> Dried the soundboard to a 4.48 % MC (Moisture content)
> When I took the board out of the press, I had a crown of 45 feet
> radius; now, after a week I have 3/8" between the longest ribs (45.5")
> which gives me a radius of 57.5 feet. I'm quite happy with this crown
> (Mason &Hamlin "A").
> 
> Maybe Del will have a different opinion, and I hope he will share his
> thoughts on these figures.
> 
> Marcel Carey, RPT
> Sherbrooke, QC
> 


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