Crown on Compression Boards

[David Love]

So the equivalent of about a 60'radius?  Will the smaller ribs of the upper
end of the piano, then, yield a tighter radius when forced into bending mode
or is it about the same proportionately?

 

David Love
davidlovepianos at comcast.net 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Erwinspiano at aol.com
Sent: Monday, May 08, 2006 1:27 PM
To: pianotech at ptg.org
Subject: Re: Crown on Compression Boards

 

  Hi David

  I don't know any one doing straight compression crowning but my guess is
that it might yield approx 6 to 7 mm crown on a long rib...say 40inches.
Guess sit depends on how dry things got before ribbing.

  Dale

Question for those of you who do straight (or pretty much straight)
compression crowned boards.  What kind of crown do you typically see on your
boards before they are loaded?  Please give me a rib length (approximate is
ok) as well as the amount of crown (mm preferred).  

Small research project.

Thanks

David Love
davidlovepianos at comcast.net 

 

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