More CC vs RC questions was RE: Killer Octave & Pitch Raise

[David Love]

If I may try to answer my own question having read back through this
thread.  The stiffness of the panel is produced by applying whatever
downbearing is required to achieve it.  The difference being that the
ribs take the stress of supporting the bearing over time rather than the
panel and therefore the stiffness of the panel is likely to hold up for
longer avoiding the inevitable compression set if the panel were
supporting the bearing alone.  

OK.  So do you then have to compress the RC&S panel more to achieve the
same stiffness as the CC panel because the CC panel has a bit of a head
start, as it were?

And just how flat can you squash the RC&S board before you run the risk
of a problem, assuming you think you might need to squash it flat in
order to achieve a desired tonal quality.  

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of David Love
Sent: Sunday, February 13, 2005 9:05 PM
To: 'Pianotech'
Subject: RE: More CC vs RC questions was RE: Killer Octave & Pitch Raise

Not to belabor this point, but just to clarify for my own understanding
(because this point confuses me), if the ribsets support all the bearing
as if the panel wasn't there, how does the panel achieve the requisite
stiffness to do what it needs to do?

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Ron Nossaman
Sent: Sunday, February 13, 2005 8:13 PM
To: Pianotech
Subject: Re: More CC vs RC questions was RE: Killer Octave & Pitch Raise


>AHEMMMMMMM!   I believe you three are the only ones designing primarily
rib
>crowned and supported soundboards. But I do not think you three are
the
>only ones building that type!
>
>Geeeesh! I don't get no respect around here!
>
>Terry Farrell


Yea, you're right, you got me. Clumsily worded - sorry. BTW, I got one
of 
those pretty B panels you made for me ribbed Saturday with another of
those 
rib sets designed to support bearing as if the panel wasn't there at
all. 
Bridges are roughed in, laminate capped, and marked for drilling.
Tomorrow 
afternoon, I'll locate them on the soundboard with the plate, and... I'm

looking forward to hearing this one when it comes together.

Ron N

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