The Soundboard bit.. RC&S / Steve B

[RicB]

Hey there Steve.

Actually... a lot of the confusion comes from the use of just RC and CC 
as abbreviations.  RC boards can have so much compression in them as to 
be more or less the same as a CC board.... or so little as to become in 
reality a RC & S board.

But to be more specific... the CC term is widely used to describe a 
board that has flat ribs (flat side glued to the soundboard that is) and 
relies entirely on the stress interface between the compression built up 
in the panel as it takes on humidity and tries to expand against the 
ribs tensioning against it. The whole assembly then bends... or crowns 
if you will.

I suppose we could use  RC & CS,   CC & CS, and RC & RS for more 
clarity... but it seems weve settled on CC, RC, and RC & S instead.

Cheers
RicB



    Hey Now,

    Thanks Ric, I think I get the compression thing on a very basic level of
    course. I was confused about the RC vs RC & S. An earlier post in this
    bundle used the term Rib Crowned and Supported (RC&S). I was and am
    following the thread with great interest and learning alot. Thanks
    for the
    info.

    Steve

         >
         > Hi Steve.
         >
         > RC simply means the ribs themselves are crowned.  It says
        nothing about
         > how much compression in the panel is use to also support
        crown against
         > the downbearing of the string plane.  RC & S clearly
        specifies that the
         > crowned ribs are doing nearly all that job.  The only
        compression in
         > that kind of board is present to work against the tendancy of
        a board to
         > pull apart during dry periods.
         >
         > If you dont understand what compression is about then you are
        going to
         > need a more thorough explanation.  But there is tons of stuff
        in the
         > archives about it.
         >
         > Cheers
         > RicB