R,C&S question JD

[Richard Brekne]

Hi JD. 

I think David Love counts himself as one of these fellows.  I point you 
to the following post made earlier in the present discussion... thats 
where I get the figure of 25% remaining crown. Of course no one as 
specifically said that  such short ribs with such tight radii are 
pressed so low... but glance at the post and you'll see where my querrie 
comes from.

http://ptg.org/pipermail/pianotech.php/2008-January/216264.html

I'd agree with your last paragraph below... along with rib dimensions 
and expected amount of residual crown after downbearing is applied.

Cheers
RicB



        At 09:38 +0100 27/1/08, Richard Brekne wrote:

         >...there is a stated goal of applying enough downbearing so
        that 25
         >% of the unloaded crown remains after stringing.


    First of all, I won't question this figure simply because I haven't
    time to trawl the archives for a statement to this effect, but it
    would be good to have confirmation from one of the practitioners that
    this is so.  It seems unlikely if I'm not mistaken in what follows.

    I think it would be useful first to have a true figure from one of
    the RCS-heads for the radius of curvature  of the belly at a point
    where the rib is say, 1 metre long instead of the extreme cases given
    by Terry F. and Ron N.
    ....

          JD
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