R,C&S question JD

[David Love]

For the record, I am not "one of these fellows" my own residual crown goals
are different.  

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Richard Brekne
Sent: Sunday, January 27, 2008 4:58 AM
To: pianotech at ptg.org
Subject: R,C&S question JD

 

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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