Thinning Ribs (Modified by Kent Swafford)

[Richard Brekne]

Thanks Joe.

I suppose this thing should be fit to attach both to the soundboard and 
the ribs. How thick and how wide do you think this should be ?

As for downbearing.... Even if I put say a 2 degree string angle on the 
bridge... how much downbearing can we be talking about here... I suppose 
this is a good time for me to figure what John Hartman asked me to do a 
while ago.  Seems in principle simple enough. Finding the individual 
string bearing is just a matter of the length between the termination 
points the angle at the highpoint of the bridge and the tension on the 
string. Just havent gotten around to adding up 250 strings worth of it 
yet... grin.. Here there are lots less strings... but they are puresound 
and much thiner then modern strings..  In anycase... I'd kinda figured 
that the panel didnt need to be so very stiff in the face of whatever 
downbearing there will be.

Anyother thoughts out there on this ?

RicB

Joseph Garrett wrote:

> Ric,
> Here's a copy/scan of my attempt at clarification.<G> I've drawn in the
> cut-off bar and the approximate location of the bridge. My reasoning 
> for the
> cut-off bar is to put the bridge at a more equal distance between the 
> cutoff
> bar and the opposite rim. As the upper treble, on these pianos, is 
> usually
> ethereal/nasal, etc., I am theorizing that too much soundboard in that 
> area
> is partially the cause of this poor sound. The cut-off bar will reduce,
> greatly, the amount of soundboard in the direct area of the top treble.
> Also, it would help to stiffen the new ribs you've installed, thereby
> counteracting the downbearing somewhat. K?
> Best Regards,
> Joe Garrett, RPT, (Oregon)
> Captain, Tool Police
> Squares Are I
>
>
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