Rib Layout

[David Love]

With the low end of the tenor bridge are you trying to match the distance
from the rim to that of the top end of the bass bridge necessarily?

David Love
davidlovepianos at comcast.net 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Friday, March 17, 2006 12:04 PM
To: Pianotech List
Subject: Re: Rib Layout


> When laying out a rib array, what is the basic principle for the number 1
> rib placement with respect to the bass bridge.  

I like to have the low end of the bass bridge sitting directly 
on the center of the first rib, or thereabouts.


>Similarly, is there a basic
> principle that guides the placement of the rib closest to the bottom end
of
> the tenor bridge.   
> 
> David Love

That, and the high end of the bass bridge, and the number of 
ribs under the bass bridge, are part of deciding how many ribs 
I want. I expect it's less problematic with a transition 
bridge (never tried it without), because of the angle of the 
bridge from the case side. You can extend the bridge closer to 
the rim for whatever stiffness you want with less concern as 
to where the ribs are. Without the transition, I'd want the 
low tenor sitting on a rib, at least, probably rib #2, and 
maybe extending the bridge back under the plate as well. 
Depends on the layout. There's lots of juggle, squint, and ponder.

Ron N
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