Cut off bars, was Re: Unusual rib structure?

[David Love]

Then it is typical to leapfrog the cutoff bar over the ribs?  I thought on
the picture of Del's belly braces/cutoff bar that the cutoff bar was flat. 
Is the feathering of the ribs always designed so that there is an equal
feathered length on opposite ends?

David Love
davidlovepianos@earthlink.net


> [Original Message]
> From: Ron Nossaman <RNossaman@cox.net>
> To: Pianotech <pianotech@ptg.org>; <davidlovepianos@earthlink.net>
> Date: 5/7/2003 9:51:59 PM
> Subject: Re: Unusual rib structure?
>
>
> >I noticed, the other day, on a Hamburg Steinway C, that the cutoff bar
was
> >notched to allow for the feathered part of the rib to extend beyond it to
> >the rim.  Is this counterproductive?  Generally, with cutoff bars do the
> >ribs terminate at the cutoff bar?
> >
> >David Love
>
> A big area of panel unsupported by ribs outside the cutoff will buckle
with 
> humidity swings. It's not acoustic, just administrative.
>
> Ron N