Killer Octave Question

[Farrell]

Bent, kerfed, and epoxied? Who said anything at all about that? I don't understand what you are referring to.

Terry Farrell
  
----- Original Message ----- 
From: "gordon stelter" <lclgcnp@yahoo.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Monday, April 14, 2003 1:18 PM
Subject: Re: Killer Octave Question


> No! It makes no sense! I leave it to you to build a
> bridge that is kerfed on the underside, bent to fit
> the board and then filled with epoxy!
>      Thump!
> 
> --- Farrell <mfarrel2@tampabay.rr.com> wrote:
> > I've done some playin' and some tinkin'. And I've
> > decided that there is a difference between a crowned
> > bridge, but that the difference, in practical terms,
> > is negligent.
> > 
> > If you cut a circle out of cardboard one foot in
> > diameter, and then cut a circle out of the middle of
> > that, let's say eight inches in diameter, you have a
> > big flat donut. Set that donut on a basketball so
> > that it sets like a topless hat. Now also realize
> > that you need about a foot of tangent coming off the
> > donut at some point (low tenor or long bridge). Now
> > you can see the argument for a crowned bridge. Or
> > perhaps not really just a crowned bridge, but a
> > bridge that has a bottom bevel in the treble area
> > and a crown in the lower tenor.
> > 
> > Now back to reality. Soundboards, even Fandrich
> > soundboards, have a larger crown radius than a
> > basketball, and a bridge is only 32 or 35 mm wide.
> > So I do suppose that the ribbed soundboard panel and
> > bridge itself will conform quite readily to the very
> > slightly mis-matched straight bridge and curved
> > soundboard panel. The tenor end will bend enough
> > (what, maybe 1 mm) and the treble section of the
> > bridge can have a top whose plane is not quite
> > parallel to the plane of the bridge bottom/panel top
> > interface. Bottom line: any difference is close to
> > or wholly within common woodworking error and
> > completely negated by the flexibility of the woods.
> > 
> > That make sense?
> > 
> > Terry Farrell
> >   
> > ----- Original Message ----- 
> > From: "Ron Nossaman" <RNossaman@cox.net>
> > To: "Pianotech" <pianotech@ptg.org>
> > Sent: Sunday, April 13, 2003 12:02 AM
> > Subject: Re: Killer Octave Question
> > 
> > 
> > > 
> > > >FWIW: I just cut a long bridge out of an old
> > Mason & Hamlin and it is as 
> > > >flat as a pancake. Not a speck of crown to be
> > found.
> > > >
> > > >Terry Farrell
> > > 
> > > You can tell? How tragic. One of the points I try
> > to illustrate in my 
> > > bridge building class is the difficulty in
> > determining whether or not the 
> > > original bridge was crowned, and how important it
> > is to the assembly. An 
> > > old Knabe bridge, lying on a table and propped up
> > in the middle with a 
> > > pencil, shows a lovely crown from end to end. Pull
> > the pencil out, and it's 
> > > dead flat. That bridge will lay on a crowned
> > soundboard and very nicely 
> > > conform to the crown of the board.
> > > 
> > > Ron N
> > > 
> > > _______________________________________________
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> > pianotech list info:
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> 
> 
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