Foundry Castings

[gordon stelter]

Internal damping is good becasue we don't need a plate
with any portion of it having a specific resonance
augmenting a specific partial series, right? Broadwood
used steel on their "barless grand" why not ask them
why it is no longer built?
--- Newton Hunt <nhunt@optonline.net> wrote:
> Sure it has a lot to do with why it is in pianos. 
> If it were hard to
> machine and if it was expensive it would not be in
> pianos.  The other
> reason is that it has proven it's merit for our
> purposes and those who
> chose a different material have ended up regretting
> it.  I am sure there
> were lots and lots of plate failures before they got
> the specs right.
> 
> Lots of luck.
> 
> 		Newton
> 
> > Delwin D Fandrich wrote:
> > 
> > And If I haven't created enough confusion yet,
> I'll toss out another
> > one:
> > 
> > Just why do we think gray iron is the best of all
> possible materials
> > to use for piano plates anyway? What is it about
> gray iron that is so
> > special?
> > 
> > We say it is extremely rigid -- but it is not.
> It's brittle. Is this
> > an advantage?
> > 
> > We say it has excellent internal damping
> characteristics -- but is
> > this an advantage? Why?
> > 
> > Right off hand I can think of only two
> characteristics that make it a
> > particularly good choice for piano plates: [1] It
> is easy to machine
> > and [2] it is cheap. Neither of these has anything
> to do with its
> > performance in the piano.
> > 
> > Del
> > 
> > 
> >
> 


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