Foundry Castings

[gordon stelter]

According to the AS&W transcript, gray#50 is preferred
because of tremendous compressive strength, and no
harmonic resonance.
--- Delwin D Fandrich <pianobuilders@olynet.com>
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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