[pianotech] Chickering Grand Hammer Flanges

[Bruce Browning]

I would anneal the plates, regardless, as they have a tendency to snap in
the middle if tightened off centre, by accident of course.

On 27 July 2011 01:25, Joseph Garrett <joegarrett at earthlink.net> wrote:

> Ron said: "This will give you the numbers. Sometimes the Internet is
> actually good
> for something.
> http://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html
>
> Brass expands more. So as you heat the things up, the steel screws
> should get looser in the brass, then tight again as everything cools.
> I'm not sure it's been satisfactorily determined whether the whole
> annealing process is worth the trouble though."
>
> Ron,
> Thanks. That does gives some "numbers" to the question. Not sure if the
> numbers tell me anything more than brass expands a lot more than steel.<G>
> My "gut" tells me to get rid of the flanges, but IF the annealing process
> gives them a new life, (which they have had for 100 years now.), it would
> be a whole lot less hassle to keep them. Of course, I must think of the
> "Long Term" implications as well. Hmmm? I've seen good results with
> annealed brass rails. The fellow that does them has done the rails with and
> without the screws and plates attached. He hasn't found there to be any
> difference, although he did add: "so far".<G> Things to think about for
> sure.
> Joe
>
>
> Joe Garrett, R.P.T.
> Captain of the Tool Police
> Squares R I
>
>


-- 
Bruce Browning
The Piano Tuner
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