Overshoot -- Pitch Raising

[Kevin E. Ramsey RPT]

I haven't noticed anything out of the ordinary with Hamiltons. They seem to
tune up about the same as most uprights. But then again, I don't really
subscribe to the plate compression theory, I'm more of a "crush the crown"
theory kinda guy.
----- Original Message -----
From: "Delwin D Fandrich" <pianobuilders@olynet.com>
To: <pianotech@ptg.org>
Sent: Thursday, December 21, 2000 8:32 AM
Subject: Re: Overshoot -- Pitch Raising


>
> ----- Original Message -----
> From: "Ron Nossaman" <RNossaman@KSCABLE.com>
> To: <pianotech@ptg.org>
> Sent: December 19, 2000 12:22 PM
> Subject: Re: Overshoot (was Re: Young Chang bridge pins)
>
>
> > >Are you indicating heavy plates has something to do with that activity?
> If
> > >so, what visible signs might show a plate to be heavier than others?
> >
> > I think so. Since there is pretty conclusive evidence from Dr Sanderson
> > (and others) that the majority of that pitch drop is from plate
> > compression, and some supportive shade tree logic and soundboard
> deflection
> > math of my own that supports it too. Strut placement and such would
> > probably make differences too and, as Don said, full perimeter plate,
but
> > in general, thicker iron bends less under a given load. Nothing here
> that's
> > convertible to numbers exactly, just a general fudge factor to consider.
> --------------------------------------------------------------
>
> Ron,
>
> Interesting comments.  Now, I haven't tuned any pianos in, probably, 15
> years and memory fades -- mercifully -- over time but I've a question
here.
> And even when I was tuning most everything was a grand of some sort.
>
> Now, I've also heard the theories about plate compression during pitch
> raises and have wondered... What is your experience pitch raising pianos
> such as the Baldwin Hamilton? These have to be the lightest plates in the
> business. Still, I don't hear many horror stories about either tuning them
> or pitch raising them. What say you?
>
> Del
>