Front Rail Felt Theory

[Joe & Penny Goss]

Ron,
It helps alot to shed just a little light on this murky subject.
Thanks  a hole bunch!!!!!!!!<G>
Joe Goss
imatunr@srvinet.com
www.mothergoosetools.com
----- Original Message -----
From: "Ron Nossaman" <RNossaman@KSCABLE.com>
To: <pianotech@ptg.org>
Sent: Friday, December 07, 2001 6:40 AM
Subject: Re: Front Rail Felt Theory


> > Is there any rhyme or reason for a billion
> >different sizes? Or are different sizes made simply because the
> >manufacturers can sell them. And folks that are bothered by these things
sit
> >in misery while they wonder in frustration: why?
> >
> >Terry Farrell
>
> Oh, that's simple. Just look at all the different sizes of key bushing
> cauls that are necessary to fit all the different sizes of key pins that
> have been used in the last 150 years. There used to be a formula, seldom
> acknowledged, involving the average of the diameters of the front and rear
> pins (measured front to back and side to side to account for ovularity),
> divided by the straight line distance of the tips of the pedals from the
> key overhang (if there is one), times the standardized speaking length of
> C-8. This figure is then multiplied by the logarithm of the ratio of
> overall piano height, to overall length front to back (this is why you
tend
> to see larger diameter punchings in grands), and marinated in a highly
> proprietary constant that curiously shrinks the punching dimension to fit
> the requirements of the piano. How this constant was arrived at has never
> been divulged, but it has been long suspected to involve certain species
of
> mushrooms. The present abundance of apparently arbitrary combinations of
> diameters, thicknesses, densities, and colors, merely indicates the
> continued reliance upon and availability of these mushrooms. That is also,
> incidentally, why the punchings should be kept under the keys where it is
> relatively dark, and protected by the layers of accumulated loam.
>
> I hope this is of some help.
>
> Ron N