Rescaling questions

[Carl Meyer]

----- Original Message ----- 
From: "ryan sowers" <pianorye@yahoo.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Thursday, August 05, 2004 4:30 PM
Subject: Re: Rescaling questions


> Inharmonicity goes down with increased tension, all
> other things being equal.
>
> --- Joe Garrett <joegarrett@earthlink.net> wrote:


Squuuuuuzzzzzz me!!!!! How do you get increased tension with other things
being equal?  Speaking length for instance?

If you have a note with a particular size wire, increasing the wire size
will increase the tension and the inharmonicity assuming a plain wire.  That
is if you are tuning to the same frequency.  What kind of games are you
playing?

Carl Meyer Ptg assoc
Santa Clara, Ca.


> > David Renaud said: "to calculate rescaling.
> > Never done this before.
> >
> > What is prefered range of tension and % of breaking
> > point at various points along the scale?
> > .....this is not for the bass strings.
> >
> > Old grand or upright piano(both)
> > 160lbs average??
> >  If Inhar. goes up by increasing tension with larger
> > wire is this bad.....or is inhar good at some point?
> > How much inhar. is too much?"
> >
> > David,
> > Inharmonicity works in relation to tension. If the
> > tension goes up, so does Inharmonicity. I was told,
> > by my mentor, "do not exceed 60% of the breaking
> > strength." Many times this is not possible to
> > follow, but it's a good rule of thumb. I would
> > suggest you consider using a "loudness/impedance"
> > formula, as well. The combination of all, in,
> > hopefully, linear graphs, will give you what you
> > desire. When running a scale, I try to percieve what
> > the intent of the piano designer/manufacturer was.
> > Most of the time this is apparent, but many pianos
> > were "copy-cat" types and the "copy" got lost in the
> > translation! Doing lots of scales & putting them
> > into practice, (ie rebuilds on your stuff<G>), is a
> > big help in coming to the conclusions that will work
> > for you and the pianos you are re-whatevering.
> > Or.....you can send the scale to someone like me or
> > Del or Ron or...????? and let them figure it out.<G>
> > Best Regards,
> > Joe Garrett, R.P.T.
> > Captain, Tool Police
> > Squares R I
>
>
> =====
> Ryan Sowers, RPT  Puget Sound Chapter
> Pianova Piano Service
> Olympia, WA
>
>
>
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