Rescaling questions

[ryan sowers]

Inharmonicity goes down with increased tension, all
other things being equal.

--- Joe Garrett <joegarrett@earthlink.net> wrote:

> 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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