Rescaling questions

[ryan sowers]

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Joe stated that: 
> > Inharmonicity works in relation to tension. If the 
> > tension goes up, so does Inharmonicity 

I was simply stating that increasing tension on a wire actually lowers its inharmonicity. Of course, if you raise the tension of a particular note by increasing the wire size you will get a net gain of inharmonicity, but this is due to the greater stiffness of the thicker wire, not the greater tension. 



> 
> ----- 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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> 
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> 



Ryan Sowers, RPT  Puget Sound Chapter
Pianova Piano Service
Olympia, WA
		
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