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#642672 - 01/08/09 12:24 PM Inharmonicity targets
lorkoe Offline
Junior Member

Registered: 02/18/08
Posts: 17
Loc: Manitoba, Canada
When re-stringing, what inharmonicity numbers would you use as targets in the various ranges of the piano? How do you keep a balance between iH and tension (BS%) when doing the calculations? Do you just try to keep the tension fairly consistent and then check that the iH is reasonable?

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#642673 - 01/08/09 03:15 PM Re: Inharmonicity targets
delacey-simms Offline
Full Member

Registered: 08/14/08
Posts: 114
Loc: Kirkbymoorside N.Yorks UK
Note the original tensions when removing the old strings, the average tension in every section should be the target tension of each replacement string in that section, the tensions can be adjusted slightly so one section runs smoothly into the next. The common trend is that it creeps up towards the bass but is quite level in the treble. Don't worry about iH, an even tension is key.
_________________________
delacey-simms
piano tuner, technician and enthusiast.
All my comments are posted with the utmost respect to the other technicians

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#642674 - 01/10/09 02:51 AM Re: Inharmonicity targets
Gadzar Offline
2000 Post Club Member

Registered: 12/15/06
Posts: 2101
Loc: Mexico City
In order to note the original tensions: How do you know the tension in a string? Do you measure it?
_________________________
Rafael Melo
Piano Technician
rafaelmelo@afinacionpianos.com.mx

Serving Mexico City and suburbs.

http://www.afinacionpianos.com.mx

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#642675 - 01/10/09 02:04 PM Re: Inharmonicity targets
lorkoe Offline
Junior Member

Registered: 02/18/08
Posts: 17
Loc: Manitoba, Canada
Gadzar, I was wondering about that too. I would still be interested in knowing when the iH numbers are too high. Surely there must be some sort of rule of thumb.

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#642676 - 01/10/09 10:54 PM Re: Inharmonicity targets
Dale Fox Offline
1000 Post Club Member

Registered: 10/17/04
Posts: 1107
Loc: Nor California Sacramento area
ALgebra.
_________________________
Dale Fox
Registered Piano Technician
Remanufacturing/Rebuilding

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#642677 - 01/10/09 11:00 PM Re: Inharmonicity targets
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22607
Loc: Oakland
I posted an Excel template a long time ago.
_________________________
Semipro Tech

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#642678 - 01/11/09 08:15 PM Re: Inharmonicity targets
lorkoe Offline
Junior Member

Registered: 02/18/08
Posts: 17
Loc: Manitoba, Canada
I understand how to calculate the iH but that doesn't tell me if these numbers are "out of range". That's what I'm looking for.

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#642679 - 01/11/09 09:30 PM Re: Inharmonicity targets
Gene Nelson Online   content
1000 Post Club Member

Registered: 09/10/04
Posts: 1622
Loc: Old Hangtown California
If you purchase PScale from Tremaine Parsons, http://www.goptools.com/ the scales of several pianos are in there as examples. If you open them onto the graphic display, inharmonicity and tension guidelines are drawn in and you can see how your scale fits.
These guidelines were arrived at by measuring and plotting many scales and then finding out that most scales will fall within these guidelines or close to it.
You can calculate iH for a note but it really has no meaning until you can see how it compares with the other notes.
As tension and iH change oppostie from eachother, (in general - within limits) it is the tension that is more important for tone and iH for tuning.
If the tuning cannot be smooth and even but the tone can, this is the better choice in my opinion.
_________________________
RPT
PTG Member

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#642680 - 01/11/09 09:43 PM Re: Inharmonicity targets
David Jenson Offline
2000 Post Club Member

Registered: 10/22/06
Posts: 2395
Loc: Maine
"I posted an Excel template a long time ago." BDB

A belated thank you for that. I pulled it down, and have had a good time evaluating the scales of a couple of rebuilds with it. Nothing major had to be changed, but it was interesting to see how well the original designers had done (Chickering and Mason & Hamlin "A").
_________________________
David L. Jenson
Tuning - Repairs - Refurbishing
Jenson's Piano Service
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#642681 - 01/12/09 12:15 AM Re: Inharmonicity targets
BDB Online   content
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 22607
Loc: Oakland
That is odd. I did quite a bit of changing on my A. I felt justified, as I have seen quite a number of different scales printed on different As.
_________________________
Semipro Tech

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