SAT/Inharmonicity Observation

[David Ilvedson]

Call me weird, but I never over-pull, period, except for a slight roll
clockwise on the pitch raise.  

David I.

*********** REPLY SEPARATOR  ***********

On 6/2/01 at 8:25 PM Kevin E. Ramsey wrote:

>By the way, call me weird, but I don't like pulling wound strings more
>than five cents sharp; ever. A five cent overshoot would equate to the
bass
>being 25 cents flat. I always count on a twenty percent overshoot on the
>bass bridge. Here's how I figure it; say the bass is 18 cents flat. I
>double
>that, gives me 36 cents. Move the decimal point over one place, that give
>me
>plus 3.6 cents for the overshoot. Gets me right in the ball park every
>time.
>On the second pass, I'm doing fine tuning all the way, doesn't matter if
>it's a spinet or a grand. I've done so many pitch raises on grands that
>were
>12 cents flat, where I barely had to nudge the pins a little on the second
>pass to know it works. Of course, I have my own style of tuning, where I
>like to have the 6/3 octaves a little narrow towards the top, and a little
>wide at the bottom, so I fudge to make things sound good, with the double
>octave not beating very much at all.
>    My priorities are: Unisons-1, Octaves-2, Fifths-3, Fourths-4,
Thirds-5,
>Tenths-6, Seventeenths-7,................ You get the picture. I am NOT
>ever
>going to de-tune a good octave in order to satisfy a 17th.
>
>
>Kevin E. Ramsey
>ramsey@extremezone.com
>----- Original Message -----
>From: "Kevin E. Ramsey" <ramsey@extremezone.com>
>To: <pianotech@ptg.org>
>Sent: Saturday, June 02, 2001 7:50 PM
>Subject: Re: SAT/Inharmonicity Observation
>
>
>>     Terry, you remember the discussion we had a week or so ago about the
>low
>> tension in the lower tenor on the Yamaha GH1? One of the members came
>back
>> with figures that supported my theory of the tenor section tension being
>> dropped too low, and the inharmonicity factor was about double what it
>was
>> in the top note of the bass section.
>> Therefore, you could safely assume that the inharmonicity would
obviously
>> change  with that great a change in the overall tension of the string.
>>     On an other note; when a piano is that flat (-140c), the first time
>> through I will just pull it up to pitch, or maybe a little sharp, and
see
>> what happens when I tune the unisons. I count on two pitch raises.
>Otherwise
>> you're pulling individual strings fourty cents sharp for a differential
>of
>> 180 cents between the tuned and un-tuned notes. Scares me!
>>    I'm sure that you do things pretty much the same way, let me know. I
>just
>> said that more for the newbies who may be lurking.
>>
>>
>>
>> Kevin E. Ramsey
>> ramsey@extremezone.com
>> ----- Original Message -----
>> From: "Farrell" <mfarrel2@tampabay.rr.com>
>> To: <pianotech@ptg.org>
>> Sent: Saturday, June 02, 2001 7:32 PM
>> Subject: SAT/Inharmonicity Observation
>>
>>
>> > I serviced a 1940 Chickering Studio today. Hadn't been tuned in
>decades -
>> > very good condition. It was 140 cents flat. I did an FAC calculation
>with
>> > the strings 140 cents flat. FAC values were 10.5, 11.2, and 8.5.
Raised
>> the
>> > pitch up to A440. Figured maybe I should double check - maybe
>> inharmonicity
>> > would change. FAC values @ A440 were 8.7, 9.7, and 7.0. All decreased
>by
>> > about 1.5. I would imagine this simply follows some sort of theory,
>which
>> > obviously I have no knowledge of. Just thought some might be
>interested.
>> > :-)
>> >
>> > Terry Farrell
>> >
>> >
>>