[CAUT] Wire Stretch

[Keith Roberts]

Oh, I thought the question at hand was whether the cutting of a groove into
the bridge would cause a drop in pitch inbetween tunings. Let's see; with a
0.5mm drop of the string inbetween each tuning, the bridge cap would be cut
in two in about 8 tunings.
I agree with whoever suggested that the resistance of the board would lessen
any impact of the groove on tension.

Usually when things compact, they do so at a rate of 80% in the first 10% of
the overall time frame so the groove lowering the pitch on a regular basis
seems to me to be illogical.

Keith


On 4/30/07, RicB <ricb at pianostemmer.no> wrote:
>
> Keith, you arent reading the posts close enough.  Sorry.. but John didnt
> say anything about retuning the piano back to frequency, then figureing
> tension.  The question at hand is how to calculate a change in frequency for
> a change in deflection. If you want to retune and calculate tension...then
> fine.  But thats another matter entirely.
>
> Ric
>
> >
> > No John
> >
> > He does not just use Pythagoras' theorem just as you did.  And if you
> stop
> > up and look closely I am sure you will understand this.  When you change
> the
> > deflection you change three things... its length, tension, and
> frequency.
> > The new length you can calculate just as you did.  But that leaves you
> with
> > two unknowns... the new tension and the new frequency.
> >
>
>
> No Rick,
>
> the piano is retuned to the proper frequency after the recalulation of
> length. Then you have a bunch of things that are not unknown anymore.
>
> You really don't think a bunch of piano tooners are going to hammer a
> string
> 0.5mm down into the bridge and not tune the dang thing, do you?
>
> Keith Roberts
>
> --
>
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