action centers

[Isaac sur Noos]

Hi Philip, I agree on all the points you raised !

Best regards - good method to use the hole as a reference by the way ,
while I am unsure if measuring as is recommended (23mm) is not taking
more in account the actual resistance of the flange during the move
(torque) while measuring nearer the center exacerbate probably the
start friction, is not it ? as the gram gauge have a max strength
needle they keep in "memory" the highest number.

I am not raising Renner parts higher than they should, just making the
comments you gave answer to.

If I know I will have to weigh off, a good center control is necessary
of course. If not , by feel/look, whatever is often enough to catch
where problems are too evident.

Isaac

> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Phillip Ford
> Envoye : jeudi 15 janvier 2004 03:19
> A : pianotech@ptg.org
> Objet : RE: action centers
>
>
> I do exercise the centers before taking a measurement.
>
> Also, according to the Renner drawing that you provided
> some time ago, if
> I'm interpreting the drawing correctly, the 2-3 g is at a Messpunkt
> (measuring point) from the center of 23 mm.  This is near
> the end of the
> flange.  I measure next to the screw hole because that is a
> better defined
> point that is more repeatable for me, so my measurement
> should be higher.
>
> The point was that the numbers are not consistent from part
> to part.  On
> this latest set, the measured values for this particular
> center over 88
> wippens ranged from almost 0 (zero) to 10 grams.  I
> consider this an
> unacceptably wide range for fine work.  And this is not an isolated
> case.  The last several sets of wippens and shanks and
> flanges that I have
> used have had this kind of variation.
>
> Phil Ford
>
> At 03:27 PM 1/14/2004, you wrote:
> >Hello,
> >
> >Renner spec. for the flange pin is more 2-3 g, that is may
> be why you
> >find these values. when they are exercised the action
> center will free
> >a tad, so it may be a good idea to move them back an forth
> a few time
> >before really using the gram jauge.
> >
> >Best regards.
> >
> >Isaac OLEG
>
>
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