to A442 & back(D)

[Isaac OLEG SIMANOT]

Hello,

The explanation make sense, but did you check it on real pins with a
magnifier glass ?

Beside, don't forget the the strings are played hard from below, only that
chock wave is enough to make the string climb a bit in the treble I believe.

I was thinking about the possibility that the string have a rotating move
that helps it go higher on the pins.

Any data available on these ?


Regards.

Isaac OLEG

> -----Message d'origine-----
> De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part
> de David Love
> Envoyé : dimanche 5 mai 2002 17:42
> À : pianotech@ptg.org
> Objet : Re: to A442 & back(D)
>
>
> I don't think it's so much that strings climb bridge pins.  Over time the
> bridge pin will wear a small notch from the string sliding back and forth.
> At the same time the termination point on the bridge gets lower as the
> bridge cap compresses (exacerbated by hard tapping down of strings on the
> bridge).  At some point, then, the string wants to ride in the
> notch on the
> bridge pin and that point is above the seating level on the bridge.  The
> lesson is that when seating strings on the bridge, tap the top of
> the bridge
> pin down a bit, not the string, to lower that notching.
>
> David Love
>
>
> ----- Original Message -----
> From: "David Renaud" <drjazzca@yahoo.ca>
> To: <pianotech@ptg.org>
> Sent: May 05, 2002 7:00 AM
> Subject: Re: to A442 & back(D)
>
>
> >     Finding this an interesting discussion.
> >
> >     Did the D this morning and it was just fine,
> > stable, was at A440. Barely moved things at all.
> >
> >     Going from A442 to A440, I had spent 1.5 hrs,
> > to make 2.5 passes the day before, It moved allot
> > through that first pass, less second, third was good,
> > but I was suspicious of how it would hold, was fine.
> >
> >     Just to clarify for some who seem surprised
> > at 8 cents causing "such" instability. We are not
> > talking about so bad as not to pass. I became
> > very fussy with this instrument lately.
> >
> >  I have been spoiled by doing this piano 16 times last
> > month, this instrument became a pet project to see
> > how far I could go refining what I do. It was
> > extreamly stable, where I wanted, and the day
> > they decided they wanted A442, I would not even have
> > had to tune it, it was in great shape.
> >
> >     I think my expectations for this piano had
> > gone up, and if we use a fine enough microscope
> > things always move a bit. I was getting spoiled,
> > and A442 meant 2 double tunings over 2 days to get it
> > up and back down when I had only booked one spot
> > , and was fully booked, with no extra time.
> >
> >
> > So I have a remaining question.
> >
> > Why do strings sometime climb bridge pins?
> > Is a flexing board enough on a big piano
> > as I have suggested?
> >
> >
> >                       Dave Renaud
> >                       RPT
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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