Agraffe reaming checking hole's height.

[Isaac OLEG]

Using a light, or a "beam spreader" on a little laser shows the
biggest differences, mostly coming from the base of the hole, not the
agrafes. But it is not a long time I check that, and it is not for
perfection, only to avoid "stairs" in the string's plane, damper lift,
and so on (more likely to arise near the break).

I had once problems with the finish (holes not protected while
spraying). I try to keep things in their original place otherwise.

Regards


Isaac OLEG

Entretien et reparation de pianos.

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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Ron Nossaman
> Envoye : dimanche 6 avril 2003 20:44
> A : Pianotech
> Objet : RE: Agraffe reaming
>
>
>
> >>That's the point. If you're re-using the original
> agraffes, and they were
> >>lined up when you took them out to ream them, how is it
> possible to not
> >>have them go back in the same threaded hole without
> lining up just like
> >>they were before they were taken out? There wouldn't be
> any need to shim
> >>or trim.
> >>
> >>Ron N
> >
> >Perhaps if you've reamed out the hole enough on some and
> not on others, so
> >the strings
> >wouldn't line up anymore? Then you'd need to shim the
> less-reamed ones, so
> >that even if the tops of the agraffes weren't totally
> level, the strings
> >would be?
> >
> >Susan
>
> Then I'd say it's time to find a less destructive reaming
> method. You'll
> easily change string height more than reaming will, just by
> leveling
> strings after it's strung. I don't think it's a real
> concern. But it does
> bring up a valid point. Who actually tries to measure and
> adjust to a few
> thousandths (with shims), the final height of the agraffe
> holes? Not the
> tops - the holes. This is one of those things that's given
> a fair amount of
> lip service about how critical it is to so many decimal
> places, but does
> anyone out there actually worry about anything other than
> gross mismatches?
> If so, how do you measure agraffe hole height? Eyeballing
> new agraffes to
> reject the obviously mis-drilled ones, we see that the
> state of the art
> isn't all that dependable and precise. We see mis-drilled
> agraffes in new
> pianos when we are trying to get dampers to work, and clear
> up the truly
> bad phasing noises by leveling strings. So what good is
> leveling the tops
> of agraffes when the holes could be anywhere?
>
> Ron N
>
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