Bolduc Block - Bit Size - Torque

[Isaac OLEG]

Terry,

Without particular experience with Bolduc blocks, my thought is that
this kind of pin block gives a higher torque after a few weeks, not
the opposite.

Can someone give me some real thought on that, and why ?

Greetings


Isaac OLEG

Entretien et réparation de pianos.

PianoTech
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94400 VITRY sur SEINE
FRANCE
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Farrell
> Envoyé : mardi 17 juin 2003 14:15
> À : pianotech@ptg.org
> Objet : Bolduc Block - Bit Size - Torque
>
>
> I am stringing a piano that I installed a new Bolduc
> quarter-sawn (more-or-less) hard-maple pinblock. I am using
> Ron Nossaman's two-bit drilling method. I started out with
> a final drill size of 0.25-inch (actually the drill bit
> that Pianotek sells specifically for the Bolduc blocks - it
> is actually about 0.247-inch). I was consistently getting
> an initial torque exceeding 200 in.-lbs. I tried a couple
> larger bits that produced similar results. I have drilled
> my latest holes with a final bit size of 0.263. I am
> getting an initial torque (right after pounding the pin to
> stringing height) of about 180 in.-lbs.
>
> At 180 in.-lbs. I feel like I am at the upper limit of what
> I should be shooting for (beyond?). How much can I expect
> the torque to fall in the first month/year or so when
> things settle in? My guess is that I could go with an
> initial lower torque, but I am concerned that perhaps
> things are going to loosen up and I might be too loose if I
> use a larger bit (I'm already so much bigger that what is
> commonly recommended).
>
> The block has been in my 8.5% MC-stable shop for more than
> six months.
>
> This is only my third block that I am drilling. If I am
> going to error, I would rather error toward the upper
> limit. Both my others were about 200 in.-lbs. - YIKES! This
> is my piano - I don't want to have to tune with such a
> block - yet, loose pins do no one any good.
>
> Thanks for any constructive input.
>
> Terry Farrell
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