compression vs. rib crowning -automatic lowering

[Isaac OLEG]

Hello Richard,

Automatic lowering is certainly not necessary. We need front bearing
to have a nice tone, if there is not and we compensate with rear
bearing we tend to push the bridge even farther in direction of it's
rolling condition.

I've find the tone with mostly back bearing to be very strong but not
classy.
Beside, we need to push on the board to get some adequate bearing, but
the minimal side of the bearing seem more musical to me (even if a
little thin of course).

A good solution for the bass bridge is to shave a new slant in the
bridge and change the pins, then we can have some adequate pressure on
the front side.

A friend of mine have unglued the treble side of a board, and glued it
back a little farther towards the center, helping the crown to show,
he said me it worked, but I did not hear the instrument myself.

For me, new bridge pins and chiseling the termination point have
always worked (but take some time to be done)

Installing a rod under the capo bad to gain a good termination and add
some front bearing seem to be a good point too.

The agrafes can be seated lower too, nowadays, it is useful to check
their height precisely, as a few mm are fast there.

I definitively opted for the measuring of the strings in any section
for hammer drilling accordantly. This helps a lot ,as many plates are
not as horizontal as we believe.


Best Regards


Isaac OLEG




Isaac OLEG

Entretien et reparation de pianos.

PianoTech
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FRANCE
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Richard Brekne
> Envoye : mardi 11 mars 2003 19:23
> A : Pianotech
> Objet : Re: compression vs rib crowning
>
>
>
>
> Brian Trout wrote:
>
> > Hi Richard,
> >
> > Something that came to mind when I read your post...
> >
> > You're in Norway.  Would the Steinways that you see be
> New York Steinways or
> > Hamburg Steinways?
> >
> > They may not be built the same way.
> >
> > Just a thought.
> >
> > Brian T.
>
> Well,,, its true that I see mostly Hamburgs as far as
> instruments from after the
> 60's go. But there was a period there just before / during
> and after the war
> that Hamburg wasnt really producing much... for obvious
> reasons, and so we have
> actually quite a few NY Steinways from that time around.
> Also well before the
> war there are some number of NY Steinways here.
>
> Personally, I think the reason they do so well here has to
> do with our climate.
> We rarely get much above 65% RH and only for very short
> periods of time when we
> do. And each winter we are well on the dry side of things.
> Heated rooms are down
> about 25% even here on the coast. Inland things can get a
> good deal drier.
>
> The boards dont have a chance to experience much more then
> the crowning
> compression (damage, it thats what it is) and are for at
> least over half the
> year well under the 50% RH mark. Compression set of course
> will run its
> course... but we see boards here that still have useable
> crown, and reasonable
> sustain times in all ranges.
>
> I have run into a few rebuilts that havent done so well....
> and not just
> Steinways... but this probably has more to do with the
> automatic lowering of the
> plate some rebuilders subscribe to me thinks.
>
> Cheers
>
> RicB
>
> --
> Richard Brekne
> RPT, N.P.T.F.
> UiB, Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
>
>
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