key dip, dip in.....

[Isaac OLEG]

If the boring is made accordingly to different string height /section,
the tails have to be reshaped so they are the same length /position,
or the backchecks have to be reset.

I believe the final wish is to obtain letoff at the same height for
all notes, if going that way is not the letoff height the real
reference for boring, and not the strings height ?



Isaac OLEG


> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de David Love
> Envoyé : lundi 21 octobre 2002 09:44
> À : Pianotech
> Objet : Re: key dip, dip in.....
>
>
> If you have different string heights in each section (like
> many older
> Bechsteins, for example) then you will have different
> hammer line in each
> section to make the blow distances equal.  If the boring
> was done standard,
> then you will have different shank heights in each section as well.
>
> I will admit I've never seen a piano where the bass was
> bored the same as
> the tenor/treble.  A shank farther off the rest cushion
> will not repeat so
> well as the one set closer.
>
> David Love
>
>
> ----- Original Message -----
> From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: October 21, 2002 12:20 AM
> Subject: Re: key dip, dip in.....
>
>
> David Love wrote:
>
> > If string heights are different in all sections, why
> would you care about
> a
> > straight hammer line?  You certainly wouldn't care to
> make the hammer line
> > straight through the bass?
> >
> > David Love
> >
>
> Kind of depends on the bore length to begin with me thinks.
> If, as Petrof
> themselves say do, you vary the bore length to match string
> height you have
> a
> different situation then if you have, as in this case a
> standard out of box
> set
> of replacements... or what ? Course when the first shoe
> shine reshaper comes
> along...... :)
>
> Interesting enough point though. We see curved string
> planes dont we, and
> rather
> randomly uneven ones as well. Can make for some interesting
> hammer lines
> that's
> for sure :)
>
> Question though, as long as we are on about this. Some
> pianos have a thicker
> cushion for the hammer rest rail in the bass then in the
> rest of the piano
> to
> compensate for higher shank position there (when so
> configured). So, what
> difference would that extra 3 mm or so distance between the
> rest cushion and
> the
> shank mean ?
>
> --
> 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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