1999 Steinway L with heavy action

[Isaac OLEG]

Mark, David, thanks for providing us all these nice charts and
numbers.

Even out of the weight context I noticed that you said you have 11.4
mm dip, no way to have a normal touch with such a large dip, if the
blow is 46 mm you have an unusual too low leverage, or way to much
aftertouch to be cool (the jacks are stopped in the felt in the lever
window)

If the leverage is low may be you should have a look at the whippen
rail, is it shimmed under the top of the flange with cardboard, giving
you a very large spread ? It can be used as an artifact to compensate
for too heavy hammers.

The rollers position of course plays a prime importance in the
evenness of feel.

I have seen some Hamburg actions fitted with papering (shimming) under
the whippen flange, but most often in the 70's. the stacks actually
are more precise I guess.

I am very interested in seeing what the graphs shows at last (indeed
the UW/DW sample give us yet a lot of information (friction, BW)

I'll provide you soon information's for a little Grotrian Steinway
(without assist springs) .

I find these analysis fabulous.

Best regards.


Isaac OLEG

Entretien et réparation de pianos.

PianoTech
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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Mark Davidson
> Envoyé : samedi 7 juin 2003 20:55
> À : Pianotech
> Objet : Re: 1999 Steinway L with heavy action
>
>
> > Mark,
> >
> > How about 88 Strike Weights?  We'd get so much more
> information that's
> > useful.  If you send us 88 Strike Weights I'll make a
> nice analysis graph
> > set to share with the group...
> >
> > David Stanwood
>
>
> Here they are, along with some other info.
>
> Key ratio is quite consistently near .52 (.507 to .525 on the ones I
> measured, average .517)
> No evidence of any intent to graduate from bass to treble, etc.
>
> Capstan line appears to be quite straight (checked with
> straight edge)
>
> Wippen weight measured at cushion is about 15.5g (15.4 to
> 16.0 on the ones I
> measured, average 15.5)
>
> Key dip .45"/11.4mm
>
> Blow distance 1.80"/46mm
>
> 17mm knuckles, but these are not particularly straight.
> Flipped up hammers
> and checked with straight edge and
> saw as much as 1mm obvious difference between adjacent
> knuckles (checked the
> letoff side).  Definitely not as straight
> as capstans.
>
> Strike weights (hammers have never been filed, so this can
> be taken as
> original factory weight):
> 10.3
> 11.1
> 11.1
> 10.9  C1
> 10.8
> 10.8
> 10.8
> 10.7
> 11.3
> 11.0
> 10.6
> 10.7
> 10.8
> 11.0
> 10.9
> 10.7 C2
> 10.7
> 10.5
> 10.5
> 10.9
> 11.0
> 10.7
> 10.4
> 10.7
> 11.0
> 10.5
> 10.4
> 10.2 C3
> 10.2
> 10.5
> 9.9
> 10.2
> 10.1
> 10.2
> 9.8
> 9.7
> 9.6
> 9.8
> 10.0
> 10.3 C4
> 10.4
> 10.5
> 10.6
> 10.6
> 10.4
> 10.0
> 9.9
> 10.0
> 9.8
> 9.6
> 9.6
> 9.7 C5
> 9.5
> 9.4
> 9.5
> 9.4
> 9.4
> 9.3
> 9.3
> 9.3
> 9.5
> 9.2
> 9.0
> 8.8 C6
> 8.9
> 8.4
> 8.3
> 8.3
> 8.2
> 8.1
> 8.1
> 7.6
> 7.7
> 7.8
> 7.5
> 7.3 C7
> 7.2
> 7.0
> 6.7
> 6.9
> 6.9
> 6.6
> 6.7
> 6.5
> 6.4
> 6.5
> 6.2
> 6.0 C8
>
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