action ratios

[Isaac OLEG]

If I where to pretend that I've rebuild that kind of piano, and that
it is waiting for a customer at this moment, I would be ashamed to
throw on this professional list the kind of parameters as you throw
there.

A numerous number of people have tooken time to explain you lengthily
what it was about these hammer weight and touch weight things.

So please stop with your "much respect things" you are deteriorating
these instruments, then you sell them, and some real tech will
possibly be called by your customer once to regulate , tune and voice
the poor thing.

I see these kind of repairs so often I don't even know why I write
actually.

So if you love these instruments, find a way to learn to treat them
right, and stop to play the piano rebuilder.

If you are a hobbyist (and you are), you have nothing to do on that
list, be honest and repair the pianos for yourself. People out there
have to work.


Jeesus !

IO

> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Stéphane Collin
> Envoyé : samedi 2 novembre 2002 00:49
> À : Pianotech
> Objet : Re: action ratios
>
>
> Hello Richard.
>
> Thanks for interest.
>
> Here are my measurings on my latest Bechstein model B (2 m).
>
> 5 mm dip gives an average 25.5 mm hammer rise (linear, not
> angular, but anyway I couldn't achieve a precision
> measuring so this matters).  I assume this is a 5.1 ratio action.
>
> Sorry for WW and FW, but this piano is in very last stage
> of rebuilding, and waiting for customers, so I'm not about
> to pull the stack out of it now.
>
> But I measured KR through length between balance point and
> front key, just above the front pin (243 mm) and length
> between balance point and whippen center for the rocker leg
> (no capstan on older Bechstein) (140 mm).  This should give
> us a KR of 140/243 = 0.576
>
> Here are the other measurements
>
> note   DW    UW    SW
> C-3   60      40       8.4
> C-2   60      39       8.4
> C-1   63      47       8.9
> C0     62      39       8.3
> C1     57      36       7.3
> C2     56      35       6.5
> C3      56     32       5.8
>
> What do you think ?
>
> Greetings, and much respect.
>
> Stéphane Collin.
>
>
>
> ----- Original Message -----
> From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Friday, November 01, 2002 10:43 PM
> Subject: Re: action ratios
>
>
> | Hi Stéphane
> |
> | More parts of the puzzle to think about eh ? And this
> question was a fun one for sure. To be honest I havent
> really thought about exactly this question before.
> |
> | Perhaps if you sample some of our now standard parameters
> we might be able to see into how this may or may not fit
> into this whole question of  ratio and hammer mass.
> |
> | If you could give us the SW's, FW's WW's, KR, UW, and DW
> on say 10 sample keys we might have some fun with this one.
> And if you also could measure how far the hammer travels
> for 5 mm key travel (be very very accurate) that would be
> nice as well.
> |
> | I'm not so sure I'd buy into this being a voicing problem
> right off. I mean if the extremes are so very good then I
> have a hard time understanding that the hammers elasticity
> is involved. But I will ponder what others say with interest.
> |
> | Cheers
> |
> | RicB
> |
> | Stéphane Collin wrote:
> |
> | > Hi Richard, David, Bill, etc.
> | >
> | > I've been following the thread with much interest.
> | > May I ask an innocent but pragmatic question (I think
> related to this topic) ?
> | > More than often, I encounter this problem when
> rebuilding Bechstein pianos : I get the sound right, I get
> the touch feel ok, but the whole instrument always happens
> to be difficult to control, as the dynamic output switches
> too quickly from PP to mF (I mean :  the dynamic shades are
> not progressive enough.  Very soft playing is fantastic,
> very loud also, but progressively crossing from soft to
> loud happens to be difficult to control, as sound gets loud
> too quickly, which is musically not desirable at all).
> | > How would you all cure this problem ?
> | >
> | > Thanks to all for great expertise.
> | >
> | > Stéphane Collin.
> | >
> |
> | --
> | 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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