No Subject

[A440A at aol.com]

Bob  writes:

<< Am I stuck to not being able to play at speed--no Chopin or Schubert. What 
else can we try?  --no wippen helpers, at least I can't find any. And 
changing the location of the capstan, knuckle, will kill the warranty. >>

  Would they refuse to honor a soundboard fracture, or a pinning freeze-up 
because you changed the capstans?  If so, then, how much is that warranty worth?

Also: 


>>The supposedly "correct" solution is to lower the hammer weight. However, 
since the hammers are already light, I'm certain that'd kill the voice of the 
piano--and Renner says that's not good to do to their hammers.  Besides, we 
don't think we can take off enough on the hammers to get the AR down to the 5.5 
goal.<<

    The hammer weight doesn't change the action ratio.
 IMHO, the optimum hammer weight is decided by the tone, the action ratio 
then must be made to produce a well-playing action with that weight.  You may 
find that moving the stack distally by 2 mm will make everything work just fine, 
(or you may run into all kind of interference problems.) 
   You may also find room to move the whippen rail distally, rather than 
changing capstans.  This can make big improvements on some actions.  Remember, 
when you move the capstans, the change in ratio is greater inre the whippen arc 
than the key arc. Since the whippen flange center to capstan contact point is 
much smaller than the distance from the balance rail pin to the contact point, 
a 1 mm change represents a significantly larger alteration of the whippen 
ratio than the key ratio.  Moving the stack changes the ratio without altering the 
keys.  
Good luck, 
 

Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html
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