Grand touch

[Joseph Alkana]

And the condition of the knuckles is...?
Hammer flange pin to knuckle distance is...?
Action spread is...?
Where is the capstan as regards the magic line at half blow...?


Joseph Alkana RPT
  ----- Original Message ----- 
  From: Byeway222 at aol.com 
  To: pianotech at ptg.org 
  Sent: Thursday, July 13, 2006 8:15 AM
  Subject: Grand touch


  Hello List,
  It has been fascinating reading the posts on inertia, initially sparked off by my original posting on the Petrof action I am dealing with.  Unfortunately I still don't have any further clarification as to whether inertia is the problem.  I have been back to the piano and checked certain areas which I had not previously been able to do.  If I could reiterate, the situation is:-

  A Renner action in a 12 year old Petrof concert grand which feels heavy and tiring to pianists.
  The D/W  average is 48g and U/W average 28g. Action ratio around 5.5
  The regulation is not perfect but is good.
  The damper pick up point is right.
  The keys are not binding at the balance point or at the capstan.
  The key weighting goes from 3 half inch weights in the bass through a (curious) tenor octave of 4, then to 2 and 1.  Obviously, the positioning of weights is crucial but without photos I can only describe the positioning as not looking unusual in any way.
  I noticed that the whippens are the Renner design to take a helper spring.  I don't see evidence though, that a set of springs or looped flanges has been removed. They are usually just unhooked if a technician decides against them.

  So, given that friction does not appear to be a problem in the general feel of the action, what would be your next steps in solving the problem.

  ric

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