Grand touch

[Absolute Piano]

Ric,

I agree that maybe the hammers and/or keys may be too heavy and perhaps only in certain sections. Ideally if you could measure the strike weight and front weight, you could determine if something was out of whack even if DW, UW, & ratio look normal. Three half inch leads could mean anything depending on how much the half inch weight weighs (there are many variations) and placement. 

Jude Reveley, RPT
Absolute Piano Restoration, LLC
Boston, Massachusetts
  ----- Original Message ----- 
  From: Byeway222 at aol.com 
  To: pianotech at ptg.org 
  Sent: Thursday, July 13, 2006 11:15 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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