[pianotech] regulating backchecks?

[Mike Morvan]

Jim,
    Your email reply confuses me. Chris has developed a "Virtual Keybed" which duplicates the keybed out of the keybed. He also has a long and short version of his hammer hanging and hammer squaring (at strike) fixture, perhaps that is where the confusion lies. Good luck. Mike
  ----- Original Message ----- 
  From: jim ialeggio 
  To: pianotech at ptg.org 
  Sent: Wednesday, July 29, 2009 2:07 PM
  Subject: Re: [pianotech] regulating backchecks?


  Hi Mike,

  Following discussions with Chris 6 month ago when I was helping him come up with a way to make version 1 of the string height template,  I constructed my own version of the virtual keybed.  

  The concept has excellent possibilities, except for 1 glaring problem which I have yet to solve.  That is that the "Virtual Keybed" does not even try to duplicate the keybed, but rather it is instead a full keyboard long  "Virtual String Plane".  

  A "Virtual String Plane" has excellent possibilities, but only if the actual keybed plane, ie the suface that the keyframe sits on, matches the piano exactly. ALas, that is a tall order which I have not been able to achieve yet.  Small discrepancies in the key bed eat up all that efficiency of working on the bench as you go back into the piano and do everything over again...and again..and again.

  What I really want is a reliable protocol to prove that the bench top keybed is precisely matching the piano's keybed.

  Any ideas out there?  

  I have not found setting the key height in the piano and duplicating that on the bench succesful.  The closest I got was to set some same dips and hammer strike heights across the board,  reproducing them on the bench.

  My current thinking, though,  is that it takes so much time to fuss with fine bench regulation that has to get redone in the piano anyway, that its worth it to come up with body freindly, efficient in the piano regulation.  At least that's how I feel for the next 10 minutes..(G)

  Jim I


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