Thar She Blows!

[tune4u@earthlink.net]

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Thanks for a lesson that I will copy into my notes. Thanks to all who
responded.

Alan Barnard
  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
Behalf Of BobDavis88@aol.com
  Sent: Tuesday, May 20, 2003 10:44 AM
  To: pianotech@ptg.org
  Subject: Re: Thar She Blows!


  In a message dated 5/19/2003 7:31:39 PM Pacific Standard Time,
tune4u@earthlink.net writes:


    and if so, should I
    go for 1 3/4" or 1 7/8"?

    Is there a simple way to decide this, or do I need to completely
regulate 3
    or 4 keys before I know it will work?



  Alan,

  Regulating 3-4 samples is good practice on any regulation, and doesn't
take but a few minutes. It will show the level of consistency in the action,
and will make sure you have workable regulating choices.

  1 11/16 to 1 7/8 will work, and even 1 11/16 will give ample power for
most players, so the first place to look is a blow that will require a dip
of around .390-.420. Another clue can be had from the engagement of the jack
and the butt. The leather that the jack pushes on should be approximately
perpendicular to the jack, when at rest. That allows the jack to slip back
under with a minimum of lost motion.

  If, on a very slow release of the key, the jack requires more than a tiny
bit of lost motion to get back under the butt, either the blow is longer
than optimal for those parts, or the hammers are too long. Either will force
the butt back too far, creating a "cavity" under the butt that won't let the
jack by without too much lost motion. The action will still work, but this
is a clue that it is not set up as designed. Too many words, but I'm trying
to make sure the description is clear.

  If the leather is the other way from perpendicular, and the dip is
shallow, you are wasting power.

  Bob Davis

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