grand action problem

[Terry]

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Key Ratio.

Terry Farrell
  ----- Original Message -----=20
  From: Quentin Codevelle=20
  To: pianotech=20
  Sent: Wednesday, December 15, 2004 3:21 PM
  Subject: grand action problem


  Hi Jon,

  could you explain to those whose native language is not english what =
KR is?

  Thanks,

  Quentin



  Jon page wrote:

  Start with routine measurements:

  String height for each section
  Hammer center height on #'s 1 & 88

  (String height) - (hammer center height) =3D Bore Distance

  This will let you know if the hammers are too short.  Look at the =
string=20
  impressions in the crown, are they fairly centered?
  Are the knuckles flattened out?  Bolstering them will get your L/O =
closer.

  Action spread should be probably somewhere between 112.5 mm & 113.5 =
mm.=20
  Blow distance 46mm. Key Dip 10mm.

    As Ric mentioned, bed the key frame. Recheck action parameters.

  Is there superfluous after touch now, because if it is minimal then=20
  bringing the L/O up will decrease that.
  In other words, if the jack is far away from the knuckle when the key =
is=20
  fully depressed then there is
  tolerance for the L/O to raise. If the jack is in very close proximity =
to=20
  the knuckle then you have to deal with
  action measurements or KR.

  Have you taken touchweight measurements?  If they are low (light =
touch) I=20
  would suspect KR.

  Best of Luck,

  Regards,

  Jon Page, piano technician
  Harwich Port, Cape Cod, Mass.
  mailto:jonpage@comcast.net
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=20

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