Bass hammer checking

[Kevin E. Ramsey]

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    The bedding of the action isn't the same in and out of the piano. =
What I would do is check the keydip with a dip block in the piano with =
the action bedded, then, you can pull the action out in your lap and =
find the correct balance point that will give you the same key dip, and =
regulate from there.
    If you're working on a bench, set up sample notes with the keyframe =
bedded in the piano, put it on the bench, bed it to the bench, and =
regulate; knowing you'll have to re-bed it when you put it back in.



  ----- Original Message -----=20
  From: Phillip L Ford=20
  To: pianotech@ptg.org=20
  Sent: Thursday, March 14, 2002 6:45 PM
  Subject: Bass hammer checking


  Yesterday I worked on an older Baldwin with a Schwander action that
  had a characteristic that I've encountered on other grand pianos,
  some having it more than others.  The hammers check perfectly on the
  bench or when the action is pulled out in your lap, but won't check =
when
  the action is in the piano.  This behavior is usually only noticeable =
in the
  low end of the scale and becomes most pronounced at the bottom.  On =
some
  pianos it seems that you can't get the hammers at the bottom end to =
truly
  check no matter what you do; make the checking shallower, make it =
deeper,
  groove the tail, rough up the check leather, change the back check =
angle,
  reduce rep spring strength to almost nothing, etc.  When I say 'truly =
check'
  I mean behave as in the rest of the piano.  The hammer is held
  some distance below the string when the key is down and rises
  when the key is released.  Apparently some sort of 'checking'
  is going on because even on a hard blow the hammers don't bounce back =
to
  the strings.  But the tail isn't really being held by the backcheck =
when the
  key is down.  What's the reason for this?

  Phil F
  ---
  Phillip Ford
  Piano Service & Restoration
  1777 Yosemite Ave - 215
  San Francisco, CA  94124



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