Bass hammer checking

[Richard Brekne]

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Hi Phil. I used to run into this all the time

One thing I found that consistantly seems to address this "it works on
the bench but not in the piano" is dead on squaring of hammers to
strings, and solid centers to keep the hammer on line. Just a thought.
Otherwise I am not a fan of checkering tails, actually like them smooth
as a babies behind, and thin as well.

Good back check height also seems to be a key player here.

RicB

>      From: Phillip L Ford
>      To: pianotech@ptg.org
>      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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>




--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html


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