mystery click puzzler

[Joe And Penny Goss]

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Hi Tom,
Could it be someone has placed a paper punching on top of the felt> That =
can cause a tic sound DAHIK <g>
Joe Goss RPT
Mother Goose Tools
imatunr@srvinet.com
www.mothergoosetools.com
  ----- Original Message -----=20
  From: Joe And Penny Goss=20
  To: An open list for piano technicians=20
  Sent: Wednesday, January 11, 2006 9:31 PM
  Subject: Re: mystery click puzzler


  Hi Tom,
  I suspect that there is something attached to the felt on the edge of =
the fallboard. or loose felt with hard glue making a noise against the =
wood.
  Joe Goss RPT
  Mother Goose Tools
  imatunr@srvinet.com
  www.mothergoosetools.com
    ----- Original Message -----=20
    From: Tvak@aol.com=20
    To: pianotech@ptg.org=20
    Sent: Wednesday, January 11, 2006 7:51 PM
    Subject: mystery click puzzler


    List

    Here's a puzzler for you all; an unsolved puzzler at that.  I've =
executed a repair, but I have no idea why it works...

    Kawai grand, about 15 years old.  There's a click on F#2, G#2, and =
A#2 when the key is depressed.  Not when it's released but at the moment =
they're depressed quickly.  (It won't happen on a slow strike.)

    I take the action out to check for loose screws, debris on the keys, =
any anomaly, but nothing.  In fact, the click is gone.  I did tighten =
one screw on one of the action rails, so, maybe that was it...

    Put the action back in, still no click.  Reinstall the cheek blocks, =
still no click. =20

    When I put the fallboard back on, there's the click again.  Pull the =
fallboard forward to a 45 degree angle, no click.  Back to vertical, =
click,

    OK.  The keys must be hitting the fallboard, but wait a minute.  It =
happens when the key goes down, not up.  The fallboard does not extend =
backwards inside all the way to the back side of the balance rail, so =
when the key goes down, there is MORE clearance from the fallboard.  If =
the click was on the way up, I'd say it was hitting the fallboard when =
it returned to the up position, but it happens on the way DOWN!

    Am I just stupid?  Am I missing something here?

    My solution?  I raised the fallboard so that there was more =
clearance from the keys and now there's no click.=20

    But how can the keys strike the fallboard on their way down and make =
a noise?  It doesn't make sense.

    It's not the upstop rail being depressed by the fallboard (That =
click would happen on the way up, too.).  I put felt on the backside of =
the fallboard at the point where the keys would come into contact with =
it if that was the problem to see if that changed the sound or =
eliminated it,, but it didn't have any impact.

    I guess I should move on, because I fixed the problem.  But  I just =
want to know: what caused the click?

    Any ideas? Did I describe this well enough? =20

    Tom Sivak
    Chicago 
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