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<DIV><FONT size=2>Dave - Check the rail with =
the let-off
buttons. If the screws are loose, the rail may have =
moved
forward or back and the jack is not being tripped =
appropriately. I
ran across that once. (in 40 years)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Don Price</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=Piannaman@aol.com
href="mailto:Piannaman@aol.com">Piannaman@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, December 05, 2003 =
8:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Story and Clark/QRS =
console
bubbling hammers</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT size=2>Hello =
again,
<BR><BR>It's been a week for pain-in-the-posterior piano problems. =
A
couple of months ago, I was called to come and see if I could figure =
out and
fix a problem with bubbling hammers on a Story and Clark console piano =
with
QRS pianomation installed. When I got there, almost every hammer =
was
bubbling. Key height was fine, but the dip was way to shallow. =
I
replaced the fat front rail felt punchings with more meager ones, did =
a bit of
regulation, and the problem was gone...at least for the time being. =
<BR><BR>I
got a call from the lady a couple of weeks ago complaining of a few =
more
bubbling hammers. I got a chance to go out yesterday, and with a =
small
amount of let-off adjustment on a few notes the problem seemed to be
cured--until I pushed the sustain pedal down. I could not make =
all of
the hammers check when the sustain pedal was engaged. <BR><BR>Can =
anyone tell
me if there is some connection between pedal/damper function and the =
QRS
mechanism? It doesn't seem as though there should be, but I have =
never
installed or worked on one of these. <BR><BR>The problem seems to be =
that when
the sustain pedal is down and the dampers up, there is not enough =
strength in
the springs to push the hammers back quickly enough to catch on the
backchecks. <BR><BR>My thought is to check the tightness of the =
whippen
and hammer centers. The action feels far more sluggish than it =
did the
first time I worked on it. I suspect moisture or something else =
has
invaded the bushings. Maybe graphite coated center pins??? =
I
certainly hope not. Been there before. <BR><BR>Any thoughts or
recommendations for possible courses of action would be appreciated.
<BR><BR>Thanks again! <BR><BR>Dave Stahl</FONT>
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