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<DIV><SPAN class=501141423-30092002><FONT size=2>David, =
</FONT></SPAN></DIV>
<DIV><SPAN class=501141423-30092002><FONT =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=501141423-30092002><FONT size=2>I believe you read =
a little too
fast, it is 60 DW 45 UW that makes 52.5 g Balance weight and a light 7.5 =
g
friction.</FONT></SPAN></DIV>
<DIV><SPAN class=501141423-30092002><FONT =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=501141423-30092002><FONT size=2>Even then, if all =
else is
correct, adding lead may not cause problems I =
believe.</FONT></SPAN></DIV>
<DIV><SPAN class=501141423-30092002><FONT =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=501141423-30092002><FONT size=2>The hammers may be =
very heavy
to obtain this figure (I understood that, finally !)</FONT></SPAN></DIV>
<DIV><SPAN class=501141423-30092002><FONT =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=501141423-30092002><FONT =
size=2>Regards.</FONT></SPAN></DIV>
<DIV><SPAN class=501141423-30092002><FONT =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=501141423-30092002><FONT =
size=2>Isaac</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px =
solid; MARGIN-RIGHT: 0px">
<DIV><FONT face=Arial size=2>It's pretty hard to address this =
without a little
more data. Adding lead may not be a problem depending =
on the actual
front weight. The bass section will often take 4 leads without =
an
inertia problem, but it depends on where they are. Your C4 has a =
balance
weight of 47.5 g. To bring it down to 40 you will need to add =
7.5 grams
to the front weight. With only two leads at this position it may =
not be
a problem, but it depends on the overall front weight. Balance =
weight at
40 is a reasonable target for this action. That puts the DW/UW =
at 47/33
with 7 grams of friction. I'd rather see the friction around 10 =
here so
I would check the hammer flange pinning. With 10 grams of =
friction, the
DW/UW will be 50/30. If the hammer weight/strike weight at this =
point is
representative of the overall curve and the front weight is not too =
high, that
will produce a nice feeling instrument. Stanwood's system
provides a nice method for analysis of these points. The
fundamentals of this system are available from the journal archives in =
a
series of 3 articles written awhile back. I highly recommend you =
become
familiar with them. It is perfectly designed to answer questions =
such as
you are posing. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>David Love</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=dm.porritt@verizon.net =
href="mailto:dm.porritt@verizon.net">David
M. Porritt</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> September 30, 2002 6:01 =
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Heavy action</DIV>
<DIV><BR></DIV>
<DIV>I have a Baldwin SF-10 here on which I just measured =
the
action weight. C4 is 60 grams down, 45 grams up! =
Friction --
obviously is good -- down weight bad. I hate adding lots of =
lead to
the keys, but on this piano there are only 3 weights in the bass =
section, 2
at C4, only 1 in the upper treble, and actually 2 in the _back_ of =
C8.
It appears that they did straight pattern leading on this one. =
I can
add 1 - 2 weights to each key and bring it down to 44 at A0, 42 at =
C4 and 40
at B7 (I'd probably just take out a back weight on C8). </DIV>
<DIV> </DIV>
<DIV>There is a point of diminishing returns on some actions where =
you can
reduce downweight by adding leads but the additional =
inertia makes
it feel to the player as though it is as heavy as it was =
before. Does
anyone think I'd get into inertia problems adding this amount of =
lead?
</DIV>
<DIV> </DIV>
<DIV>dave</DIV><PRE>_____________________________
David M. Porritt
dporritt@mail.smu.edu
Meadows School of the Arts
Southern Methodist University
Dallas, TX 75275
_____________________________</PRE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTM=
L>