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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If the capstan is too low then cut a short
dowel (the width or less of the key) of the right diameter to approximate
the desired height of the capstan. Lay some double stick tape on the key
stick where the capstan will go so that you can roll the dowel back and forth
and it will stay put. Then position the dowel where you think it should
go on a key with known front weight (say 80 - 85% of maximum for that note) and
your likely strike weight given the hammer set you are using. Move the
dowel/capstan around until you achieve the balance weight you want. Then mark
and measure the position using Stanwood KR system. With the little stand
it’s more important that you position it consistently. I line up
the front of the key with the edge of the 90 degree holder which puts the
little roller just behind the front—about where your finger is likely to
be. To mark the capstan position for drilling I use a jiffy lead trimmed to
10 grams with the screw hole centered. Lay the lead on the key surface
and move it slowly in one direction in very small increments until the scale
just turns over to the number you are targeting. You will notice that the
lead will move a fair distance without the scale changing so you want to be
sure you are at the point where the number just turns to insure accuracy
between keys. Take a thin transfer punch and insert it down through the
hole in the jiffy lead to mark your capstan drilling position. Mark the
beginning and end key of each section and then scribe a line with a razor
blade. Check to see that your lines are contiguous. Double check and
then check it again. Plugging and redrilling after plugging and redrilling
is really a drag. </span></font></p>
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10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Assuming that you are using a 17 mm
knuckle I would guess that a Stanwood KR of about .51 or .52 would be about
right especially considering the capstan is moving away from the wippen flange
which will also contribute to a lower overall ratio. At least that’s
where I would start. It is very likely that .48 KR will be too low.
On a Steinway that KR would normally match up with a 16 mm knuckle. </span></font></p>
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10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p><font size=2 color=navy face="Times New Roman"><span style='font-size:10.0pt;
color:navy'>David Love</span></font><font size=2 color=navy><span
style='font-size:10.0pt;color:navy'><br>
davidlovepianos@comcast.net<br>
www.davidlovepianos.com</span></font><font color=navy><span style='color:navy'>
</span></font></p>
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<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3 color=black face="Times New Roman"><span style='font-size:
12.0pt;color:windowtext'>Original message<br>
From: Farrell <br>
<MFARREL2@TAMPABAY.RR.COM>To: "Pianotech List" <br>
<PIANOTECH@PTG.ORG>Received: 7/18/2006 5:03:27 PM<br>
Subject: Re: 1890s WNG Action Geometry</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:windowtext'>Yes,
4.9, Stanwood. Linear measurements suggest 4.8 (man, you're right on target!).
I agree with you - I'm too far forward with the capstan. I'll be trying a
location that simple mathimatical interpolation would suggest to yield about
5.5/Stanwood.</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:windowtext'>Let's
see - on one note, the original location was R = 6.24/Stanwood and an
8 mm move yields R = 4.92/Stanwood. So if I target R = 5.5/Stanwood I
should move the capstan 4.5 mm forward from the original location.</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:windowtext'>On the
other note, the original location was R = 6.24/Stanwood and
an 11.5 mm move yields R = 4.64/Stanwood. So if I target R =
5.5/Stanwood I should move the capstan 5.3 mm forward from the original
location.</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:windowtext'>So
I guess my next try should be with about a 5 mm move forward from the original
location. And of course, the increase in wippen heel height will be smaller as
I adjust that to have the heel/capstan interface on the magic line at
half-blow.</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:windowtext'>I'll
give that a try on a few notes and fully regulate them - that'll give me
something specific to talk about then. Thanks for your (and all others!) input.</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:windowtext'>Terry
Farrell</span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:windowtext'>-----
Original Message ----- </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Is that a Stanwood 4.9
ratio? If so, I think that’s a bit low and you might
compromise the regulation some. Remember that as you move the capstan
forward on the key you also benefit from the move away from the flange in the 2<sup>nd</sup>
class wippen lever. I don’t like to get a ratio lower than 5.5
(Stanwood) which should allow you a fair amount of leeway with hammers and
front weights to achieve something between 36 and 40 BW. My usual target
is 37. If you calculate the ratio via linear measurements, the number will
be bit lower than with Stanwood measurements. </span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Otherwise, capstan
movements are pretty common on action I work on. Relocating or changing
the height of wippen heels is not uncommon either.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>David Love</span></font></p>
</blockquote>
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