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<P>Hey Terry,</P>
<P>David Love has a little block of wood with a capstan screwed into he uses to find the right spot without hit and miss...in and out...I'm sure he'll chime in...</P>
<P>David Ilvedson, RPT<BR>Pacifica, CA 94044<BR><BR><BR></P>
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Original message<BR>From: Farrell <MFARREL2@TAMPABAY.RR.COM><BR>To: "Pianotech List" <PIANOTECH@PTG.ORG><BR>Received: 7/18/2006 5:03:27 PM<BR>Subject: Re: 1890s WNG Action Geometry<BR><BR>
<DIV align=left><FONT face=Arial size=2>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.</FONT></DIV>
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<DIV><FONT face=Arial size=2>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.</FONT></DIV>
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<DIV><FONT face=Arial size=2>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.</FONT></DIV>
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<DIV><FONT face=Arial size=2>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.</FONT></DIV>
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<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Terry Farrell</FONT></DIV>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">David Love</SPAN></FONT></P></DIV></BLOCKQUOTE></DIV></BODY></HTML>