<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style></style></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1>Assuming a rather poorly set up key to wippen relationship and assuming a very short key (i.e., one typical of a 150 cm grand) the sliding motion will be about 0.2 mm (or about 0.008”). Most actions—properly set up and with longer keys—will have less than this. <o:p></o:p><o:p> </o:p>There is so little sliding motion between the capstans and the wippen that the capstans typically corrode and discolor. If there was any appreciable sliding motion they would polish themselves. <o:p></o:p><o:p> </o:p>ddf<o:p></o:p><o:p> </o:p>Delwin D Fandrich<o:p></o:p>Piano Design & Fabrication<o:p></o:p>6939 Foothill Court SW, Olympia, Washington 98512 USA<o:p></o:p>Phone  360.515.0119 — Cell  360.388.6525<o:p></o:p><a href="mailto:del@fandrichpiano.com">del@fandrichpiano.com </a>— <a href="mailto:ddfandrich@gmail.com">ddfandrich@gmail.com</a><o:p></o:p><o:p> </o:p>From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Dale Erwin Sent: Saturday, September 22, 2012 7:05 PM To: joegarrett@earthlink.net; pianotech@ptg.org Subject: Re: [pianotech] re; Action Ratio Measuring<o:p></o:p><o:p> </o:p>Hi Joe<o:p></o:p><div>Wether the  casptan is straight or angled, watching it move thru its motion changes its contact point with the wippen heel. Not by sliding but by rotating. Its not much and I'll choose not to split hairs about it. Ok?<o:p></o:p><div>Dale Erwin R.P.T. Erwin's Piano Restoration Inc. Mason & Hamlin/Steinway/U.S. pianos <a href="http://www.Erwinspiano.com">www.Erwinspiano.com</a> Phone: 209-577-8397 <tt> </tt> <tt>  </tt><o:p></o:p></div><o:p> </o:p><div>-----Original Message----- From: Joseph Garrett <<a href="mailto:joegarrett@earthlink.net">joegarrett@earthlink.net</a>> To: pianotech <<a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a>> Sent: Sat, Sep 22, 2012 6:51 pm Subject: [pianotech] re; Action Ratio Measuring<o:p></o:p><div id="AOLMsgPart_0_81fa6c07-27c4-4866-89a4-91d4f5f609da"><pre style='margin-left:36.0pt;background:white'><tt>Dale said: "All actions are subject the accelerating action phenomena to<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>changing ratios thru the complete range of motion as the capstans is moving<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>further from the wip center pin and the increasing leverage efficiency in<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>the wip."<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>Dale,<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>I can't agree. The capstan does not move but a miniscule "...further from<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>the wip center pin...". Del brought this to my attention during a Key class<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>I was giving. I agree with Del, ...that there is little movement of the<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>capstan along the wippen foot felt! They are so close to linear to each<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>other that the differences of their arcs is pretty much negligible imo.<G><o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>Joe <o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>Joe Garrett, R.P.T.<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>Captain of the Tool Police<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt>Squares R I<o:p></o:p></tt></pre><pre style='margin-left:36.0pt;background:white'><tt><o:p> </o:p></tt></pre></div></div></div></div></body></html>