<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" 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 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PostalCode"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"/>  <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Ric:<o:p></o:p> <o:p> </o:p> You need to read more carefully.  Dean said " If you increase the resistance of the pinning, you must also increase the spring tension to overcome this resistance for a given hammer lift."  Of course the spring tension doesn’t get increased until you increase it.  The point is you can increase the tension helping to return the key and hammer without making a jumpy hammer.<o:p></o:p> <o:p> </o:p> dp<o:p></o:p> <o:p> </o:p> David M. Porritt<o:p></o:p> dporritt@smu.edu<o:p></o:p> -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Richard Brekne Sent: Friday, June 22, 2007 10:29 AM To: pianotech@ptg.org Subject: Keep on filing...(picture attached) <o:p> </o:p> Oh come on Dean... for criminees sakes... spring tension isnt increased <o:p></o:p> until you actually increase it. Nobody said anything in previous posts <o:p></o:p> about maintaining <<a given hammer lift>>.  But since you first mention <o:p></o:p> it... have you ever actually tried seeing what happens to hammer lift <o:p></o:p> for a say.... 5 gram change in rep pinning resistance ?  I havent.. and <o:p></o:p> cant really say I know what the result would be.  But I would imagine <o:p></o:p> (as in guess at) that you probably would not see all that much a change. <o:p></o:p> Another little tidbit to check out tho... good fun.<o:p></o:p> <o:p> </o:p> Cheers<o:p></o:p> RicB<o:p></o:p> <o:p> </o:p> <o:p> </o:p>     Ric wrote: After all.. the spring tension is not actually increased.  <o:p></o:p> <o:p> </o:p>     Seems to me it is. If you increase the resistance of the pinning,<o:p></o:p>     you must<o:p></o:p>     also increase the spring tension to overcome this resistance for a given<o:p></o:p>     hammer lift.<o:p></o:p> <o:p> </o:p>     Dean<o:p></o:p> <o:p> </o:p>     Dean May             cell 812.239.3359<o:p></o:p> <o:p> </o:p>     PianoRebuilders.com   812.235.5272<o:p></o:p> <o:p> </o:p>     <st1:place w:st="on"><st1:City w:st="on">Terre Haute</st1:City> <st1:State w:st="on">IN</st1:State>  <st1:PostalCode w:st="on">47802</st1:PostalCode></st1:place><o:p></o:p> <o:p> </o:p> </div> </body> </html>