<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:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40" XMLNS:U1> <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"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"/>  <style>  </style>  </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> VERB:Inflected forms: lu·bri·cat·ed, lu·bri·cat·ing, lu·bri·cates TRANSITIVE VERB:1. To apply a lubricant to. 2. To make slippery or smooth.<o:p></o:p> <o:p> </o:p> It is of course the second definition to which I was referring. On a molecular level the interaction of some metals against each other produces an above normal amount of friction, while others, e.g., steel on brass, produce a friction level below what one would normally expect. Their interaction is more slippery or smooth than that of other metals, i.e., self-lubricating. No oil required. <o:p></o:p> <o:p> </o:p> <div> Dean<o:p></o:p> <u1:PersonName u2:st="on"><st1:PersonName w:st="on">Dean May</st1:PersonName></u1:PersonName>             cell 812.239.3359 <o:p></o:p> PianoRebuilders.com   812.235.5272 <o:p></o:p> <u1:place u2:st="on"><u1:City u2:st="on"><st1:place w:st="on"><st1:City w:st="on">Terre Haute</st1:City></u1:City> <u1:State u2:st="on"><st1:State w:st="on">IN</u1:State></st1:State>  <u1:PostalCode u2:st="on"><st1:PostalCode w:st="on">47802</u1:PostalCode></st1:PostalCode></st1:place></u1:place><o:p></o:p> </div> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of PAULREVENKOJONES Sent: Tuesday, August 07, 2007 11:39 PM To: <st1:PersonName w:st="on">Pianotech List</st1:PersonName> Subject: Re: Counter-bearing drag<o:p></o:p> </div> <o:p> </o:p> <div> Hey, Dean, another myth rears it head...<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> Brass, steel, and cast iron have quite different coefficients of friction because of the way that the surface "galls" or wears down under compression and the movement of one surface against another. What you're referring to as "lubricating" is just a way of describing the friction differentials between the materials. There's no oil, or lubricity, involved. <o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> Paul<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> <div> "If you want to know the truth, stop having opinions" (Chinese fortune cookie)<o:p></o:p> </div> </div> <div>  <o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> In a message dated 08/07/07 22:02:01 Central Daylight Time, deanmay@pianorebuilders.com writes:<o:p></o:p> </div> <blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt; margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'> <div> My understanding is from a chemical standpoint steel on brass is self lubricating.<o:p></o:p> <o:p> </o:p> <div> Dean<o:p></o:p> <U1:PERSONNAME u2:st="on"><st1:PersonName w:st="on">Dean May</st1:PersonName></U1:PERSONNAME>             cell 812.239.3359 <o:p></o:p> PianoRebuilders.com   812.235.5272 <o:p></o:p> <U1:PLACE u2:st="on"><U1:CITY u2:st="on"><st1:place w:st="on"><st1:City w:st="on">Terre Haute</st1:City></U1:CITY> <U1:STATE u2:st="on"><st1:State w:st="on">IN</U1:STATE></st1:State>  <U1:POSTALCODE u2:st="on"><st1:PostalCode w:st="on">47802</U1:POSTALCODE></st1:PostalCode></st1:place></U1:PLACE><o:p></o:p> </div> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabIndex=-1> </div> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Jude Reveley/Absolute Piano Sent: Tuesday, August 07, 2007 10:10 PM To: pianotech@ptg.org Subject: Counter-bearing drag<o:p></o:p> </div> <o:p> </o:p> <div> Ahh, kinda late in the thread, but I've been thinking...oh no!<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> I'm looking to upgrade my string terminations on my rebuilds too like so many of you cool guys and gals so my questions are:<o:p></o:p> </div> <div>  <o:p></o:p> </div> <ol start=1 type=1> <li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt: auto;mso-list:l1 level1 lfo3'>How do bend your half rounds to conform to any required sweep? Clamp in a form? <o:p></o:p></li> <li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt: auto;mso-list:l1 level1 lfo3'>Why brass? It is so soft, will get marred by the strings and eventually tarnish?  Why not anondized aluminum or titanium? If it's a question of economics, shouldn't we at least plate the brass? <o:p></o:p></li> </ol> <div> Thanks for any thoughts...<o:p></o:p> </div> <div>  <o:p></o:p> </div> <div> Jude Reveley, RPT Absolute Piano Restoration, LLC <st1:place w:st="on"><st1:City w:st="on">Lowell</st1:City>, <st1:State w:st="on">Massachusetts</st1:State></st1:place> (978) 323-4545<o:p></o:p> </div> </div> </blockquote> <div>  <o:p></o:p> </div> </div> </body> </html>