Hey, Dean, another myth rears it head... 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. Paul "If you want to know the truth, stop having opinions" (Chinese fortune cookie) In a message dated 08/07/07 22:02:01 Central Daylight Time, deanmay at pianorebuilders.com writes: My understanding is from a chemical standpoint steel on brass is self lubricating. Dean Dean May cell 812.239.3359 PianoRebuilders.com 812.235.5272 Terre Haute IN 47802 From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Jude Reveley/Absolute Piano Sent: Tuesday, August 07, 2007 10:10 PM To: pianotech at ptg.org Subject: Counter-bearing drag Ahh, kinda late in the thread, but I've been thinking...oh no! 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: How do bend your half rounds to conform to any required sweep? Clamp in a form? 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? Thanks for any thoughts... Jude Reveley, RPT Absolute Piano Restoration, LLC Lowell, Massachusetts (978) 323-4545 -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20070807/7ce9d1a7/attachment-0001.html
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