Even heat treating old brass flanges does nothing to them. It's a myth, Greg. The problem with the old flanges is a fracture mechanics problem due to the repeated striking of the hammer on the string and the carry of energy to the (brass flange) center, not a degradation of the brass itself. Paul In a message dated 8/5/2010 8:48:29 P.M. Central Daylight Time, gnewell at ameritech.net writes: Perhaps I stated it wrong or, perhaps I don’t know what I’m talking about? Do you not have to heat treat old agraffes the way you do an old brass flange rail or are they different grades of brass to begin with? Greg Newell Greg's Piano Forté www.gregspianoforte.com 216-226-3791 (office) 216-470-8634 (mobile) From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of PAULREVENKOJONES at aol.com Sent: Thursday, August 05, 2010 7:47 PM To: caut at ptg.org Subject: Re: [CAUT] When to restring... In a message dated 8/5/2010 6:26:06 P.M. Central Daylight Time, gnewell at ameritech.net writes: Are you re-annealing the brass when you do this too? Greg: The brass used in agraffes isn't annealed in any classic sense. Annealing is a controlled temperature step-down process based on the molecular mechanical characteristics of materials (such as glass or porcelain), and designed to each material's needs. The alpha brass of agraffes (>34% zinc) is a very stable alloy; heating and cooling it does nothing. Well, it gets it hot, then chillier over time. The lesser brasses, beta and marine brasses may respond differently in terms of fracture mechanics. Paul -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100805/ad171b02/attachment-0001.htm>
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