---------------------- multipart/mixed attachment >>Realistically, the exact shape of the described arc isn't anything like >>critical to the ultimate performance of the assembly. The chosen radii and >>rib dimensions, balanced against the anticipated bearing load and resulting >>deflection are significantly more important. > > > My question is: why express these rises of arc in such an arcane > fashion as radius of a HUGE circle? Is it because of the need to be > uniform despite the length of arc required ? >Glenn C. Convention and convenience. A radius length gives people a simple magic number that describes a shape with minimal information and provides a common language for communication. As I said above, I doubt that it much matters what exact shape the ribs are crowned to. It won't be that shape in use in the piano in any case. Ron N ---------------------- multipart/mixed attachment --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.530 / Virus Database: 325 - Release Date: 10/22/2003 ---------------------- multipart/mixed attachment--
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