---------------------- multipart/alternative attachment In a message dated 11/13/03 1:32:52 AM, Erwinspiano@aol.com writes: > What do I mean? This will answer Crashvalves question as well. When=20 > pre-stressing a board with good legitimate crown values as I described, it= does=20 > require having the plate in and secured with bolts & screws. Enough so tha= t when=20 > driving the maple wedges between the struts and the bridge tops it (the=20 > plate)=A0doesn't flex. >=20 Well drat, I was hoping you were talking about iterating some trigonometry=20 that would use the string scale and degrees of downbearing and yield a down=20 bearing in pounds. This then loaded onto the bridge to test board deflection= . At=20 this stage of soundboard build, the only variable left to tweak is plate=20 set/downbearing, and knowing the amount of deflection expected from a board=20= might be=20 a good indicator of stiffness ? Sorry if this seems overly minute, but I see= m=20 to get farther along in just about any piano task if I can mike it up. BTW=20 how did you measure that .400 panel ? I have seen an un-mounted soundboard=20 calipered using a dial indicator clamped to the top of a jigsaw (sans blade)= but in=20 the piano is different. I finished putting a .020 probe into the end of a=20 depth mike ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/99/85/4a/b7/attachment.htm ---------------------- multipart/alternative attachment--
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