This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment ----- Original Message -----=20 From: Erwinspiano@AOL.COM=20 To: pianotech@ptg.org=20 Sent: July 11, 2002 6:35 AM Subject: Re: rib radius In a message dated 7/11/2002 4:31:37 AM Pacific Daylight Time, = mfarrel2@tampabay.rr.com writes: Dittos Terry.=20 I Know of no on using less crown in the treble. At least many are = using 60ft. thru out and many of us increasing radius into the treble. = I think the confusion is that a 60 ft. curve on a 40 inch rib appears to = have proportionally more crown (7-8 mm) than a 15 inch rib with a 25 ft. = curve ( 1.5mm) when observed visually.=20 >>>>>Dale Erwin>>>>>>>> Dale & Terry, Let's define our terms here. When talking about increasing or decreasing = crown we're generally referring to the amount of visible curvature in = the system -- a particular rib or the whole board. So an increase in = crown means the system has more visible curve and a decrease in crown = has less. It's the radius of the curve that is changing. Now, if we're = talking about radius then a rib cut to a 40' radius has more crown than = does a rib cut to a numerically larger 60' radius. Regardless of length. We use ribs of smaller radius (larger crown) in the treble and ribs of = larger radius (smaller crown) in the bass. At least I think that's what Terry was referring to? Del ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/2d/33/07/4e/attachment.htm ---------------------- multipart/alternative attachment--
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