This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Lots of good methods for calculating the radius of an arc have been = provided. But there is also the question of whether the curve is a true = arc or some other shape (this assumes you have a specific shape as a = target). Most of the provided methods do not address that concern - in = fact you could have an obtuse angle with two straight sides rather than = an arc. That's why I suggested making a number of measurements along the = curve - offsets from a straight line. Terry Farrell ----- Original Message -----=20 From: Absolute Piano=20 To: pianotech@ptg.org=20 Sent: Wednesday, December 10, 2003 4:40 PM Subject: Rib dimensions Hello, I'm trying to apply some science to my soundboard rib making and I am looking for "tables of static values for the Resisting Moment (W) and = the Moment of Inertia (I) for all the possible cross sections of sugarpine = and spruce (DIN 1052 Class I will suffice). What is the formula for converting pounds/inch squared to kg/cm = squared? Given a right angle connected to the outside of an arc of a circle, = how do you prove the circle is 60'? (I made a jig for crowning ribs that is adjustable and I want to calibrate it. Thanks, Jude Reveley, RPT ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/a0/81/4a/48/attachment.htm ---------------------- multipart/alternative attachment--
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