---------------------- multipart/alternative attachment Try the following for your jig... at least as I understand you.. [Image] Also... if the length of your square is 1 meter and you place it so that it tangents the circle at its midpoint, then the end should be roughly 2.08 mm off the circle. (Assuming a 60 meter radius.) So if you have a 1 meter rib crowned to a 60 meter radius then the midpoint of the rib should be 2.08 mm higher (or lower as the case may be) then the end points. 60 - 60 Sin InvCos (1/120) = 60 - 60 Sin 89.52252964 degrees = 60 - 59.99791663 meters = 2.083369504E - 03 meters = 2.08 mm Cheers RicB Absolute Piano wrote: > > 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 -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html http://www.hf.uib.no/grieg/personer/cv_RB.html ---------------------- multipart/alternative attachment --------------9668D107B079B6E125AAB023 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/4e/c1/8d/a7/attachment.htm --------------9668D107B079B6E125AAB023 A non-text attachment was scrubbed... Name: C:\\DOCUME~1\\RICHAR~1\\LOCALS~1\\Temp\\nsmail7I.jpeg Type: image/jpeg Size: 13979 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/ae/8b/54/fc/nsmail7I.jpeg --------------9668D107B079B6E125AAB023-- ---------------------- multipart/alternative attachment--
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