---------------------- multipart/alternative attachment You could also do this simply by r - Sqrt( r ^2 - (0.5L)^2) L being the length of the rib. D below is the diameter Cheers RicB Richard Brekne wrote: > > 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 > -- 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 --------------B4F13252DC22CC084BA3F271 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/3b/ec/07/67/attachment.htm --------------B4F13252DC22CC084BA3F271 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/20/87/55/85/nsmail7I.jpeg --------------B4F13252DC22CC084BA3F271-- ---------------------- multipart/alternative attachment--
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