Math help please, computing an arc and radius.

Michael Baglio · 2004-09-26T13:48:59+00:00

I'm trying to put a _very_ subtle curve on the bottom of some tableaprons. I've placed some nails in the apron templates at theappropriate points and used a piece of 1/8th" thick wood to try todraw a fair curve but, (whether I drink to much coffee or I'm just notgood at drawing), I'm not liking the resulting lines, so I'm hopingI'll get more perfect results by using a (_very_) long trammel arm onmy router to do this. The height of each arc will be 1/4" above the baseline of each apron.The center point of the long aprons is 25-3/8ths from each end, andfor the short aprons the center is 9". Like I said, these are goingto be very subtle curves, but visually important and I want themperfect. ;>How would I compute the radii of the circles I would need to give methe arcs for each apron?(Alternatively, is there another method that doesn't rely on howsteady my drawing hand is in order to do this?) :)Michael "Shakey" Baglio

Sep 26, 2004 21 Replies

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Juergen Hannappel 21 years ago

[...]

Very easily, the ends of the arc are very different: the elipsis will come down perpendicular to the original board edge, while the circle will be almost parallel.

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Hylourgos 21 years ago

You're assuming much smaller (circle) arcs than the participants of this thread have. See above in the thread for the humor.

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