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I ended up using a the following solution, but it doesn't work so nice with small fillets: I traced the corner on a piece of paper. Then, I picked 2 point on the arc and drew tangents on those points (red). Then I drew 2 line that where perpendicular to those tangents until those line intersected (blue). From the intersection of the perpendicular lines ...


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Jack's idea is probably the best practical solution. The problem is that measurement precision becomes increasingly more critical as the radius being measured decreases. Obviously, when dealing with a fillet, we're talking about very small dimensions. A measurement error of 1/16" results in a substantial calculation error. Calculators such as this one do ...


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I use low tech things for that kind of stuff. Bottle caps, jar lids, rolls of tape, 5 gallon buckets, whatever may fit the curve I am trying to measure. Once I find one that fits the curve, I measure the diameter and divide for the radius. There is a formula for finding diameter if you can set a straightedge or at least create a straight line between 2 ...



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