Every once in a while I need to cut a curve in a sheet of timber. Typically I will do this with my router attached to a simple beam compass (see photo, left), but it can also be done by attaching the sheet to an armature for cutting over a fixed (table) router. In either case I typically know the width and depth of the curve I'm after, but not the length of the armature (i.e. the distance from the pivot to the cutting head).
I wrote the following to do that calculation...
Another of my calculators you might find useful: Circle/Cone Calculator
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