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Alex, Are you cutting a concave curve or a convex curve? I was able to get VERY accurate convex runners for my EQ platform by bolting a pivot arm at the required radius above my belt sander and bolting the runners on an A frame, so that they swung over the belt. This gave a perfectly circular result. The same idea could be used with a convex cut with a drum sander with a radius smaller than that of the cut, but as big as you can get. You would need a solid rubber drum rather than a foam backing and a rigid mount for both the pivot and the drum.
Cheers.
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