Radius Gauge
thingiverse
This print fits a Tyre tread depth gauge available cheap on eBay. Thanks to Fredrik Welander for the idea; see https://subsite.github.io/rad/ for an online calculator. https://www.thingiverse.com/thing:2811444 Usage: The formula for calculating radius from a circular arc or segment is R = H/2 + W^2 / (8 * H) where R equals radius, H equals height, and W equals width. To use the Radius Gauge, place on a flat surface and zero your caliper. Note: HEIGHT is the reading on the caliper display; Width is 60mm or to be more accurate, the distance between contact points on the curved surface - my print ended up at 58.8mm.
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