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 on line calculator. https://www.thingiverse.com/thing:2811444 Usage. The formula for calculating the radius from a circular arc or segment is R = H/2+W²/(8*H) where R = radius, H = height and W = 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 the contact points on the curved surface my Print ended up to be 58.8mm
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