About this 3D model

Radius Gauge If you like what I do, please buy me a coffee from the link below. :-) http://paypal.me/avicode Please see picture for formula, which are derived from the original. Unlike other designs, the zero setting for this one should be the same as the zero setting for the actual caliper, since the caliper fits into the tool fully, and there is no extra length to be considered! Easier math! Also, for simpler math, the distance between the 2 prongs is intentionally set at exactly 75mm and no decimals! Formula 1 (For radius that fits within the 2 prongs): R = d x 2.414 (also engraved on the part) Formula 2 (For radius that fits outside the 2 prongs): R = (75 x 75 + 4 x (75/2-d) * (75/2-d)) / 8 / (75/2-d)