Conic Fillet Ruler

Four 8" ruler-like tool displaying .5", 1", 1.5", and 2" conic fillets from rho=.95 concave to rho=.95 convex.

Rho=0 (flat/chamfer) at the center and rho=.5 (parabolic) at the two .5 markers. The .4 markers have an "R" above them to indicate the location of constant radius (standard fillet) which fall at rho=~.42

Ruler is marked by the dividing wall at rho = 0 (center), and with tick marks at rho = .1, .2, .25, .3, .4, .5, .6, .7, .75, .8, .9 for both concave and convex fillets.

This is a super useful tool for learning surface modeling concepts. By looking at how light reflects off the ruler, you can see how a standard fillet provides poor surface continuity compared to a rho=.75 conic, and why that might be used instead. Scaling the model can show how larger conic fillets with a higher rho value can replace a smaller fillet for a better surface finish (i.e. using a 1" rho=.75 conic in place of a .5" standard fillet).
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Rev C:
-Deeper/larger engravings for tick marks