Lens (convex) knife sharpening tool
thingiverse
This is a simple attachment to a knife sharpening tool allowing to make a convex edge. The standard model allows for 10.7 degree angle variation and R32 with my machine, the holes are for 8mm rods and fit tight without glue. I am not a professional and can't calculate the exact geometry parametrically, so feel free to adjust any value to your needs in the Fusion 360 file attached.
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