The grinding could probably be automated somehow; might actually be easier to get 'random' movements that way too.. I imagine a X/Y/R table with the blank (or

The grinding could probably be automated somehow; might actually be easier to get 'random' movements that way too.. I imagine a X/Y/R table with the blank (or tool, alternatively) and the tool mounted on top on a semi flexible arm that applies pressure mostly on the center, so it gets to 'rock' a little... Put a spoon of grit on the blank, place the tool on top, press the timer and go have a beer :-) But yeah, that's also a project that'll stick to the back of the queue for quite a while ;-)