https://www.thingiverse.com/thing:6075723 https://youtu.be/KmCcjxr04Fs
My arm was getting tired, so I decided to over-engineer my coffee grinder. It already runs on a standard screwdriver bit hex, so I was actually pretty surprised that nobody else beat me to it.
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I've been tempted to do the same thing for years with my Hario Skerton and a Makita 12v driver drill. It's 400ish cranks every morning. I would imagine a finer grind with an espresso bean would take you much longer. As it is, the morning grind is part of my routine and a much as automating the process, having my drill shared between the garage and the kitchen would introduce it's own issues.
I've found that espresso grinding on my 1Zpresso J-Max is way faster than anything on my Hario. Takes roughly 30sec for a 20g dose in the max and I remember the Hario taking as long as a kettle for an aeropress.
It's not too bad, I stick with darker roasts and with the smaller dose it's usually under a minute to grind. I'm in a studio, so my drill is actually more accessable now, if a bit harder to hold.