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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.
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.
Could you please tell me what the cup you collect the grounds into is called?
I recently made this grey bracket to fit the front profile of a DCD708: 
My rough idea is to add a pair of "tusks" that fit into the 1Zpresso JX to hold the torque.
Yeah, that would solve the biggest problem, which is how annoying it is to hold when you try to use just the drill and grinder.