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Life hack: link your manual grinder to a drill. Now you have a automatic grinder that’s reasonably priced and have a superb burr.

Have not tried this myself but I was told by a professional this is way cheaper and better than any automatic grinder below USD$1000, if you’re spending around $200 for a top end hand grinder

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The main issue with doing this is the potential to damage your grinder. Your arm has a built in torque limiter, has a feedback loop and only operates at a low speed. If you want to do this with a drill I would recommend one with a torque limiter and a variable speed so you can use it at a low speed.

There are also other niceties that proper electric grinders give you.

I hear an electric screwdriver works too. :)

Grinding coffee beans manually helps me get that little bit of arm exercise though.

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