Hand cranked coffee grinder electric conversion

cults3d

V2 is up, it uses a bigger motor, those files are tagged with "_v2". I'm working on a cover so electronics will be hidden and motor might get a little bit less noisy. First of all, this is just a quick and dirty solution (the problem is simple, I'm too lazy to crank it by hand every morning), I will definitely upgrade it (making a motor housing to be quieter, hiding electronics), but using it with a drill was still an issue, as you needed to hold it. Use a good quality power supply, depending on your motor it might need higher amperage that cheap bad quality ones might not be able to supply. WARNING! Depending on your grind coarsness and the resistance of your grinder, different motor strength might be recommended. With further testing I noticed the old smaller motor struggled (and sometimes completely stopped) when grinding espresso fine, so I designed new version with a bigger motor, this one works fine. USE WITH CAUTION, AT YOUR OWN RISK! It works with grinders that have an outer diameter of ~48 mm (+/- few mm is tolerable do to flexibility of mount), and pentagonal shaft, but feel free to modify it according to your needs. Also you need a motor (or modify the connecting shaft accordingly) like that. New (bigger) motor. I used the 98 RPM one, might work with faster, but use at your own risk: https://www.aliexpress.com/item/1005003646485473.html?spm=a2g0o.order_list.0.0.50871802Rw2FXv Old motor, might not be strong enough when grinding espresso fine: I used a 12V 100 RPM one (will test 200RPM soon), this one works, you can test it, but with caution, because high rpm might burn your grounds and it can even damage your grinder. https://www.aliexpress.com/item/32987942205.html?spm=a2g0o.order_list.0.0.21ef1802hczlaF The motor controller I used: https://www.aliexpress.com/item/33013906540.html?spm=a2g0o.order_list.0.0.21ef1802hczlaF You can use any other motor controller (just make sure you have the proper voltage, else you might burn down the motor). I printed the shaft with the bigger part flat on plate, no supports needed, didn't have issues with strength yet, but layers might separate at high force. Motor mount is printed with flat side on plate, supports only needed for the small overhang (on buildplate, over 70 degrees). You need 2 pieces of M3*10 screws for motor mounting and 2*M3 screws and nuts for grinder connection. Should be okay from any material, check motor, as it might get hot after more usage.