LIPO Burr Grinder

[macrosloth]

Take a decent hand burr coffee grinder.. Retrofit small brushless motor/ESC/ESC-tester to control and a LIPO battery - Have the most high tech portable coffee grinder in the world..

Thoughts?

Would any small RC motors have enough torque for direct drive?

 

[Hillhater]

A hand grinder is designed to turn slow ( <100 rpm ?) so you will probably need a reduction gbox .
I have never tried it but i always thought one of those small cordless screwdrivers would be ideal to drive a hand grinder like that ?...maybe even for powering one of the big quality grinders..Lido, Pharos, etc for kitchen use .

 

[whereswally606]

I once cut a cross head screw into the top of my manual coffee grinder and used an electric screwdriver to turn it. I would say on reflection it was too much speed and plenty of torque and they just aren't designed for it. now I've given up on coffee/caffeine entirely as I find I am more awake all of the time than if I drink my old 8 cups or so a day (which itself can cause health problems). Drink green tea instead, apparently good for cholesterol levels.

but if you are going to drink coffee at least have a proper one, good luck with your experimenting.

 

[KalSteve]

It would be pretty easy to team any hand powered conical burr grinder with a 100rpm 12v gear reduction motor connected directly to a 4S lipo pack. No ESC needed and the power draw should be so low you can use a standard 12v 10amp switch.

Plenty of 12v 100rpm gear reduction motors show up with a simple search on ebay. I would start with something rated at least 10kg-cm torque. Otherwise the cordless screwdriver should work.

 

[Hillhater]

Why ? You dont need 12 volts .
Those $20 , 4v ,cordless screwdrivers (some with variable speed) have enough torque and would be useful for other tasks when not grinding coffee ! :wink:

 

[macrosloth]

Its not a question of is it simple to do IE cordless drill, or cheap - IE 12v DC gear reduction.. More so just a chance to learn how the different parts work together, and learn something about ESC's and BLDC in the process.

Thanks for the feedback.