I have been toying with designing and machining my own grinder for a bit now. Lots of great lessons to draw from this. Did you consider the fact that you have multiple beans getting ground at once, and in the larger cone there are a multitude more that the smaller cone you based your torque calculations on?
It's a super fun and rewarding project! I think my biggest mistake in a design sense was making poor assumptions about the torque relationship between smaller and larger burrs. It's clearly not a linear relationship based on burr radius. I think it depends much more on the specific geometry between the inner and outer burrs as each bean is crushed, something that's very hard to model or calculate. If I were to do it over, I'd make a simple 3d printed setup with the big burrs a hand crank to measure the torque, then spec a motor based on that info. Windshield wiper motors should have enough torque when paired with a gear/pulley system but they also don't provide torque info so you'd need to measure the motor torque. Hope this helps.
@@MeilingZhao Interesting idea! It's possible that a conical burr grinder may work better than a flat burr grinder if you can push the cacao down into the burrs. It may be quite hard to clean between uses though.
Very nice! If there’s a ever a version 2, it should be powered by USB-C PD for cable redundancy
this is an awesome project. kudos!
I have the same project in mind for a while, happy to come across your video.. thank you for sharing your work.
keep it up!
Great work! Were you inspired by Wera Workshops Key grinder?
@@SamCouchman Initial concept was partly inspired by the HG-2 hand grinder, but the Weber key grinder is quite beautiful!
I have been toying with designing and machining my own grinder for a bit now. Lots of great lessons to draw from this. Did you consider the fact that you have multiple beans getting ground at once, and in the larger cone there are a multitude more that the smaller cone you based your torque calculations on?
It's a super fun and rewarding project! I think my biggest mistake in a design sense was making poor assumptions about the torque relationship between smaller and larger burrs. It's clearly not a linear relationship based on burr radius. I think it depends much more on the specific geometry between the inner and outer burrs as each bean is crushed, something that's very hard to model or calculate. If I were to do it over, I'd make a simple 3d printed setup with the big burrs a hand crank to measure the torque, then spec a motor based on that info. Windshield wiper motors should have enough torque when paired with a gear/pulley system but they also don't provide torque info so you'd need to measure the motor torque. Hope this helps.
Hey there, a very cool project. How is the consistency?
Hey there, I have not done any fancy measurement of grounds sizing, but espresso shots with my Breville machine have been very consistent
how did you get the burrs? Did you purchase them?
Yep, found them on eBay
I've finding ways to grind chocolate on table top, I got a flat burr coffee grinder but the chocolate just stuck inside the grinding burr 😅
@@MeilingZhao Interesting idea! It's possible that a conical burr grinder may work better than a flat burr grinder if you can push the cacao down into the burrs. It may be quite hard to clean between uses though.
Legend
can i get that solid file?
Please yes! I want it too
@@singhrustam dont try to wait man, he doesn not respond