Ball Mill

This ball mill was made for grinding sand and cleaning objects like rusty bolts. It works but takes a very long time to grind sand down, this is because of the size of the balls are too small. Getting larger balls will help.
Some professionals that design and manufacture mill for industry helped in the design of the lifter and the correct speed for milling. The professionals were interested in how long it would take for the lining of the mill to be worn out. This is yet to be tested.
http://tinkersprojects.com/project/3d-printed-ball-mill/

see more what I have done: http://tinkersprojects.com/



Circuit and program
https://github.com/tinkersprojects/Ball-Mill

Videos
https://youtu.be/u7eSL-mbXYQ
https://youtu.be/6Afjj5jZ74U

Operation:
After powering the mill with 12V DC power, settings can be seen/changed using the LCD and can be altered using the 3 buttons (up, down and enter). Speed and duration are the 2 settings that can be set to control the mill. While the mill