how to make a knex ball mill
K''NEX Ball Factory YouTube. Jan 1, 2014 We purchased a lot of KNEX from eBay until we had enough to make this. K''nex Ball Mill Very Easy : 5 Steps (with Pictures) Instructables. Apr 26, 2016 I need a ball mill to make aluminum powder for thermit so I made this. I used K''nex because I have a lot of them and they are easy to use.