Make a Ball Mill in 5 Minutes : 4 Steps Instructables
Their small ball mill cost between 70 and 80 dollars. For no more than 30 and in 5 minute you can build a ball mill of appreciable performance. Check out my other Instructables: MAKE A HIGH VOLTAGE SUPPLY IN 5 MINUTES Hack The Spy Ear and Learn to Reverse Engineer a Circuit Super Easy Email Encryption Using Gmail, Firefox and Windows Make a Rechargeable Dual Voltage