Home built Ball Mill from junk yard parts

[Anonymous]

A ball mill running at the proper speed performs exactly that way, and does not benefit from the bar.

My ball mills are made of propane tanks,with no modifications to them other than the input hole for the material.And they work perfectly.I believe my speed is around 20 rpm.I use two types of crushing media,one is a lead filled mapp gas tank.They come in two sizes,short and fat,or tall and skinny,I am using one of the tall and skinny ones,and it weighs right at 25 pounds.The other media I use is a bunch of 2" round solid steel pieces,3" in length that I call slugs.

only problem with Harold's suggestion is that you'll need 1/2 or more of the drum diameter filled with balls or rods to work properly.

In my research I have found,if you have enough media in the tank,it will rotate over top of itself,creating the "lifter" effect on its own.If I use a few slugs,they tend to slide down as the tank rotates,however if I use about 20 of them,the ones on the bottom tend to push the others up and over themselves.I have never ran my tank half full,actually I can't,my setup would probably not support the weight.

I'm only using 6 balls, and it only takes 2 hours to mill 20 liters of auto cat or mixed IC's into a fine powder.

I have got to try some of those balls,my mill does not work nearly that fast.
It takes about 8 hours to grind 12 pounds of ceramic cpus to powder.Maybe I need to redo my mill.