For a ballmill, you want it to be a large diameter & small width.
The balls have to rotate with the side of the ballmill, then at almost the top, drop down onto the scrap at the bottom of the mill & crush the scrap.
Like in the wiki picture
http://en.wikipedia.org/wiki/Ball_mill
A rock polisher or small dia ballmill is just going to polish the scrap untill its dust, that'l take ages.
So, maybe 3 foot dia & 10 inches wide
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