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<p>[QUOTE="Kentucky, post: 1494909, member: 33176"]About rock tumblers. If you use them the other way around, they are called ball mills. When I worked in magnetic recording tape production, ball mills were still used to "grind" the magnetic paint that would be applied to the plastic film. Instead of the "balls" getting smooth from the abrasive powder, smooth balls were used to reduce the size of the chunks in the abrasive powder (which for magnetic tape was gamma iron oxide). I worked for Ampex, and some of our mills used original "balls" which were Normandy Beach flint pebbles. They turned into beautiful polished stones.[/QUOTE]</p><p><br /></p>
[QUOTE="Kentucky, post: 1494909, member: 33176"]About rock tumblers. If you use them the other way around, they are called ball mills. When I worked in magnetic recording tape production, ball mills were still used to "grind" the magnetic paint that would be applied to the plastic film. Instead of the "balls" getting smooth from the abrasive powder, smooth balls were used to reduce the size of the chunks in the abrasive powder (which for magnetic tape was gamma iron oxide). I worked for Ampex, and some of our mills used original "balls" which were Normandy Beach flint pebbles. They turned into beautiful polished stones.[/QUOTE]
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