That someone is me. I used a single flute ball from Datron on my salt and pepper shakers that I entered into the latest contest. Since single flutes are usually not balanced they can cause vibration, especially with the big ones. Vibration is your enemy when you are doing finishing toolpaths which is what a ball endmill is mostly used for. 2 flutes for finishing in aluminum will work great. Just be sure to keep your chipload high enough. Chip thinning can play a big factor here as well.
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