well then ill put my .02 in what aluminum alloy? what quantity of material to remove whats the power of the spindle and whats the fastest effective machining feed of the machine? all of that considered for 5000, 6000 series any T condition I prefer 2 flute endmills as fast as the spindle can turn 10k is preferable :) at about .004 feed per tooth but is this situation capable of those numbers? and for the 2000 and 7000 series I prefer 4 flutes as they reduce the chipload and increase my ability to feed although at 10k spindle i am out of feed at 350 ipm ( of course all of this is at work as my machine simply lacks the testicular fortitude to do this with also with an 8mm endmill i would probably keep chipload per tooth around .002-.003 as for coolant i always flood with blaser but thats what we have, tried some blue stuff once worked great but it would peel your skin off i n a few days
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