Go to https://www.cnccookbook.com/10-tips-for-cnc-router-aluminum-cutting-success/ It’s a great resource for cnc stuff and it’s got a section or videos for milling aluminum.
https://www.youtube.com/watch?v=xEdkyE1cV5g is on a mpcnc. USE the collequel cutting option in ESTLCAM
I misspelled the word but it’s a cut that only cuts 40% and the bit goes in circles to remove aluminum. Use a single flute aluminum bit. With the collequel cutting it overlaps and it takes longer but has much less stress on the bit and spindles