I have had a lot of success with O Flute bits on aluminium, however there seems to be a lot of information about getting a better finish with 2 flute bits.

I have tried a few different brands, all designed for aluminium but I just keep getting my bits gummed up or rubbing.

Using feed and speed calculators, the values seem really high. I have tried pretty much from 10k rpm to 18k rpm with 100-800mm/min speeds - just about every possible combo in between up and down on not rpm and feed speeds.

I know the obvious solution is “if o flute upcut is working fine then just keep doing that” but I have some mental health issues and not being able to figure this out is causing a lot of stress. Only asking for help so I can try and return to a regular sleeping pattern.

I really need to get a grip and be ok with not knowing the reason for everything, and I promise I will get help on that.. but for now can anyone offer any insight into what I can try next to get 2 flute cuts working?

Really appreciate any help.