Single flute all the way with 6040 machines. Tried others, but my machine cant handle it. I think the grade Im cutting the most in is 6082, but I also have some unknown 5mm plate which is very sticky, but the speeds also work well on that.

Each machine, especially our type, varies so much in quality that we probably get different optimal speeds and feeds. I know the settings I posted is right for my machine because:
#1 the finish is great
#2 the sound when it cuts is like music to my ears
#3 the cutters last forever. (been on the same cutter since november, and cutting aluminium 10-20h a week.

WD40 is good stuff, but it is more messy than alcohol, which I get for free from work.


Cutting is one part of this, but fixturing sometimes takes the longest time to figure out. Try different methods and go with what works for you. I often use screws into the spoilboard to keep things in place and flat.