So I did look around the forum
@ApolloCrowe gives out TPS files with his tutorials, which is great, thanks, but I didn’t see one for aluminum
This guy @zymurgy here First aluminum job is using 8000 RPM 16 in/min feed 8 in/min plunge, faster than my numbers, but with a smaller stepdown and much less complicated geometry. He claimed to have gotten the numbers from G-Wizard. @ApolloCrowe call the numbers aggressive
@mitchell http://community.carbide3d.com/t/recommended-speeds-and-feeds-for-aluminum says 5 and 1 works but is slow. @robgrz suggested 10-12 for feed. @WillAdams links to the same Shapeoko page I was reading
Plugging the numbers myself into FSWizard gives me 20 inch/min feed. From all that I’ve read around here, calculator software cannot be fully trusted yet, at least not for the Nomad, and experience trumps all.
I’ve 
hacked MeshCAM to give me the Carbide Wizard option for aluminum, with the highest quality setting, it’s telling me 12.2 inch/min feed, 1.52 inch/min plunge, 0.01 inch stepdown, spindle RPM will be 7500
What do you think of those numbers?