From a popular F&S calculator tweaked for my machine (see my build log) in 1060 (no 1050 option sorry) I am getting 19,268 RPM and 684 mm/min using a single flute 6mm carbide cutter (20mm stick out) slotting at 2mm DOC.

I had some 3mm aluminium sheet, which I had before moving onto 6082 and likely to be 10x0 grade that cut OK using the above.

Softer stuff is a pain though.

5083 H112 (a softer variant) is coming up with 17,193RPM and 610mm/min with the other parameters above the same.