Aluminum? Sort of a hijack, but my feeds and speeds are from an OpenBuilds C-beam, so they’re not directly applicable to a Maslow, the C-beam is a small, leadscrew machine that is pretty rigid. With the inexpensive 1/8" single flute bits, I feed 600 mm/minute, ramp plunge at half that, and use a cut depth of 0.3 mm. I adjust the spindle rpm until it sounds “right” and I’m making chips, not powder. Not “screaming”, but not “growling” either. I use a paste wax cutting lube too, but the main thing is getting the chips out of the cut, dust extraction or an air assist are required. Cutting chips over results in a really poor finish.