So attached are pics of steel and aluminum with the type of surface finishes I get on my CNC'd BP. For steel I'm using a 9/16" HSS Center cut endmill 4 flute at about 1000 rpm and just skim cuts to level it out and 8 ipm., for the Aluminum I'm using a 2 flute 3/4" end mill 2500 rpm and 12 ipm. I'm running the feedrate slow to get it to be milled completely flat.
So the question is how do I get better finishes on these types of material? Here is an indexable cutter would this work better? If so what angle they have 45 and 90 degree inserts? Also what feed and speeds?