My machine rapids at ~25 IMP, well below the suggested speeds for speed feed/calculation for small end mills.
My spindle can be set to 10,400 RPM. I tried some 1.5mm cutters (4-flute) at max rpm, 20 IPM, 0.5mm cut depth, in 6061 and it worked but the finish was quite poor and the cutters didn't last long (they were quite cheap though)
An suggestions? Do I need to give up on 1.5mm and move up to 3/32"? Do I need to switch to a certain type/style of end-mill?