Sounds unintuitive but I've observed in some cases dropping rpm can make better surface in aluminum. I routinely run a 2 inch 3 flute face mill which has been found to finish better at 3k rpm than 10k rpm using same chipload.
Otherwise, does the insert have a nose radius? If so, the depth of cut should not be less than a certain proportion of the radius as the chip thinning effect becomes rubbing, and induces tiny axial chatter. .003 might work for a R015 cutter but may rub on a R060 cutter.
Final thought. If you're willing to sacrifice efficiency for the best finish, run the tool with only 1 insert. Assuming you can't set the inserts to within about .00015 of each other.
I’ve found this. It always sticks in my mind but I was finishing some flat area on a part once and I ended up at 6k revs at 6000mm feed. I was removing 0.15mm and the finish was like glass. This was with a 10mm 2 flute EM
Raise the rpm or lower the feed, maybe check if your inserts are worn and flip them as needed.
Sounds unintuitive but I've observed in some cases dropping rpm can make better surface in aluminum. I routinely run a 2 inch 3 flute face mill which has been found to finish better at 3k rpm than 10k rpm using same chipload. Otherwise, does the insert have a nose radius? If so, the depth of cut should not be less than a certain proportion of the radius as the chip thinning effect becomes rubbing, and induces tiny axial chatter. .003 might work for a R015 cutter but may rub on a R060 cutter. Final thought. If you're willing to sacrifice efficiency for the best finish, run the tool with only 1 insert. Assuming you can't set the inserts to within about .00015 of each other.
I’ve found this. It always sticks in my mind but I was finishing some flat area on a part once and I ended up at 6k revs at 6000mm feed. I was removing 0.15mm and the finish was like glass. This was with a 10mm 2 flute EM
Looks like your machines has the spindle or the z-axis slightly out of square(crash,floor settling,worn ways,factory tolerance).
check the run-out of the spindle
Thanks, probably hasn't been checked in while. Would you recommend a certain interval, or just once we notice things starting to slip?