TNMG 1604 Carbide inserts with a highly polished surface that is ultra sharp suitable for machining aluminium. These cutters are a really good solution for any type of nonferrous materials and plastics. If you are machining aluminium then I highly recommend this insert.
starting cutting condition parameters:
Feedrate 0.15-0.30 mm/rev
Vc 100-160 mm/min
Ap (depth of cut) 1-3 mm (you can take a full width cut if your lathe will handle it.)
with cutting conditions somewhere in there you should get nice chip breaking and tool life.
We normally use 5 mm depth of cut and 0.30 mm/rev feedrate when using a .8 mm radius insert.