Manual

46
3. Turning
Edge rounding
A small edge rounding (ER) gives lower cutting forces in all
directions. This means easier cutting action and less deection of
the tool. Ground inserts have smaller edge rounding than direct
pressed inserts, which is true also for uncoated or thin-coated
inserts.
M = Direct pressed inserts G = Ground insert, normally with
smaller ER
E = Ground insert for closer
tolerances and sharp edge