Cutting insert for machining

A milling tool, comprising:

• at least one cutting insert containing a cylindrical main body having an axis, a lateral flank, opposing rake faces, and a central region with a depression formed therein, wherein at an intersection of said lateral flank and said rake faces cutting edges being formed, said cutting edges extending circularly as seen in a direction toward said rake faces, said rake faces have an annular region immediately adjacent to said cutting edges, said annular region merging into said depression in said central region, said cutting edges having, in a direction of said axis, in each case at least two convexly curved sections connected together by sections selected from the group consisting of concavely curved sections and substantially straight sections, said cutting insert having four-fold rotational indexibility around said axis of said cutting insert;
• and
• a main tool body configured for receiving said at least one cutting insert in such a manner that a convexly curved section of an active cutting edge being in a cutting position disposed in a radially outer region of the milling tool, while a concavely curved or substantially straight section of said active cutting edge being in the cutting position disposed in a radially inner region of the milling tool.