Patent ID: 8434974

Claim:
A rotary milling cutter comprising: a shaft having a central, rotational axis; a tool head having a central, rotational axis being disposed substantially coaxially to said central, rotational axis of said shaft; said shaft being connected to said tool head to drive and rotate said tool head; said tool head comprising an end face disposed opposite said shaft; said tool head comprising a peripheral side surface being disposed about the periphery of and to extend substantially axially away from said end face toward said shaft; a plurality of indexable inserts mounted on the peripheral side surface of said tool head; each of said indexable inserts comprising a first partial body and a second partial body, each partial body having a general shape of a truncated pyramid with a polygonal base and a top surface; said first partial body comprising a plurality of roughing edges for rough machining of a workpiece; said second partial body comprising a plurality of finishing edges for finish or smooth machining of a workpiece; said first and second partial bodies are joined together at the top surface of the truncated pyramid and are rotated relative to one another about a central axis of the indexable insert in such a way that one of the plurality of finishing edges of the second partial body is closer to the workpiece relative to one of the plurality of roughing edges of the second partial body; each of said indexable inserts being positioned on said peripheral side surface of said tool head in such a way that said polygonal base of said first partial body faces away from said tool head and said polygonal base of said second partial body faces toward said tool head to enable one of the plurality of roughing edges of said first partial body and one of the plurality of finishing edges of said second partial body to engage the workpiece.