| 摘要 |
An indexable cutting insert has opposing rhombus-shaped upper and lower surfaces and a peripheral side surface therebetween with alternating obtuse and acute corner surfaces. A nose cutting edge is formed at the intersection of the upper surface with each of the two acute corner surfaces. The lower surface includes a base surface from which a central boss and exactly two engagement ridges protrude. Each engagement ridge extends from the central boss to intersect with its respective acute corner surface, and the base surface is divided into two base sub-surfaces. The insert may be clamped against a seating surface of a tool holder pocket solely by the engagement ridge located closest to the operative nose cutting edge making contact with a corresponding single engagement groove, and the two base sub-surfaces making contact with two coplanar raised support surfaces.
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