Drill with indexable inserts

摘要

An indexable insert (1) for a drill includes a chip breaker (7) for disposing chips, provided at an upper face (2) thereof along a cutting edge (6). The chip breaker (7) has at least one recess (8). The recess (8) is retracted from an end of the chip breaker (7) near the cutting edge (6) toward the center of the insert by 0.2 mm or greater, or an end of the recess (8) near a center hole (5) of the insert communicates with the center hole (5).