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SEM images of the worn surfaces of C-2SB ball nose end mills: rake surface in the initial state (a) after 2 (b); 15 (c) and 30 m (d) correspondingly. The worn flank surface is presented in (e) initial state; (f) after 2 m; (g) 15 m; and (h) 30 m length of cut, correspondingly.
