OBRABOTKAMETALLOV Vol. 25 No. 1 2023 technology Fig. 4. Comparison of the frequency spectrum after milling with different angles of inclination, z = 2 (Formulated by the authors) a b c Fig. 5. Frequency spectrum of the acoustic signal: a – spindle acceleration to 8,000 min–1 and stop; b – machining process, z = 1, n = 3,000 min–1; c – machining process, z = 2, n = 1,500 min–1 (Formulated by the authors)
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