Optimization of Milling Process by Taguchi-PSI Method He Le Hoang Anh, Trinh Kieu Tuan, Nguyen Huu Quang, Nguyen Huu Luan, Tran Minh Truong and Nguyen Thi Quoc Dung E3S Web Conf., 309 (2021) 01019 Published online: 07 October 2021 DOI: 10.1051/e3sconf/202130901019