Anas, Khairil, Budha Maryanti, and Kuswandi Arifin. 2022. “Analysis Comparison Of Spindle Rate Surface Roughness AISI 4140 Using Face Mill: Surface Roughness”. Jurnal Rekayasa Mesin Dan Inovasi Teknologi 3 (2):201-7. http://jurnal.ftm.uniba-bpn.ac.id/index.php/REMIT/article/view/45.