Given the application of a multiple regression and artificial neural networks (ANNs). this paper describes development of models for predicting surface roughness. linking an arithmetic mean deviation of a surface roughness to a torque as an input variable. in the process of drilling enhancement steel EN 42CrMo4. https://www.bekindtopets.com/limited-value-Zury-Sis-Beyond-5-Hand-Tied-Part-Lace-Wig-BYD-LACE-H-CHILL-top-savings/