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.roneverhart.com/Castello-di-Amorosa-Il-Barone-Napa-Valley-Cabernet-Sauvignon-2007/