The mathematical model of mechanical drilling speed for fractured rocks for serial and experimental bits (bits with solid matrix and flushing channels in the body) was built. As a result of the analysis of mathematical models, methodological recommendations for drilling with pilot bits, for which the existing recommendations for drilling fractured rocks with serial (with sectoral matrix) diamond bits can be used, are proposed. In order to build a regression model of mechanical drilling rate for fractured rocks, prototype and production drill bits were made. The matrix of the pilot bit was made solid, and radial flushing channels were made in the body. The drill bits were tested at the drilling stand of the St. Petersburg Mining Institute.