General remarks about the downhole process under study. A modern diamond impregnated crown can work downhole in two different modes: in perfect and imperfect diamond exposure at the face of the crown. This provision applies not only to impregnated and multilayer crowns, but also to single-layer crowns operating under forced feed ...

The rate of penetration in hard rock drilling depends on the geometric shape of cutters. The penetration process when drilling hard rocks with a cylindrical crown with sharpened cutters of plate form was first considered by E. F. Epstein.

The paper considers the basic solution of the sinking rate problem based on the theoretical provisions stated earlier. The solution is based on the constancy of the cutter contact area during drilling time, on the division of the depth of the contact area introduction into two parts - upper and lower.

The problem of the rate of penetration in rotary drilling of hard rocks with a sharpened cutter is reduced to the establishment of the general dependence of penetration H on time t at given parameters of the drilling mode: axial load c₀ and the number of revolutions n and to determine the initial rate of penetration v₀ ...

Development of diamond deposits in Yakutia and production of synthetic diamonds attract the attention of specialists to the possibility of wider application of diamond bits for drilling exploration and production and explosive boreholes, especially in very hard rocks ...