The theory of KM2O-Langevin equations and its applications to data analysis (I): Stationary ana

An arrangement for controlling the drilling functions of a full profile rock drill in which the speed of rotation of the cutting head and the feed force of the cutting head are controlled so that the rate of penetration of the drill bit reaches its optimum rate as a function of the feed force. The full profile of drilling apparatus has a part of the cutting head in which cutters are freely rotatable. The change of the rate of penetration of the cutting head into the rock is measured during the drilling operation, and the drilling functions are controlled on the basis of the measured results so that the cutting head feed force is either increased or decreased.