Abstract: A method for optimizing rock drilling, wherein the drilling is adjusted by means of one or more adjustable parameters such as the feed rate and the rotation rate. In the method, a set value (H.sub.s) of each adjustable parameter is deviated in accordance with a sinusoidal curve while integrating a change caused by the deviation in the penetration rate (x) and adding it to the set value (H.sub.s) so that the set value (H.sub.s) shifts closer to an optimum penetration rate (x.sub.opt).

Abstract: A method of controlling a rock drilling process by adjusting the percussion power and the feed force of a drilling machine. In the method, the drilling is carried out automatically in stages so that the percussion power and the feed force as well as drilling time or drilling depth are adjusted at a start-up drilling stage, and the ratio between the percussion power and the feed force is adjusted at a transition stage while increasing them until the set value of normal drilling is achieved. In normal drilling, the feed force is adjusted so that the rotation power remains at the set value.