Crown tools – bits of new generation for cutting a compact rock
Kalukiewicz A., Gospodarczyk P., Kotwica K., Łapa D.

S u m m a r y
Mechanical cutting in the underground mining industry is at present the most popular mining method for coal winning and for driving the opening roadways and development roadways. The method consists in direct impact or static pressing of cutting tool on a solid rock. Energy delivered in such a way is used to overcome internal rock cohesive forces. Rock cutting is most popular winning method, which is realized using cutting tools. Tangential-and-rotational bits are used most frequently to cut compact rocks.