Cutting apparatus

A cutting head for a cutting apparatus suitable for creating tunnels or subterranean roadways and the like, said cutting head having a cylindrical configuration and comprising:

• a rotatable cutting head body;
• a plurality of annular shaped roller cutters mounted at a circumferential perimeter of the cutting head and including a sharp annular cutting edge configured specifically for undercutting the rock;
• and
• a plurality of cutting units mounted on the cutting head body, the cutting units each having a casing and a shaft, said cutting units including at least first and second different types of cutting units, the first type of cutting unit having a first rotatable cutter including a first disc body and a first arrangement of buttons for abrading rock, said first arrangement of buttons being mounted in a radially peripheral portion of the first disc body and protruding outwardly therefrom, and the second type of cutting unit having a second rotatable cutter having a second disc body and a second arrangement of buttons for abrading rock, said second arrangement of buttons being mounted in a radially peripheral portion of the disc body and protruding outwardly therefrom, wherein the at least first and second different types of cutting units are different from one another by at least the arrangements of the respective buttons, wherein the first rotatable cutter has a number of buttons that is different from a number of buttons of the second rotatable cutter.