MINING AND TUNNELING MACHINERY 2KV_A The 2KV-A raise-borer is designed for driving vertical and inclined rise workings in rocks with an ultimate strength scomp= 210 MPa in mines with no hazardous concentrations of gas and dust. Raise workings are driven by boring a pilot hole from top to bottom until entry to the lower level and by boring a drift across the entire section from the bottom upwards. Rock is broken by roller-bit drilling. Parameters Cutting tool diameter, m 1.25/1.5/1.8 Drilling height (depth), m, max 160/185 Pilot borehole drilling diameter, mm 270 Angle of a raise inclination from the horizontal line, rad. (deg.) 1.047-1.83/60-105 Rock holing performance at  sñîmp= 210 MPa, m3/h, min:    - 1.25 m-dia. cutting tool 2.1  - 1.5 m-dia. cutting tool 2.9  - 1.8 m-dia. cutting tool  3.6 Total installed power of electric motors, kW 150.5 including  the cutting tool drive,  KW 120 Overall dimensions of the drilling rig in the working position, mm:    - length 1570  - width 1460  - height 4000 Mass of the raise-boring machine, t, max 63.2 The plant’s design bureau is capable to work out and complete machines also with other equipment depending on customer demands