Abstract: Disclosed is an articulated apparatus for positioning a rock drill comprising a self-propelled vehicle having a chassis propelled by endless tracks, a carriage for carrying an engine for driving the tracks, and a rotary drive for power actuated rotation of the carriage relative to said chassis through a full 360.degree. about an upright first axis. A boom is mounted with one end at the carriage for power actuated pivoting thereon about a second axis perpendicular to the upright first axis. An arm is carried by another end of the boom for power actuated pivoting thereon about a third axis parallel with the second axis. A feedshell is provided for guiding and reciprocating a rock drill toward and away from a drill point entry location adjacent to one end of the feedshell.