Boring apparatus for drilling laser guided microbore tunnels uses a liquid
stream to remove soil as slurry and an airstream to conduct the slurry
away from the bore head. The cylindrical head houses a drill shaft
steered by a pair of remotely controlled rams according to the position
of a laser spot on a target fixed close to the end of the drill shaft.
Small arcuate steering movements shift the cutter up and down through a
first ram alongside the shaft working through a linkage. Side to side
steering is provided by a second ram acting directly on the shaft. The
components are mounted on an axial base wall which gives repair access
and camera view of the target. A drilling platform has rams for advancing
the cylindrical head.