(57) A directional boring machine (1) for drilling underground ducts, comprising a cutting
bit (3) designed to carry out removal of the material, a chuck (2) connected to the
cutting bit (3) for ensuring rotation thereof about an axis (Z) of its own, a first
actuator (6, 7, 8) designed to cause slewing of the chuck (2) about a first axis (Y)
perpendicular to the axis (Z) of rotation of the cutting bit, and a second actuator
(10, 11) designed to cause slewing of the chuck (2) about a second axis (X) perpendicular
to the first axis (Y) and parallel to a drilling axis (S).
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