Worldwide Leader in Forging, Tunneling & Drilling


A technology that allows the connection of different underground levels with precision, ease in removing debris and with much less impact compared to the conventional use of explosives.

This method of mechanized excavation has developed since the 60s in the mining sector for the construction of ventilation shafts and is currently used also in civil construction.

Once a pilot hole has been made, a milling head placed at the deepest level is rotated and pulled by a special machine (Raise Boring Machine / RBM) positioned at the upper level, reaming the pilot hole to the final, desired diameter.

The Palmieri Group supplies both the specific parts (cutters, head, rods and stabilizers) and the complete machines.