Assuming a plasma torch of sufficient power, why would we need to pull out a plug? Why not just set it to maybe a few cm depth per pass and use the PLC (computer) to “paint” inside the circle? By eliminating the gigantic metal cutters and the torque required to drive them, the machinery size, cost, and complexity goes way down, along with maintenance scheduling. I’m sure that how far a machine could “bore” through solid rock in a day would shoot through the roof.
