Cutter Wheel

Any rotating tool or system of tools on a common support thatexcavates at the face of a bore.

Cutterhead

Any rotating tool or system of tools on a common support that excavates at the face of a bore. Usually applies to mechanical methods of excavation.

Cutting Bit (Cutterhead)

The actual teeth and supporting structure that is attached to the front of the lead auger, drill stem or front face of the tunnel boring machine. It is used to reduce the material that is being drilled or bored to sand or loose dirt so that it can be conveyed out of the hole. Usually applies to mechanical methods of excavation, but may also include fluid jet cutting.