Definition - What does Cutting bit mean?
A cutting bit is 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. The cutting bit is made of a variety materials according to the composition of the materials the bit is expected to encounter.
Trenchlesspedia explains Cutting bit
Choosing the proper cutting bit is crucial to a successful trenchless pipe installation. Tri-cone and rotary cone bits are the most commonly used cutting bits. Ideally, the cutting bit will will reduce the material to sand or loose dirt so that it can be easily excavated from the bore. Often, during the drilling phase, several drill bits need to be used as different materials are encountered. The cutting bit and the drill stem it is connected to can be pushed or pulled by the boring machine as it creates or enlarges a bore.