Abstract: A rotary drill bit for engaging an earth strata material includes an elongate drill bit body having an axial forward end and an axial rearward end, and a cutting insert attached to the axial forward end of the elongate drill bit body. The cutting insert has an elongate insert body rotatable about a central axis and includes a pair of symmetrical halves symmetrical about the central axis, each symmetrical half including a leading face, a top surface having a relief surface, a T-land surface extending between the leading face and the relief surface and a cutting edge formed at the intersection of the T-land surface and the relief surface. The cutting edge can have a negative axial rake angle. The relief surface can include a primary relief surface and a secondary relief surface.

Abstract: A flat cutter bit for engaging an earth strata material includes a non-rotatable shank portion, a head portion integrally formed with the non-rotatable shank portion and including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes a body having an angled leading face, a top surface having a relief surface, a T-land surface extending between the angled leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.

Abstract: A radial cutter bit includes a non-rotatable shank portion, a head portion including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes a body having a leading face, an opposing trailing face, a first side and a second side. The leading face has a central face portion, a first side face portion extending toward the first side of the body and a second face portion extending toward the second side of the body. The cutting insert further includes a top surface having a relief surface, a T-land surface extending between at least a portion of the leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.

Abstract: A cutting tool mounting assembly adapted for attachment to a surface of a rotatable driving member of a cutting tool machine. The cutting tool mounting assembly includes a tool holder having a key shank, a base attached to the surface of the rotatable driving member with the base having a mounting groove for receiving the key shank of the tool holder, and a resilient retention structure configured to interact with the base and the tool holder to facilitate a friction fit between the tool holder and the base.

Abstract: A cutting tool mounting assembly adapted for attachment to a surface of a rotatable driving member of a cutting tool machine. The cutting tool mounting assembly includes a tool holder having a key shank, a base attached to the surface of the rotatable driving member with the base having a mounting groove for receiving the key shank of the tool holder, and a resilient retention structure configured to interact with the base and the tool holder to facilitate a friction fit between the tool holder and the base.

Abstract: A cutting bit includes an elongate body having a shank portion and a head portion with a forward end. The head portion has an annular channel defined therein adjacent to and rearwardly of the forward end of the head portion. The annular channel has an angled bottom surface. The cutting bit also includes a split wear ring positionable in the annular channel and structured and arranged to be retainably held in the annular channel. The cutting bit further includes a hard cutting tip affixed to the forward end of the head portion.