Cutting apparatus suitable for creating tunnels or subterranean roadways and the like comprising: a support structure having generally upward, downward, frontward and side facing regions; first and second cutting assemblies, each of the first and second cutting assemblies including a rotatable cutting head and a mounting assembly, the mounting assembly attaching the cutting head to the support structure in a manner that enables the cutting head to move with respect to the support structure, said mounting assembly including a first pivot axis wherein the cutting head is movable about the first pivot axis thereby enabling the cutting head to move in a generally sideways direction relative to support structure, said mounting assembly including a second pivot axis wherein the cutting head is movable about the second pivot axis thereby enabling the cutting head to move in a generally upwards-downwards direction relative to the support structure; wherein each of the cutting heads includes a plurality of cutting units, each cutting unit includes a rotatable shaft having a central longitudinal axis and a cutter mounted on the shaft, said cutter including a disc body and a plurality of buttons for abrading rock, said buttons are mounted in a radially peripheral portion of the disc body and protrude outwardly therefrom, wherein at least some of the buttons each have a central longitudinal axis that subtends an angle α with respect to a reference axis, which extends perpendicularly outwards from the central longitudinal axis of the shaft, wherein the angle α is greater than or equal to 20° and less than or equal to 34° wherein the disc body has a recessed underside to reduce frictional engagement between the disc and a rock face during a cutting operation, the underside of the disc includes a sloping annular surface that slopes inwardly into the disc body from a radially peripheral part of the disc towards the central axis of the shaft, wherein the sloping annular surface subtends an angle γ with respect to a reference axis, which extends perpendicularly outwardly from the central longitudinal axis of the shaft, wherein the angle γ is greater than or equal to 2°, wherein the radially peripheral portion of the disc body includes a first annular surface, said first annular surface sloping inwardly and upwardly towards the central longitudinal axis, and wherein the first annular surface subtends an angle β with a reference axis that is parallel to the central longitudinal axis of the shaft, wherein the angle β is greater than or equal to 5°. a support structure having generally upward, downward, frontward and side facing regions; first and second cutting assemblies, each of the first and second cutting assemblies including a rotatable cutting head and a mounting assembly, the mounting assembly attaching the cutting head to the support structure in a manner that enables the cutting head to move with respect to the support structure, said mounting assembly including a first pivot axis wherein the cutting head is movable about the first pivot axis thereby enabling the cutting head to move in a generally sideways direction relative to support structure, said mounting assembly including a second pivot axis wherein the cutting head is movable about the second pivot axis thereby enabling the cutting head to move in a generally upwards-downwards direction relative to the support structure; wherein each of the cutting heads includes a plurality of cutting units, each cutting unit includes a rotatable shaft having a central longitudinal axis and a cutter mounted on the shaft, said cutter including a disc body and a plurality of buttons for abrading rock, said buttons are mounted in a radially peripheral portion of the disc body and protrude outwardly therefrom, wherein at least some of the buttons each have a central longitudinal axis that subtends an angle α with respect to a reference axis, which extends perpendicularly outwards from the central longitudinal axis of the shaft, wherein the angle α is greater than or equal to 20° and less than or equal to 34° wherein the disc body has a recessed underside to reduce frictional engagement between the disc and a rock face during a cutting operation, the underside of the disc includes a sloping annular surface that slopes inwardly into the disc body from a radially peripheral part of the disc towards the central axis of the shaft, wherein the sloping annular surface subtends an angle γ with respect to a reference axis, which extends perpendicularly outwardly from the central longitudinal axis of the shaft, wherein the angle γ is greater than or equal to 2°, wherein the radially peripheral portion of the disc body includes a first annular surface, said first annular surface sloping inwardly and upwardly towards the central longitudinal axis, and wherein the first annular surface subtends an angle β with a reference axis that is parallel to the central longitudinal axis of the shaft, wherein the angle β is greater than or equal to 5°.