Abstract: A rock boring device includes a rotary disc cutter. The disc cutter is driven in an oscillating manner and may be driven or free to nutate, and the device includes a mounting section for the rotary disc cutter and a driven section. The mounting section may be angularly offset from the axis of the driven section whereby the rotary disc cutter can oscillate and/or nutate.

Abstract: An oscillating disc cutter including a cutting disc and a drive mechanism. The drive mechanism includes a drive shaft to effect eccentric oscillation of the cutting disc and a radial bearing disposed to permit relative rotation between the drive shaft and the cutting disc. The cutter further including a hydrostatic axial bearing disposed to react axial forces while accommodating induced rotation of the cutting disc when operatively engaged and to induce a rotational drag thereby limiting rotational peed of the cutting disc when free running. A water pressurized fluid bearing induces a predetermined axial load in the hydrostatic bearing such that a predetermined maximum running clearance in the hydrostatic bearing is maintained.

Abstract: A rock cutting machine including a boom rotatably mounted at a proximal end to a chassis adapted to be placed adjacent a rock face to be cut. The boom extends from the chassis to a distal end adjacent the rock face. A longitudinal boom axis extends between the proximal and the distal ends of the boom and a cutting device is pivotally mounted about a pivot axis adjacent the distal end of the boom. The pivot axis enables wrist movement about the pivot axis by a drive mechanism and is offset from the longitudinal axis of the cutting device.

Abstract: A rock boring device includes a rotary disc cutter. The disc cutter is driven in an oscillating manner and may be driven or free to nutate, and the device includes a mounting section for the rotary disc cutter and a driven section. The mounting section may be angularly offset from the axis of the driven section whereby the rotary disc cutter can oscillate and/or nutate.

Abstract: A rock boring device (10) including a rotary disc cutter (11). The disc cutter (11) is driven in an oscillating manner and also driven or free to nutate, and the device includes a mounting section (22) for the rotary disc cutter and a driven section (21), and wherein the mounting section (22) is angularly offset from the axis of the driven section whereby the rotary disc cutter will both oscillate and nutate.

Abstract: A rock excavating or cutting device including a disc cutter that is driven by drive means to rotate in an oscillating and nutating manner by driving the disc cutter about separate oscillating and nutating axes aa, bb which are angularly offset from one another and which intersect at a point ahead of the disc cutter.