A mining machine including a frame, a cutting head moveably coupled to the frame and pivotable about an axis that is substantially perpendicular to a first mine surface, and a first actuator for stabilizing the frame relative to the first mine surface. The first actuator is coupled to the frame and includes a first end extendable in a first direction to engage the first mine surface. The extension of the first actuator is automatically controlled based on measurements of at least one indicator of the force between the first actuator and the first mine surface.

A rackbar for a mining machine has a body including a first end and second end, an inner rack wall, an outer rack wall spaced from the inner rack wall, a plurality of gear teeth extending between the inner rack wall and the outer rack wall, an extension disposed adjacent the first end, a pin aperture positioned on the extension, and a rib extending along a surface of the extension. The inner and outer rack walls extend between the first end and the second end parallel to a rack axis. The extension extends in a direction perpendicular to the rack axis. The pin aperture is configured to receive a pin.

A rackbar for a mining machine has a body including a first end and second end, an inner rack wall, an outer rack wall spaced from the inner rack wall, a plurality of gear teeth extending between the inner rack wall and the outer rack wall, an extension disposed adjacent the first end, a pin aperture positioned on the extension, and a rib extending along a surface of the extension. The inner and outer rack walls extend between the first end and the second end parallel to a rack axis. The extension extends in a direction perpendicular to the rack axis. The pin aperture is configured to receive a pin.

A mining machine including a frame, a cutting head moveably coupled to the frame and pivotable about an axis that is substantially perpendicular to a first mine surface, and a first actuator for stabilizing the frame relative to the first mine surface. The first actuator is coupled to the frame and includes a first end extendable in a first direction to engage the first mine surface. The extension of the first actuator is automatically controlled based on measurements of at least one indicator of the force between the first actuator and the first mine surface.

A mining machine including a frame, a cutting head moveably coupled to the frame and pivotable about an axis that is substantially perpendicular to a first mine surface, and a first actuator for stabilizing the frame relative to the first mine surface. The first actuator is coupled to the frame and includes a first end extendable in a first direction to engage the first mine surface. The extension of the first actuator is automatically controlled based on measurements of at least one indicator of the force between the first actuator and the first mine surface.

A mining machine including a frame, a cutting head moveably coupled to the frame and pivotable about an axis that is substantially perpendicular to a first mine surface, and a first actuator for stabilizing the frame relative to the first mine surface. The first actuator is coupled to the frame and includes a first end extendable in a first direction to engage the first mine surface. The extension of the first actuator is automatically controlled based on measurements of at least one indicator of the force between the first actuator and the first mine surface.

A mining machine including a frame, a cutting head moveably coupled to the frame and pivotable about an axis that is substantially perpendicular to a first mine surface, and a first actuator for stabilizing the frame relative to the first mine surface. The first actuator is coupled to the frame and includes a first end extendable in a first direction to engage the first mine surface. The extension of the first actuator is automatically controlled based on measurements of at least one indicator of the force between the first actuator and the first mine surface.

A sensor system of underground mining vehicles, which system is arranged to be fastened at a perimeter of an underground mining vehicle, comprising a sensor (1) and a stand (2), wherein the stand comprises a mounting plate (3) for fastening the stand (2) to the underground mining vehicle, a movable plate (4) fastened moveably to the mounting plate (3), a guard member (7a, 7b, . . . ) fastened to the movable plate (4), and a biasing member (9a, 9b, . . . ) fastened between the movable plate (4) and the mounting plate (3). The sensor (1) is fastened to the movable plate (4). The movable plate (4) has two positions: a resting position, and a retracted position, and the biasing member (9a, 9b, . . . ) is biasing the movable plate (4) to the resting position.

A sensor system of underground mining vehicles, which system is arranged to be fastened at a perimeter of an underground mining vehicle, comprising a sensor (1) and a stand (2), wherein the stand comprises a mounting plate (3) for fastening the stand (2) to the underground mining vehicle, a movable plate (4) fastened moveably to the mounting plate (3), a guard member (7a, 7b, . . . ) fastened to the movable plate (4), and a biasing member (9a, 9b, . . . ) fastened between the movable plate (4) and the mounting plate (3). The sensor (1) is fastened to the movable plate (4). The movable plate (4) has two positions: a resting position, and a retracted position, and the biasing member (9a, 9b, . . . ) is biasing the movable plate (4) to the resting position.

A rackbar for a mining machine has a body including a first end and second end, an inner rack wall, an outer rack wall spaced from the inner rack wall, a plurality of gear teeth extending between the inner rack wall and the outer rack wall, an extension disposed adjacent the first end, a pin aperture positioned on the extension, and a rib extending along a surface of the extension. The inner and outer rack walls extend between the first end and the second end parallel to a rack axis. The extension extends in a direction perpendicular to the rack axis. The pin aperture is configured to receive a pin.