Abstract: The grinding machine comprises a frame, a stationary table for supporting a grinding-wheel carriage, and a bed for supporting a movable table. The workpiece to be ground is mounted between a headstock and a tailstock which are carried by the movable table. The grinding-wheel is fixed on a sleeve which is freely mounted for rotation on a shaft, the two ends of which are rigidly fixed respectively in two supports mounted on the grinding-wheel carriage directly above the carriage slideways.

Abstract: A rotating element such as a grinding-wheel sleeve rotatably mounted on a stationary central shaft is provided with a plurality of annular balancing chambers which communicate permanently with a source of oil under pressure by means of a common calibrated constriction and with a source of compressed air by means of individual screw-type regulating pintles, each chamber being also connected to a return duct through a constriction.

Abstract: The grinding machine comprises a frame having an upper portion in the form of a stationary table for supporting a grinding-wheel carriage, and a bed provided with slideways for supporting the headstock and tailstock between which is mounted the workpiece to be ground. In order to facilitate drainage of water from the surfaces of the machine, the top uncovered edge surfaces of the bed are downwardly inclined towards the interior of the bed in which ducts are provided for collecting the water within a discharge chute.

Abstract: The device comprises two rotary carrier-plates each fitted with a carriage which is equipped with a chuck for gripping one end of a crankshaft and which is adapted to move on a diametral guide of the carrier-plate. The plane of the axes of the crankpins is located in the plane of displacement of the axes of the jaws on each side of the axis of rotation of the carrier-plates at a distance equal to the radius "r" of rotational motion of the crankpins for the successive grinding of the outer crankpins and of the inner crankpins.The invention is applicable to machines for grinding the crankpins of crankshafts having four crankpins located in the same plane.

Abstract: The grinding machine essentially comprises a frame on which a grinding-wheel slide is capable of moving towards a workpiece carried by a sliding table designed in two separate parts or table components, one of which is adapted to carry a headstock while the other carries a tailstock. The two table components are provided with means for controlling their movements in opposite directions and the tailstock table component is subjected to the action of a restoring spring for urging it towards the headstock table component.