Abstract: In a numerically controlled machine tool which has a linear feed axis and a rotational feed axis and in which a main spindle and a table are movable relative to each other, a position error and an attitude error produced by an operation of a linear feed axis and a rotational feed axis are measured at a plurality of measurement points set within a movable range of the linear feed axis and the rotational feed axis, and the position error and the attitude error thus measured are stored as an error map in correspondence to a position of the linear feed axis and a rotation angle of the rotational feed axis.

Abstract: A numerically controlled machine tool has a linear and rotational feed and has functions for measuring in advance, errors of a relative position and a relative attitude of a main spindle relative to a work table by positioning the linear and rotational feed axes to specified position and attitude, and correcting a movement command based on measured error data, the data being multi-dimensional data containing a position error and an attitude error. The machine tool includes a error data storage means which store an error map prepared by collecting a plurality of the error data corresponding to positions and rotation angles of the linear and rotational feed axes, and a correction data computing means which compute correction data for correcting movement command from a command position for the linear and rotational feed axes and the error data stored in the error data storage means.

Abstract: In a numerically controlled machine tool which has a linear feed axis and a rotational feed axis and in which a main spindle and a table are movable relative to each other, a position error and an attitude error produced by an operation of a linear feed axis and a rotational feed axis are measured at a plurality of measurement points set within a movable range of the linear feed axis and the rotational feed axis, and the position error and the attitude error thus measured are stored as an error map in correspondence to a position of the linear feed axis and a rotation angle of the rotational feed axis.

Abstract: A numerically controlled machine tool which has a linear feed axis and a rotational feed axis and which has functions for measuring in advance, errors of a relative position and a relative attitude of a main spindle relative to a work table by positioning the linear feed axis and the rotational feed axis to specified position and attitude, and correcting a movement command based on measured error data, the error data being multi-dimensional data containing a position error and an attitude error. The machine tool includes a error data storage means which store an error map that is prepared by collecting a plurality of the error data corresponding to positions and rotation angles of the linear feed axis and the rotational feed axis, and a correction data computing means which compute correction data for correcting the movement command from a command position for the linear feed axis and the rotational feed axis and the error data stored in the error data storage means.

Abstract: An ink jet printing apparatus is disclosed which includes a printing head having a plurality of ink ejection nozzles and adapted to be moved relatively to a recording medium for effecting printing or characters of figures in accordance with print instruction signals, the printing head being periodically displaced, in accordance with a timing signal from a timer, to a fixed position at which an ink failure preventive ejection is performed from the nozzles in response to a detecting signal delivered from a detector upon detecting the positioning of the head at the fixed position.