Abstract: A machine tool includes a time calculation unit calculating the time for a spindle to arrive at a target rotational speed, and the time for a spindle head to arrive at a target position; a comparison unit comparing the time to arrive at the target rotational speed and the time to arrive at the target position; and a drive control unit controlling the drive of the spindle and the drive of the spindle head. The drive control unit controls the drive of the spindle head, when a determination is made that the time to arrive at the target rotational speed is longer than the time to arrive at the target position, such that the time for the spindle head to arrive at the target position is longer than the calculated time to arrive at the target position, and less than or equal to the calculated time to arrive at the target rotational speed. Accordingly, the machine tool can drive the spindle head that is a control object in a power-saving mode.

Abstract: A machine tool includes a time calculation unit calculating the time for a spindle to arrive at a target rotational speed, and the time for a spindle head to arrive at a target position; a comparison unit comparing the time to arrive at the target rotational speed and the time to arrive at the target position; and a drive control unit controlling the drive of the spindle and the drive of the spindle head. The drive control unit controls the drive of the spindle head, when a determination is made that the time to arrive at the target rotational speed is longer than the time to arrive at the target position, such that the time for the spindle head to arrive at the target position is longer than the calculated time to arrive at the target position, and less than or equal to the calculated time to arrive at the target rotational speed. Accordingly, the machine tool can drive the spindle head that is a control object in a power-saving mode.

Abstract: There is provided a machining center capable of simplifying a driving force transmitting mechanism and restraining occurrence of noise and vibration. A machining center having a turret head 20 with a plurality of tools on a turret base 5 includes one tool drive motor for each tool, the tool drive motor rotary driving the corresponding tool independently.

Abstract: There is provided a machining center capable of simplifying a driving force transmitting mechanism and restraining occurrence of noise and vibration. A machining center having a turret head 20 with a plurality of tools on a turret base 5 includes one tool drive motor for each tool, the tool drive motor rotary driving the corresponding tool independently.

Abstract: This invention relates to a control apparatus for numerical control in a cutting machine having a turret which can be rotated to arbitrary positions, and characterized by including means for obtaining turret axis data (?X, ?Z) from reference offset values (X0, Z0) corresponding to a length from a cutting edge to a turret axis B, turret angle data ?, and cutting edge data (m, n), and moving the turret on the basis of these turret axis data (?X, ?Z) to perform a cutting.

Abstract: The present invention is directed to provide a control apparatus for a cutting machine in which offset values on coordinates relative to the cutting machine are indicated, regardless of the position of the turret, and an operator need not calculate the offset values in the cutting process. This invention is characterized in that an X-axis offset value (&Dgr;X) and a Z-axis offset value (&Dgr;Z) of a cutting edge of the cutting tool when the turret 1 has been turned to an arbitrary angle are converted to values on coordinates relative to the cutting machine, and indicated.

Abstract: The present invention is directed to provide a control apparatus for a cutting machine in which offset values on coordinates relative to the cutting machine are indicated, regardless of the position of the turret, and an operator need not calculate the offset values in the cutting process. This invention is characterized in that an X-axis offset value (&Dgr;X) and a Z-axis offset value (&Dgr;Z) of a cutting edge of the cutting tool when the turret 1 has been turned to an arbitrary angle are converted to values on coordinates relative to the cutting machine, and indicated.

Abstract: This invention relates to a control apparatus for numerical control in a cutting machine having a turret which can be rotated to arbitrary positions, and characterized by including means for obtaining turret axis data (&Dgr;X, &Dgr;Z) from reference offset values (X0, Z0) corresponding to a length from a cutting edge to a turret axis B, turret angle data &agr;, and cutting edge data (m, n), and moving the turret on the basis of these turret axis data (&Dgr;X, &Dgr;Z) to perform a cutting.

Abstract: The present invention is directed to provide a control apparatus for a cutting machine in which offset values on coordinates relative to the cutting machine are indicated, regardless of the position of the turret, and an operator need not calculate the offset values in the cutting process. This invention is characterized in that an X-axis offset value (&Dgr;X) and a Z-axis offset value (&Dgr;Z) of a cutting edge of the cutting tool when the turret 1 has been turned to an arbitrary angle are converted to values on coordinates relative to the cutting machine, and indicated.