The CNC machining device 1 includes a tool magazine 20, a spindle 26, an automatic tool replacing device, a CNC controller 32, a sensor head 10 configured to generate measurement data corresponding to a distance from a surface of the object, and a personal computer 40. The sensor head 10 generates measurement data (X, Z) at regular intervals. The CNC controller 32 generates position coordinate data (x, y, z, xθ, yθ, zθ) at regular intervals. The sensor head 10 transmits the measurement data to the personal computer 40 through first radio communication RC1. The sensor head 10 transmits a synchronization signal for synchronizing the measurement data and the position coordinate data to the CNC controller 32 through second radio communication RC2.

A numerical controller performs control for changing a tool mounted on a spindle to another tool stored in a tool magazine based on a machining program. The numerical controller analyzes a command by a block of the machining program, predicts a time required for machining by the analyzed command, and selects a tool changeable before a tool change command, during tool selection, based on the predicted time.

A numerical controller performs control for changing a tool mounted on a spindle to another tool stored in a tool magazine based on a machining program. The numerical controller analyzes a command by a block of the machining program, predicts a time required for machining by the analyzed command, and selects a tool changeable before a tool change command, during tool selection, based on the predicted time.

A system for changing and inserting or placing tools on a machine tool, including: a tool changer with a manipulator which is configured to remove a tool to be introduced from a tool magazine of the machine tool at a removal position and to transfer it to a work spindle of the machine tool at a tool change position in an automatic tool changing operation, and a tool diameter measuring apparatus, which is configured to determine a tool diameter or a tool radius of the tool to be introduced that has been removed from the tool magazine of the machine tool by the manipulator.

A tool replacement apparatus according to the present invention includes: a turning tool magazine capable of attaching or removing a tool to/from a spindle of a machine tool; a tool replacement control unit which controls operations of turning the tool magazine and attaching or removing a tool to/from a spindle; and a setting unit which sets a rotatable range of the tool magazine. The tool replacement control unit includes: a determining unit which determines whether or not a designated rotation angle in an instruction for turning the tool magazine is within the rotatable range set by the setting unit; and a unit which stops an operation of replacing a tool when the determining unit determines that a designated rotation angle is out of a rotatable range.

A tool replacement apparatus according to the present invention includes: a turning tool magazine capable of attaching or removing a tool to/from a spindle of a machine tool; a tool replacement control unit which controls operations of turning the tool magazine and attaching or removing a tool to/from a spindle; and a setting unit which sets a rotatable range of the tool magazine. The tool replacement control unit includes: a determining unit which determines whether or not a designated rotation angle in an instruction for turning the tool magazine is within the rotatable range set by the setting unit; and a unit which stops an operation of replacing a tool when the determining unit determines that a designated rotation angle is out of a rotatable range.

A method for identifying geometric errors in a machine tool includes the steps of: positioning a reference sphere so as to align its center with a centerline of a tool spindle; attaching a position measuring device having a gauge head to a rotation unit so as to direct the gauge head toward a rotation centerline of the rotation unit; acquiring displacement data relative to the center of the reference sphere by measuring positions of the reference sphere with the gauge head while rotating a rotation target (the swivel unit or the rotation unit) with the gauge head directed toward the center of the reference sphere, the displacement data being dependent on rotation angles of the rotation target; and identifying the geometric errors by least squares method using a mathematical expression having terms containing the geometric errors and representing displacement dependent on the rotation angles, and the displacement data.