Controller for machine tool

A controller for a machine tool used for thread cutting of a work as a target of the thread cutting using multiple axes, comprising:

• a movement command generation unit that generates a movement command for the multiple axes;
• an oscillation command generation unit that generates an oscillation command for causing all three axes including at least a work rotary axis, a tool feed axis, and a radial direction motion axis to make oscillating motions involving synchronization between all the three axes including at least the work rotary axis, the tool feed axis, and the radial direction motion axis, the oscillation command being for causing a cutting tool for the thread cutting of the work to make motions of departing from the work while making cutting-out motions on the work and make cutting-in motions on the work intermittently;
• and
• an adder that adds the movement command and the oscillation command and outputs a total movement command resulting from the addition, wherein
• the total movement command is output to the machine tool,
• the oscillation command generation unit generates the oscillation command for making the intermittent motions at a predetermined cycle, and
• the predetermined cycle is a set optional temporal cycle.

A controller for a machine tool used for thread cutting of a work as a target of the thread cutting using multiple axes, comprising:

• a movement command generation unit that generates a movement command for the multiple axes;
• an oscillation command generation unit that generates an oscillation command for causing all three axes including at least a work rotary axis, a tool feed axis, and a radial direction motion axis to make oscillating motions involving synchronization between all the three axes including at least the work rotary axis, the tool feed axis, and the radial direction motion axis, the oscillation command being for causing a cutting tool for the thread cutting of the work to make motions of departing from the work while making cutting-out motions on the work and make cutting-in motions on the work intermittently;
• and
• an adder that adds the movement command and the oscillation command and outputs a total movement command resulting from the addition, wherein
• the total movement command is output to the machine tool,
• the oscillation command generation unit generates the oscillation command for making the intermittent motions at a predetermined cycle, and
• the predetermined cycle is defined by an external signal.