Numerical controller

A numerical controller that controls a machine which performs turning on a workpiece based on a program, the numerical controller comprising:

• a motor controller for controlling movement of a tool of the machine and rotation of spindle connected to the workpiece;
• a processor configured to:
• designate a machining condition of turning;
• designate a machining condition of nicking;
• generate an instruction sequence of a turning cycle operation based on the turning machining condition to continuously cut the workpiece to a predetermined cut depth along a predetermined cut length in an axial direction;
• generate an instruction sequence of a nicking cycle operation based on the turning machining condition and the nicking machining condition to cut a nick to a predetermined nick depth into the workpiece at a predetermined nick location along the axial direction;
• and
• instruct the motor controller to execute the instruction sequence of the nicking cycle operation by rotating the spindle and moving the tool in s first movement pattern prior to instructing the motor controller to execute the instruction sequence the turning cycle operation by rotating the spindle and moving the tool in a second movement pattern.