Numerical controller

A numerical controller for machining a workpiece by controlling a machine including at least one axis based on a machining program, the numerical controller comprising:

• a processor configured to:
• predict reference machining time corresponding to a machining time not considering a delay time of servo control and machine motion based on the machining program;
• extract combinations of program commands included in the machining program by analyzing the machining program, each of the combinations including commands from at least two different blocks of the machining program;
• store, in a memory device, information related to an actual delay time of servo control and machine motion measured in actual machining by the machine for of the combinations;
• calculate a correction time for correction of the reference machining time based on each of the combinations and information related to an actual delay time of servo control and machine motion for each of the combinations;
• calculate a predicted machining time obtained by correcting the reference machining time using the correction time;
• and control at least one of a servo motor or a spindle motor of the machine based on the predicted machining time;
• and
• calculate the correction time by estimating a delay time of servo control and machine motion with regard to each combination of the program commands extracted based on the information related to the actual delay time of servo control and machine motion for each combination of the program command types stored in the memory device and integrate each estimated delay time of servo control and machine motion.