Provided is a program of calculating a tool path that processes a workpiece having a complicated shape with use of an apparatus enabling multiaxial control in a program including a robot or the like with simple information input. A path calculation program for calculating a tool path for processing a curved processed part formed by a hole provided in a curved-surface-shaped workpiece functions as a workpiece shape information inputter configured to input workpiece shape information about a shape of the workpiece and a shape of the curve, a tool shape information inputter configured to input tool shape information about a shape of the tool, and a tool position calculator configured to calculate a tool position enabling a specified point on the curve to be processed by the tool based on the input workpiece shape information and tool shape information.

A numerical control device that controls electric discharge machining includes: a program path creation unit that analyzes a machining program consisting of a plurality of machining processes including rough machining, semi-finishing machining, and final finishing machining and creates a program path for each of the machining processes; a machining condition storage unit that stores a plurality of machining conditions suited to the machining processes and at least one machining condition suited to an unmachined part; and a machining condition change unit that, when an unmachined part occurs in a prior machining process, changes a machining condition for the current machining processes to a machining condition adapted to the unmachined part.

Provided is a program of calculating a tool path that processes a workpiece having a complicated shape with use of an apparatus enabling multiaxial control in a program including a robot or the like with simple information input. A path calculation program for calculating a tool path for processing a curved processed part formed by a hole provided in a curved-surface-shaped workpiece functions as a workpiece shape information inputter configured to input workpiece shape information about a shape of the workpiece and a shape of the curve, a tool shape information inputter configured to input tool shape information about a shape of the tool, and a tool position calculator configured to calculate a tool position enabling a specified point on the curve to be processed by the tool based on the input workpiece shape information and tool shape information.