Numerical controller

A numerical controller controlling a machine tool that performs skiving machining of cutting a rotationally symmetric surface of a rotating workpiece using a tool based on a machining program, the machining program being allowed to include a skiving machining command capable of specifying a movement path of a cutting point in the skiving machining, the numerical controller comprising:

• a command analysis unit that analyzes the machining program, and determines whether a block read from the machining program corresponds to the skiving machining command;
• a skiving machining command data calculation unit that calculates a path and a feed speed of the tool based on a path of the cutting point and a feed speed of the cutting point commanded by the skiving machining command when the command analysis unit determines that the block corresponds to the skiving machining command;
• and
• an interpolation unit that calculates interpolation data according to a progress rate of the block during actual machining based on the path of the tool calculated by the skiving machining command data calculation unit and a coordinate value during actual machining,
• wherein the machine tool is controlled based on the interpolation data calculated by the interpolation unit.