Numerical controller

A numerical controller for controlling a machine tool including a spindle axis based on a machining program to relatively move the spindle axis with respect to a workpiece, thereby performing cutting in a different direction from a direction of the spindle axis, the numerical controller comprising:

• a tool data storage unit for storing tool data related to a tool attached to the spindle axis;
• a command analyzer for reading and analyzing a command block from the machining program, and generating movement command data for relatively moving the spindle axis with respect to the workpiece and spindle axis rotation command data for rotating the spindle axis;
• and
• a cutting speed controller for calculating a recommended cutting feed rate of the spindle axis based on the tool data of the tool, and clamping a cutting feed rate of the spindle axis included in the movement command data at the recommended cutting feed rate when the cutting feed rate of the spindle axis is larger than the recommended cutting feed rate.