Numerical control device and machine learning device

A numerical control device comprising:

• control computation circuitry to control a spindle that is a rotation axis of a machining target,
• a first drive axis to drive a first tool to perform vibration cutting machining on the machining target, and
• a second drive axis to drive a second tool to perform vibration cutting machining on the machining target,
• wherein:
• the control computation circuitry comprises:
• a machine learning device to learn a pass/fail prediction in which whether the vibration cutting machining passes or fails is predicted, and
• the machine learning device comprises:
• observation circuitry to observe a state variable including a vibration cutting condition for the first drive axis and the second drive axis for the vibration cutting machining;
• data acquisition circuitry to acquire pass/fail information indicating whether the vibration cutting machining has passed or failed;
• and
• learning circuitry to learn the pass/fail prediction according to a data set created based on a combination of the state variable and the pass/fail information.