Machine tool control device and machine tool display device

A display device for a machine tool that performs thread cutting with a cutting tool that oscillates relative to a workpiece, the display device comprising:

• a condition input unit configured to receive, as a precondition, an input of one or two pieces of information from among three pieces of information including an oscillation phase difference between an n-th thread cutting pass and a thread cutting pass subsequent to the n-th thread cutting pass, information regarding a cut amount in a radial direction of the workpiece, and information regarding an oscillation amplitude in the radial direction of the workpiece;
• an air cutting amount input unit configured to receive an input of a designated air cutting amount that indicates a degree of air cutting in an oscillation direction;
• an information calculation unit configured to calculate, based on the precondition, the information among the three pieces of information that is not received by the condition input unit such that an air cutting amount based on an interval between the n-th thread cutting pass and the thread cutting pass subsequent to the n-th thread cutting pass becomes equal to the designated air cutting amount;
• and
• a display unit configured to display the information calculated by the information calculation unit.