Control device for machine tool

A control device for a machine tool that uses a cutting tool to perform thread cutting with respect to a workpiece, the control device comprising:

• a cutting position acquisition unit configured to acquire a cutting position for the thread cutting;
• a margin acquisition unit configured to acquire a margin that is set such that the cutting tool goes beyond the cutting position in thread cutting that does not have oscillation;
• an oscillation amplitude information acquisition unit configured to acquire oscillation amplitude information that indicates an oscillation amplitude of the thread cutting that has oscillation;
• and
• a thread cutting command generation unit configured to generate a thread cutting command based on the cutting position, the margin, and the oscillation amplitude information, wherein
• the thread cutting command generation unit has
• a no-oscillation cutting position determination unit configured to, based on the cutting position and the margin, set a no-oscillation cutting position that is for a time of the thread cutting that does not have oscillation, and
• generates the thread cutting command that is for executing thread cutting based on the cutting position acquired based on the cutting position acquisition unit in the thread cutting that has oscillation, and for executing the thread cutting based on the no-oscillation cutting position set by the no-oscillation cutting position determination unit in the thread cutting that does not have oscillation.