A tool path is generated with procedures that include: one of the processing points (Pi) on a multiple rows of tool paths (PA) obtained by connecting multiple prescribed processing points sequentially with straight lines is set as a revision processing point (Pt), points on the multiple rows of tool paths are set as distance calculation points (Pu), and the distance (L) from the revision processing point (Pt) to each of the distance calculation points (Pu) is calculated; the distance calculation points (Pu′) for which the distance (L) is within a prescribed value (ΔL) are extracted; the mean values of the position data for the distance calculation points (Pu′) and the position data for the revision processing point (Pt) are calculated; and the position data is revised by means of the mean values, and a new tool path (PA′) is created.

A display control device according to an embodiment controls display of a state of a machine tool that includes (i) an attachment portion to which a tool is attachable, (ii) a numerical control unit for controlling (a) movement of the attachment portion and (b) a rotating speed of the tool in accordance with a machining program and (iii) a vibration detection unit for detecting vibration of the tool. This display control device includes a display control unit for controlling display of time-series data indicating (i) a change in a vibration level detected by the vibration detection unit and (ii) a change in the rotating speed of the tool. Upon receiving an instruction to change the rotating speed, the display control unit controls the display so that a marker indicating the change instruction is superimposed on the time-series data.

A CPU unit of a PLC executes a motion control and a sequence control. The CPU unit stores a CAM table and a control program for performing the motion control using the CAM table. When a microprocessor receives a command for altering one of a plurality of phases and/or a displacement associated with the phase, the microprocessor alters the phase and/or the displacement in the CAM table to a value that is on the basis of the command. When the microprocessor performs the alteration, the microprocessor executes a control program using a post-alteration CAM table, and outputs the execution results to an apparatus to be controlled.