Tool path correction device

A tool path correction device connected to a post processor or a numerical controller comprising a memory and a processor, wherein the processor:

• acquires tool path information that specifies a tool path along which a tool for machining a workpiece moves, by means of a plurality of command points through which the tool is to pass;
• acquires tool shape information that specifies a shape of the tool;
• acquires target shape information that specifies a target shape of the workpiece after being machined;
• adds an additional command point to a position, wherein a distance between a feature change point where a feature of the target shape changes and the position is equal to or smaller than a diameter of the tool, the additional command point serving as a new command point included in the plurality of command points;
• and
• rearranges, based on the additional command point as a reference position, the command points of the plurality of command points preceding and subsequent of the additional command point;
• wherein the memory stores a corrected tool path information in which the additional command point is added and the command point is rearranged;
• and
• wherein the processor outputs the corrected tool path information to the post processor or the numerical controller in a format as a CL data format or a machining program so that a machine tool is operated based on the corrected tool path information.