Numerical controller for controlling tapping on basis of processing program

A numerical controller controlling tapping, in which a female screw is formed on an inner surface of a prepared hole formed in a workpiece in accordance with a fixed cycle, on the basis of a processing program,

• the numerical controller comprising a fixed cycle calculation unit that analyzes a fixed cycle command included in the processing program and generates a command data sequence including a plurality of command data on the basis of the analysis result,
• wherein the fixed cycle calculation unit includes:
• a surplus calculation unit that calculates a surplus cutting depth on the basis of an overall cutting depth applied to the workpiece by a tapping tool and a cutting depth applied to the workpiece by the tapping tool in each cut, the respective cutting depths being specified by the fixed cycle command;
• and
• a command data sequence adjustment unit that adjusts the order or the cutting depth of the command data included in the command data sequence on the basis of the surplus cutting depth so as to reduce a total feed movement amount by which the tapping tool moves in accordance with the command data sequence.