Numerical controller operating based on tabular data

A numerical controller which controls a position of a control axis in synchronization with a reference value by using tabular data for instructing a position of each control axis based on the reference value which is a time, a position of an axis, or a position of a spindle, the numerical controller comprising:

• non-transitory computer readable memory;
• one or more hardware processors coupled to the non-transitory memory and configured to read instructions from the non-transitory memory to cause the numerical controller to perform operations comprising:
• sequentially reading a command block from the tabular data and analyzing the command block so as to acquire and output a reference value and a coordinate value of a control point;
• making, if a command block includes a shift command for shifting a reference value, the shift of reference value valid in command blocks subsequent to the command block, and outputting the reference value of the control point which is shifted based on a shift amount specified by the shift command;
• and
• producing a movement amount for an axis to be controlled by the tabular data, based on the reference value outputted and the coordinate value of the control point outputted;
• wherein
• the reference value of the control point is outputted if the shift of a reference value is invalid.