NUMERICAL CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide a numerical control device having a feeding function for providing moving of a specified moving axis (reference axis) with speed commanded by a program without being affected by moving of other moving axes. SOLUTION: This numerical control device has an NC command part for preparing data of a moving block by analyzing an NC program and a position command part for calculating a command position of the moving axis for every prescribed sample time based on desired position and desired speed included in the data of the moving block. When a simultaneous linear interpolation command exists for the plurality of moving axes in the data of the moving block inputted from the NC command part and the moving axis (mentioned as 'reference axis') to be controlled so that synthesis speed may be the same as the desired speed exists in the plurality of moving axes, the command position of each of a plurality of moving axes is calculated for every sample time so as to perform a linear interpolation so that synthesis speed of the reference axis may be the same as the desired speed in the position command part.