NUMERICAL CONTROL DEVICE

Provided is a numerical control device with which the tip position of a tool can be positioned with high precision in a three-dimensional space. This numerical control device (1) is equipped with a position correction unit (5) and an error data storage unit (10). The error data storage unit (10) stores error data for the X-, Y-, and Z-axes, that is, data pertaining to the angular error (Eax, Eay,Eaz) around the X-axis, the angular error (Ebx, Eby, Ebz) around the Y-axis, and the angular error (Ecx, Ecy, Ecz) around the Z-axis. The position correction unit (5) calculates a revision amount (Mx,My, Mz) in accordance with the tool length, on the basis of a command position (Ix, Iy, Iz), the error data, and tool length data for the tool being used, revises a correction amount (Cx, Cy, Cz) forthe command position (Ix, Iy, Iz), and uses the revised correction amount to correct the command position (Ix, Iy, Iz). 本发明提供种能够将工具的前端位置在三维空间内高精度地定位的数值控制装置。数值控制装置(1)具备位置校正部(5)及误差数据存储部(10)。误差数据存储部(10)存储与绕X、Y、Z各轴中的X轴的角度误差(Eax、Ea