| 摘要 |
A numerical controller has a threading cycle function that performs threading on a workpiece by repeating an operation in which a tool is positioned at a cutting start position based on a machining program designating a thread shape and is relatively moved in the workpiece axis direction with respect to the workpiece. By a threading instruction of the machining program, a cutting start position for each cycle is calculated so that the workpiece is sequentially cut in a direction opposite to the movement direction of the tool with respect to the workpiece. The tool is positioned at the cutting start position calculated for each cycle and the threading is performed on the workpiece. |
