Numerical control device

Abstract

The present invention provides a numerical control device that can promote chip discharge appropriately and reduce machining time for hole drilling. The numerical control device comprises: a deep hole machining execution unit that performs deep hole drilling by repeating a cut operation and a return operation, the cut operation being an operation for cutting a workpiece while rotating a cutting tool and the return operation being an operation for retracting the cutting tool while rotating the cutting tool; and a chip discharge time calculation unit that calculates a chip discharge time according to the position of the cutting tool after each cut in the cut operation, wherein the deep hole machining execution unit performs the return operation during the chip discharge time.

Dependencies are inferred from the claim text.