A computer-implemented method provides setpoint values for a feed rate for adaptive feed control on numerically controlled machine tools. Upon machining a workpiece with a tool, receiving a real-time data with a current state of at least one controlled axis, determining actual values of at least one cutting force of the tool based on the real-time data, receiving a look-ahead data associated with a predicted state of the at least one controlled axis, simulating the machining of the workpiece based on the real-time data and the look-ahead data, generating simulated values of the at least one cutting force of the tool, determining at least one setpoint value for the feed rate of the at least one controlled axis based on the simulated values and the actual values of the at least one cutting force of the tool, and providing the at least one setpoint value.

The invention relates to a method for operating a machine tool which is configured for machining a workpiece blank using a tool, said method comprising the steps of: determining geometry data of the workpiece blank, determining geometry data of a tool used for machining the workpiece blank, dividing a tool path for machining the workpiece blank into a plurality of route increments, simulating a removal of material on the workpiece blank by means of the tool per route increment, and calculating engagement ratios between the workpiece blank and tool per route increment for determining engagement parameters, wherein an advancement and/or a rotational speed of the tool (2) are adjusted depending on the calculated engagement parameters.

Provided is a numerical control device that eliminates the need for rapid acceleration/deceleration of a cutting tool during boring and that is capable of minimizing vibration of a machine tool. This numerical control device comprises: a deep hole boring execution unit which performs deep hole boring by repeating a cutting operation for making a cut in a workpiece while rotating the cutting tool and a cutting halting operation for halting the cutting operation of the workpiece while rotating the cutting tool; and a chip-discharging time calculation unit which calculates a chip discharging time depending on the position of the cutting tool after each cut during the cutting operation. The deep hole boring execution unit performs the cutting halting operation during the chip-discharging time.

Provided is a numerical control device that appropriately promotes the discharge of chips and enables efficient drilling. This numerical control device comprises: a deep-hole drilling execution unit that performs deep hole drilling while repeating first cutting operation to cut a workpiece while rotating a cutting tool and second cutting operation to cut the workpiece at a slower speed than the first cutting operation while rotating the cutting tool; and a chip discharge time calculation unit that calculates the chip discharge time according to the position of the cutting tool after each cut in the first cutting operation. The deep-hole drilling execution unit performs the second cutting operation during the chip discharge time.