A numerical value controller includes a storage unit that stores a machining program involving executing a plurality of canned cycles each including a first operation for positioning a drilling position of a workpiece relative to a tool, a second operation for moving the tool from a return point to a hole bottom point, and a third operation for moving the tool from the hole bottom point to the return point; a control unit that controls movement between the tool and the workpiece based on the machining program and that moves the tool along curved paths by starting the second operation before the first operation ends and starting the first operation in a subsequent canned cycle before the third operation ends; a distance calculating unit that calculates a retraction distance; and a curvature calculating unit that reads a positioning command for the drilling position for the subsequent canned cycle.

A numerical controller has a tool retraction function for retracting a tool so as not to damage the machined surface of a workpiece when machining of the workpiece by a machine tool is interrupted. The numerical controller identifies a machining method for the machining to be interrupted when a command to interrupt the machining is detected, determines the direction of the retraction of the tool, based on the identified machining method and the feed direction and the rotation direction of a spindle in the machining to be interrupted, and generates a movement path of the tool in the determined retraction direction.

A numerical controller has a tool retraction function for retracting a tool so as not to damage the machined surface of a workpiece when machining of the workpiece by a machine tool is interrupted. The numerical controller identifies a machining method for the machining to be interrupted when a command to interrupt the machining is detected, determines the direction of the retraction of the tool, based on the identified machining method and the feed direction and the rotation direction of a spindle in the machining to be interrupted, and generates a movement path of the tool in the determined retraction direction.

The present invention relates to a method for machining a blank (10) by means of a tool (12) for producing a finished part, wherein the tool (12) is moved during the machining on a guide path (14) comprising at least three successive path segments (16, 18, 20; 16-1, 18-1, 20-1; 16-2, 18-2, 20-2; 18) in the form of two machining segments (16, 20; 16-1, 20-1; 16-2, 20-2) and one connecting segment (18; 18-1; 18-2; 18), which connects the two machining segments (16, 20; 16-1, 20-1; 16-2, 20-2) to one another, and wherein the connecting segment (18; 18-1; 18-2; 18) of the path segments (16, 18, 20; 16-1, 18-1, 20-1; 16-2, 18-2, 20-2; 18), which connecting segment connects the two machining segments (16, 20; 16-1, 20-1; 16-2, 20-2), is determined in terms of its shape by the forward feed (F1) of the tool (12) at the end (24) of the first machining segment (16) and by the forward feed (F2) of the tool (12) at the start (30) of the second machining segment (20).

A numerical value controller includes a storage unit that stores a machining program involving executing a plurality of canned cycles each including a first operation for positioning a drilling position of a workpiece relative to a tool, a second operation for moving the tool from a return point to a hole bottom point, and a third operation for moving the tool from the hole bottom point to the return point; a control unit that controls movement between the tool and the workpiece based on the machining program and that moves the tool along curved paths by starting the second operation before the first operation ends and starting the first operation in a subsequent canned cycle before the third operation ends; a distance calculating unit that calculates a retraction distance; and a curvature calculating unit that reads a positioning command for the drilling position for the subsequent canned cycle.