Patent ID: 6597968
Filing Date: 2003-07-22
Classification: G05B,Y02P

Abstract:
A numerical control apparatus of a machine tool comprising:an analyzing means for analyzing a machining program defining a machining process of a workpiece by the machine tool to extract therefrom, a cutting feed command program included in said machining program, and cutting/non-cutting information defining actual cutting by said cutting tool added to said cutting feed command program, a non-cutting feed permissible error setting means for setting a permissible error defining a permissible range of error from a path of movement of said cutting tool at the time of non-cutting feed, a cutting feed permissible error setting means for setting a permissible error at the time of cutting feed, a target feed speed calculating means for selecting one of the permissible errors set by the non-cutting feed permissible error setting means and cutting feed permissible error setting means in accordance with the content of said cutting/non-cutting information, calculating a permissible feed speed of said cutting tool based on the selected permissible error, and restricting the feed speed of the cutting tool to the permissible feed speed, and a distributing means for calculating control commands to be distributed to the control axes of the machine tool based on the feed speed.