Patent ID: 8423171

Claim:
A method of processing a workpiece in a tool machine for processing said workpiece by relatively moving a tool with respect to said workpiece, said method comprising: a first step of continuously measuring a position of a tip point of a tool attached to a main axis; a second step of computing a displacement amount of said position of said tip point of said tool based on a result of a measurement in order; a third step of observing whether said displacement amount of said position of said tip point of said tool is within a range of an allowable accuracy previously determined for a certain time period in order to judge whether said position of said tip portion of said tool thermally displaced is converged or not; a fourth step of keeping an idling operation in the case that a time period that said displacement amount is within said range of said allowable accuracy is shorter than said certain time period previously determined so as to judge whether said position of said tip portion of said tool thermally displaced is converged or not and intermitting said idling operation in the case that said period that said displacement amount is within said range of said allowable accuracy is equal or longer than said certain time period previously determined; and a fifth step of starting processing said workpiece in the case that said idling operation is intermitted in said fourth step.