ADDITIONAL PROCESSING DEVICE IN MACHINE TOOL

PURPOSE:To enable the prevention of the occurrence of an improper workpiece by providing an additional process setup memory for setting up an additional processing program for the concerned processing part on the basis of an additional processing instruction discriminated on a tolerance discrimination means. CONSTITUTION:Discrimination is made as to whether an outer diameter with an inner diameter of +NG happens to have an inner diameter of -NG. If the inner diameter is -NG, judgement is made to stop a subsequent process for measuring NG and a stop flag is set up, thereby notifying the forbid of transit to the subsequent process. When there is an NG area for additional processing, the concerned measuring position number and tool number are outputted from a measuring function processing program, and temporarily stored in a register 21. And according to NC processing data stored in an additional work setup memory 22, additional work processing is made and judgement is again made about the continuity of the subsequent process. As aforementioned, the sizes of a workpiece are measured and judgement is made as to whether the measured value is within a tolerance, thereby making a process for a good workpiece through an additional work, regardless of the measured value exceeding the tolerance.