Abstract

A laser machining resuming method in which the laser machining can be securely resumed without leaving an un-machined portion when machining is interrupted while laser machining is being carried out. When laser machining is performed a distance of L(0) from a machining point (P1) and abnormal machining is sensed at a machining point (P3), a CNC starts a retry processing in response to an abnormal machining sensing signal. That is, first, the laser machining is stopped and the position of the machining point (P3) at the time is stored. Next, the machining head is retracted a distance h(0) in a Z-axis direction and moved backward a distance L(2) along a machining path L having been executed until that time. When the backward movement is completed at a point (P6), a gap between a nozzle and a workpiece is controlled, and the laser machining is resumed on the completion of the approach. When the CNC receives an abnormal machining sensing signal again while the machining head is being moved forward from a machining point (P7) to a machining point (P4), the retry processing is carried out again. When the number of repetition of the retry processing exceeds the predetermined number of times n(0), e.g., three times, the machining block having been executed is stopped and skipped to execute machining of the next block.