| 摘要 |
PURPOSE:To leave a connection part of machined articles between external male and internal female sides and prevent a drop of the article in the external male side further prevent damage of a machined surface at cutting of said connection part, when a material is cut to a shape of closed contour. CONSTITUTION:A machining start hole PO is provided to one side 1 not used as the product of materials between external male and internal female sides, and a wire is moved from the hole PO to a machining start point A of a closed contour line. Successively, machining is performed along the closed contour line to leave an unmachined distance DELTAS at an end point B, and the wire is moved curving to a machining end point C and then the machining is stopped. In consequence, the distance DELTAS can be correctly held to prevent a drop of the external male side due to an excessive cut, further a sag or the like of the wire at restarting of machining in a connection part is not influenced to a machined surface. |
