The JIARUN series working fluids have excellent cleaning performance, so the products in the cut joint are less, and it is easy to threading wire in situ after broken wires, concrete steps are: the stepping motor remain in the "pull" state after broken wire, remove the less side of the waste wire and adjust the remaining molybdenum wire to appropriate location to continue to use. It is important to wipe the surface of the workpiece , drop the kerosene into the slit with a brush to wet the cut and drop a little bit of grease to the breakpoint. Choosing a straight molybdenum wire, cutting into a tip, and using a lighter flame to grill the molybdenum wire to hard, holding it in the upper part of molybdenum wire by a forceps, slowly threading wire down to 2-3mm every time along the slit, until through the workpiece. If the previous wire cannot be reused, new wire can be replaced. Threading the new wire at broken point depends on the degree of loss of the electrode wire, (note that the loss cannot be too great) the slit becomes smaller with the loss becomes greater, and the new wire cannot throughout the workpiece. However, it’s available to use a small piece of spun yarn paper to polish that part of the wire through the workpiece. The method can generally pass through the workpiece within 300mm thickness, so that the use efficiency of the machine tool is greatly improved.