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Evaluating the using effect of EDM super wire cut filters mainly by process indicators. EDM super wire cut filters process indicators include precision machining, surface roughness, cutting speed and so on. In addition, the discharge gap, the electrode wire wear and the machined surface layer change is also an important indicator of using effects of EDM super wire cut filters. The surface roughness which is the surface roughness degree of the parts, which is an important indicator to measure the CNC EDM super wire cut filters quality. KENOS in accordance with national standards use three indicators to evaluate the surface roughness: the outline arithmetic mean deviation Ra, the concept of micro-roughness and contour ten point height Rz maximum height Ryo! After CNC wire cutting, the dirt of the work-piece surface and the residues of electrode wire will affect the EDM super wire cut filters walking again, so we have to clean EDM super wire cut filters regularly. We should know the methods of EDM super wire cut filters maintenance well and in strict accordance with the EDM super wire cut filters instruction to operate the filters in order to achieve longer life of EDM super wire cut filters and make higher quality of the work-pieces.