The grinding machine processing carries high-quality technical experience in the industry, and the extemal dimensional accuracy and flatness of the processed mold products can be ontrolled within 0.001mm; The perpendicularity (1-50mm) reaches<0.002mm, the aocuracy of groove and slope angles is<0.002mm, and the accuracy of arc R angles is<0.005mm; The root clearance angle of grooves and steps is less than Ro.03mm, with a minimum thin-waed grinding wheel trimming width of 0.08mm and a height of 1.5mm. It will be widely used in molds for narrow spacing electronic connectors (FPC, BTB).