English: Copper Needs a Sharp Edge and Controlled Chip Flow
Copper electrode CNC milling is different from steel machining because copper is ductile and can stick to the cutting edge. Built-up edge can damage fine electrode details, reduce surface finish and change dimensional accuracy. A sharp polished carbide end mill, proper feed per tooth and clean chip evacuation help keep copper cutting cleanly.
For EDM electrodes, surface quality matters because the machined electrode shape is transferred into the final mold cavity. Light finishing passes, stable toolpaths and low runout improve edge definition. Coolant or air strategy should be selected to remove chips without causing thermal or contamination problems in the process.
Practical process guidance
Avoid dull tools and rubbing conditions. If copper starts smearing instead of forming clean chips, increase effective cutting action, review flute polish and reduce chip recutting. Consistent tool pressure is essential for fine electrode features.
