If your CNC shop is struggling with C10100, you are not alone. Because C10100 Oxygen-Free Electronic copper is 99.99% pure, it lacks the brittle oxide inclusions or alloying agents (like Lead or Tellurium) that help break chips during metal removal. The result? Long, stringy, "sticky" chips that clog spindles and tear the surface finish of your precision parts.
Mastering the machining of OFE Grade 1 copper requires a shift away from standard brass or ETP copper settings. To achieve the mirror-like finish required for vacuum electronics and high-power conductors, you must manage tool heat and chip evacuation with extreme precision.
Why does C10100 cause Built-Up Edge (BUE) on your tools?
C10100 is highly ductile and has a high coefficient of friction. During the cutting process, the copper literally "welds" itself to the cutting edge of the tool due to the heat and pressure. This is known as a Built-Up Edge (BUE). Once BUE occurs, the tool loses its sharpness, leading to dimensional errors and a rough "torn" surface on your C10100 Plate, Sheet.
To prevent BUE, we recommend:
Polished Carbide Tooling: Use inserts with a high positive rake angle and a mirror-polished face.
DLC Coatings: Diamond-Like Carbon (DLC) coatings significantly reduce the friction between the chip and the tool, preventing the copper from sticking.
High-Pressure Coolant: Flood cooling is essential, but through-spindle coolant is better for flushing chips out of the cutting zone instantly.
Ask GNEE Machinists: How to Fix Poor Surface Finish on C10100 Parts
Dealing with the "Bird Nest": Chip Control in C10100 Drilling
Drilling deep holes in C10100 is perhaps the most difficult task in the shop. The chips do not break naturally; they form long ribbons that wrap around the drill bit. This "bird-nesting" can cause the tool to snap or ruin the internal bore of a Custom CNC Machined Parts.
Peck Drilling is Mandatory: Use a frequent peck cycle to break the chips manually. For depths beyond 3x diameter, decrease the peck increment as you go deeper.
Parabolic Flute Drills: These drills have wider flutes that facilitate easier chip evacuation for gummy materials like 99.99% pure copper.
Avoid Over-Feeding: While you want to stay in the cut to prevent work hardening, an aggressive feed will only exacerbate the chip-wrapping problem.
Troubleshooting C10100 Machining Issues
| Problem | Likely Cause | Recommended Solution |
| Orange Peel Surface | Tool rubbing instead of cutting | Increase feed rate or use sharper tool |
| Excessive Burring | Material is too soft/sticky | Use cold-worked (Half-Hard) temper |
| Dimensional Drift | Thermal expansion during cut | Increase coolant flow / Use multiple passes |
| "Tearing" Marks | Built-Up Edge (BUE) | Use DLC coated tools / Polished rake |
If you are seeing "orange peel" textures during a milling operation, the material might be work-hardening under the tool. As we discussed in our guide on C10100 bending and work hardening, once C10100 hardens, it becomes more difficult to achieve a clean finish. For optimized speeds and feeds, refer back to our original C10100 machining speeds and feeds guide.
Machining C10100 successfully is a balance of high-speed chip evacuation and aggressive cooling. At GNEE METAL, we recommend sourcing material in a Half-Hard (H02) temper if you intend to do extensive CNC milling, as the increased hardness helps the chips break more cleanly than fully annealed copper. Whether you are milling heat sinks or drilling conductive pipes, GNEE METAL provides the certified Grade 1 material and the technical expertise needed to turn C10100 into a flawless finished component.
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GNEE METAL Product Range
| Product Type | Shapes Available | Common Grades | Diameter/Thickness Range | Length/Width Range | Applications |
|---|---|---|---|---|---|
| Copper Tubes | Round, Square, Rectangular, Coiled | C10100, C10200, C11000, C12200, C12000 | OD: 0.5mm - 300mm Wall: 0.1mm - 20mm | Up to 6000mm or custom | HVAC, Plumbing, Heat Exchangers, Refrigeration, Hydraulic Lines |
| Copper Plates & Sheets | Flat Sheets, Perforated, Embossed, Tread Plate | C10100, C11000, C12200, C23000, C26000 | Thickness: 0.1mm - 200mm | Width: Up to 2500mm Length: Up to 6000mm | Electrical Busbars, Roofing, Cladding, Gaskets, Transformers |
| Copper Bars & Rods | Round Bar, Square Bar, Hexagonal Bar, Flat Bar | C10100, C11000, C14500, C17200, C18200 | Diameter: 1mm - 300mm | Length: 1000mm - 4000mm | Machined Components, Electrical Contacts, Busbars, Fasteners |
| Copper Wires | Round Wire, Flat Wire, Square Wire, Stranded, Braided | C11000, C11600, C17200, C17510 | Diameter: 0.05mm - 12mm | Coil weights: 1kg - 500kg | Electrical Wiring, Cables, Springs, Mesh, Welding Wire |
| Copper Strips & Coils | Thin Strip, Foil, Slit Coil, Profile Strip | C11000, C12200, C19400, C26000, C26800 | Thickness: 0.03mm - 5mm | Width: 2mm - 1000mm Coil ID: 300mm - 600mm | Transformers, Radiators, Shielding, Terminals, Connectors |
About Our Factory
We operate a full range of production lines including extrusion presses, cold drawing benches, high-speed rolling mills, slitting lines, and precision CNC machining centers, enabling us to produce copper tubes, plates, bars, wires, and strips entirely in-house. For quality assurance, we maintain a dedicated inspection laboratory equipped with spectral analyzers, universal testing machines, hardness testers, surface roughness testers, and optical measuring instruments. Every batch is tested for chemical composition, mechanical properties, and dimensional accuracy before shipment. Our production capacity reaches 500+ tons per month, and we hold ISO 9001:2015 certification with full traceability from raw material to finished product. Whether you need standard mill stock or custom-processed components, we deliver precision copper products with short lead times and complete material certification.
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