VT machining provides CNC Polishing Copper for customers who need accurate, repeatable Copper components. Because Copper is excellent electrical and thermal conductivity, we adapt the process to suit — controlling the variables that matter for this alloy.
CNC Polishing Capability for Copper
- Mirror finish capable
- Ra to 0.05 µm
- Cosmetic & sealing faces
- Multi-stage abrasives
Copper Material Data
| Density | 8.94 g/cm³ |
|---|---|
| Tensile strength | 220–350 MPa |
| Yield strength (0.2%) | 70–330 MPa |
| Hardness | 40–100 HV |
| Melting point | 1083 °C |
| Thermal conductivity | 391 W/m·K |
| Thermal expansion | 17.0 ×10⁻⁶/K |
| Electrical conductivity | 101% |
| Machinability (C36000 = 100%) | 20% |
| Grades we run | C10100 OFE, C10200 OF, C11000 ETP, C14500 tellurium copper |
Published typical values for C11000 ETP. Other grades in the family differ — the certificate supplied with your order carries the actual heat-lot figures.
It smears rather than cuts. Razor-sharp uncoated tooling and high rake; if the print allows it, C14500 tellurium copper machines four times better at ~90% IACS.
How CNC Polishing Copper Works
Abrasive media or tooling refine the Copper surface in controlled stages, removing the previous step's marks until the target roughness and edge condition are reached.
Every job begins from your CAD model or 2D drawing. Fixturing and tool paths are planned so the most critical dimensions are produced in the most rigid, repeatable setup. Critical dimensions are checked on the first part and monitored through the run.
Achievable Tolerances for CNC Polishing Copper
| Feature | Standard | Precision |
|---|---|---|
| Surface roughness | Ra 0.8 µm | Ra 0.05 µm |
| Edge break | 0.1–0.3 mm | 0.05 ±0.02 mm |
| Material removed | 0.02 mm | 0.005 mm |
| Bore roundness after honing | 0.005 mm | 0.002 mm |
| Cross-hatch angle | 45° ±10° | 45° ±5° |
| Cosmetic grade | uniform satin | mirror, no visible lines |
| Masking of datum faces | on request | standard |
Standard is what a normal quotation assumes. Precision is available on nominated features and is priced separately, because it needs extra setups, in-process gauging and CMM verification. Call out only the features that need it — blanket-tightening a drawing is the single most common reason a quote comes back expensive.
Design Tips for CNC Polishing Copper
A few design choices make a real difference to cost and quality. Telling us the target Ra, the cosmetic faces and any masking needs lets us finish Copper efficiently without over-processing. If you send your model early, we will return practical DFM feedback before you commit to production.
Secondary Operations & Finishing
We complete Copper components with the secondary steps your drawing calls for. We arrange heat treatment, surface treatment, marking and assembly as needed. Tell us the final spec and we will plan the full route so parts arrive ready to use.
CNC Polishing Tolerances & Surface Finish
Finishing brings Copper to a defined roughness target — from a uniform satin to Ra values as low as 0.05 µm — with controlled, repeatable edge breaks.
Final tolerances are governed by the material's behaviour, wall thickness and overall stiffness. We give honest DFM feedback if a callout would be costly or better achieved another way.
CNC Polishing Quality & Inspection
Consistent quality comes from disciplined process control. Critical dimensions on Copper parts are checked in-process and verified at final inspection using calibrated instruments and, where required, CMM measurement. Full documentation — dimensional reports, mill certs, FAIR — is available when your programme needs it.
Working with Copper
Copper offers a useful combination of properties: it is excellent electrical and thermal conductivity. Those characteristics shape how we approach finishing — from tool and parameter selection to work-holding and coolant.
If your application is sensitive to alloy condition, we agree the specification in writing and document it. Stock is sourced from reputable suppliers so what you order is what you receive.
Applications of CNC Polishing Copper
CNC Polishing of Copper supports parts across aerospace, medical, automotive, electronics, semiconductor, energy and general industrial sectors. We scale from one-off prototypes to ongoing production while holding the same quality.
How to Order CNC Polishing Copper
Ordering Copper parts is straightforward. Provide the drawing, material, quantity and any certification needs. Our engineers reply — in English — with feasibility, pricing and a realistic lead time, usually within one business day.
Parts We Have Run in Copper
Three representative CNC Polishing Copper jobs, with the callouts that actually drove the process plan. Yours will differ — these are here so you can judge whether your part is in our range before you spend time on an RFQ.
Deburred stamping
- Material
- Copper
- Size
- 40 × 25 × 1 mm
- Key callouts
- Edge break 0.05–0.15 mm, no sharp edges
- Batch
- 30,000 pcs
Vibratory finished in media sized to reach every internal cutout.
Cosmetic housing
- Material
- Copper
- Size
- 150 × 90 mm visible face
- Key callouts
- Uniform satin, no directional lines
- Batch
- 2,500 pcs
Grained in one direction with datum faces masked so they keep their tolerance.
Sealing face
- Material
- Copper
- Size
- Ø60 mm face
- Key callouts
- Ra 0.2 µm, flatness 0.005 mm
- Batch
- 1,000 pcs
Lapped after grinding; the seal spec is a roughness number, not a dimension.
Finishing Options for Copper
| Finish | Thickness / effect | Why it gets specified |
|---|---|---|
| Tin plate | 3–15 µm | Solderable, prevents oxidation |
| Silver plate | 2–10 µm | Lowest contact resistance for RF and power |
| Nickel underplate | 2–5 µm | Diffusion barrier under tin or gold |
| Gold flash | 0.05–1 µm | Contact surfaces, over nickel |
| Deburr / edge break | 0.05–0.3 mm | All parts unless the drawing says otherwise |
| Bead blast | Ra 1.6–3.2 µm | Uniform matt finish, hides tool marks |
| Laser marking | — | Part number, lot code, data matrix |
No drawing yet? Build one in the browser.
Set the metal, dimensions and features, watch the 3D model update as you type, then switch to the 2D sheet to add dimensions and tolerances. Download it or send it straight to us with your RFQ.
What We Need to Quote CNC Polishing Copper
- GeometrySTEP or IGES for the 3D model, plus a PDF drawing if you have tolerance callouts. A dimensioned sketch is enough to start.
- MaterialThe exact Copper grade and condition — temper, heat-treat state or hardness. If you are not sure, tell us the function and we will suggest one.
- QuantityPrototype count and the expected annual volume. Both change how the part is made and therefore what it costs.
- TolerancesWhich features are critical. Everything else runs to our standard tolerance, which is what keeps the price sensible.
- FinishSurface treatment, cosmetic requirements, and any faces that must be masked.
- DocumentsWhether you need a material certificate, dimensional report, FAIR or PPAP with the shipment.
Missing something from the list is not a problem — send what you have. We will come back with the specific questions rather than a generic form.
Other Metals for CNC Polishing
Other Processes for Copper
Send the drawing, the Copper grade and the quantity. You get pricing, lead time and any DFM notes back — usually within one business day.
Request a QuoteFrequently Asked Questions
Which industries use CNC Polishing Copper parts?
CNC Polishing Copper parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise Copper components are required.
Why is Copper a good choice for CNC Polishing?
Copper is excellent electrical and thermal conductivity, which makes it well suited to CNC Polishing. We tune the process to the alloy so the finished Copper finishing part meets your dimensional and functional requirements.
What tolerances can you hold for CNC Polishing Copper?
Achievable tolerances for Copper finishing depend on the alloy, geometry and feature size. We hold tight, repeatable tolerances appropriate to the feature and material. Exact figures are confirmed against your drawing callouts.
How clean are the edges produced by CNC Polishing on Copper?
Our deburring leaves Copper with a consistent, controlled edge break and burr-free surfaces.
What is CNC Polishing Copper and how is it done?
CNC Polishing Copper refers to cNC polishing refines surfaces to a smooth, reflective finish for cosmetic and functional needs. Applied to Copper — excellent electrical and thermal conductivity — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
What is the typical lead time and minimum order for CNC Polishing Copper?
CNC Polishing prototypes for Copper can be produced quickly and scaled to series production. Send your drawing and quantity and we will advise lead time and any minimum order.