CNC Machining Copper

Specific characteristics and process routes in CNC copper machining

Copper is a distinctive structural material with outstanding electrical and thermal conductivity, but it brings a number of technological challenges. CNC machining of copper requires precise cutting conditions, as it is an exceptionally tough metal. Incorrect tool geometry produces long chips that wrap around the spindle. We therefore use special coated carbide tools with polished flutes for smooth material evacuation.

Intensive cooling is essential to achieve surface roughness below Ra 0.8 µm and tolerances of ±0.01 mm. High-pressure emulsions prevent built-up edge forming on the cutting edge and minimise thermal distortion. Precision machining of metals with high thermal conductivity requires temperature fluctuations to be compensated directly in the control system.

In clamping we focus on minimising forces so that thin-walled parts are not plastically deformed. We use vacuum clamping systems and custom-milled soft jaws that distribute pressure. This approach guarantees dimensional stability even on complex models.

Grades processed and international standards

We work with a broad spectrum of copper alloys specified to EN and ISO standards. Each alloy has different machinability and is intended for specific applications in electrical engineering or the automotive industry.

Selecting the right blank is key to the final mechanical properties of the part. Before production starts we therefore consult design engineers on the suitability of a specific material given the required electrical conductivity and strength.

• Cu-ETP (CW004A / 2.0060): Electrolytic tough pitch copper, ideal for busbars and heat sinks. It offers electrical conductivity of at least 58 MS/m.
• Cu-OF (CW008A / 2.0040): High-purity oxygen-free copper for vacuum technology and cryogenic applications, free from hydrogen embrittlement.
• CuTeP (CW118C / 2.1293): Tellurium copper, which fundamentally improves chip breaking. It is the preferred material for automatic CNC turning.
• CuBe2 (CW101C / 2.1247): Beryllium copper offering extreme tensile strength and excellent non-sparking properties, suitable for spring contacts.

Technological capacity for milling and turning

The machine park at Metal One is designed for comprehensive metal cutting. For CNC milling of copper blocks we use five-axis machining centres, which allow complex cooling labyrinths to be produced in a single setup. This eliminates mating errors and shortens production time.

For rotating parts such as connectors and pins we use sliding-headstock CNC turning. These machines are equipped with driven tools, allowing complete machining of the part including off-axis holes. With copper it is critical to hold precise diameters for press fits within IT5 to IT6 tolerances.

Thorough final inspection is part of the process. We use 3D coordinate measuring machines and optical profilometers to verify that every part conforms to the CAD model. Parts manufactured to drawing are backed by exact measurement reports.

Logistics and deliveries across Europe

Our production facility is based in Ladce, Slovakia, with direct motorway access. This lets us respond flexibly to just-in-time delivery requirements for our partners' assembly lines.

We ship precisely machined copper components throughout the European Union. Our location in the heart of Central Europe reduces logistics costs and shortens lead times for customers in the electrical engineering industry.

We cover the complete chain, from purchasing certified material through to final surface treatment such as electroplated tin. This approach reduces the burden on buyers and guarantees traceability of production batches.