CNC Milling
CNC Milling is a machining process where a rotating cutter removes material from a work piece by way of multiple cutting edges. Movement is by feeding the work piece, the tool, or both.
Key variables include cutting speed, feed per tooth, depth of cut (radial & axial), cutter geometry, tool material, and work holding. Rigidity and vibration control are critical. The goal is to achieve desired shape, tolerance, surface finish, and structural integrity, while minimising tool wear and machining time.
CNC Milling Forging Die
CNC Milling with Aerospace Grades & Inconel
Aerospace components demand tight tolerances, high fatigue and temperature resistance, often with lightweight but strong materials. Inconel is commonly used because it retains strength at high temperature, resists corrosion and oxidation. Inconel grades we work with include 718, 625, X-750, plus others. Each has different hardness, thermal properties, weld ability, etc.
When CNC milling Inconel or aerospace grade materials, we need:
- Tools with high hardness, good coatings, capable of withstanding heat;
- Good cooling / lubrication;
- Chip evacuation;
- Strong fixturing / low tool overhang;
- Careful control of parameters to avoid work-hardening, chatter, overheating.
Capabilities / CNC Milling & Machining Centres
Download our recent capabilities equipment summary table
Lifting & Inspection
- Overhead Cranes: 2 × 10-ton, 1 × 5-ton
- Inspection Equipment: QCT Quantum 4-665 (Manual)
- Table: X 600 mm × Y 600 mm × Z 500 mm
- Software: QCT Inspect 3D-PRO
CNC Milling FAQs
Why is Inconel harder to mill than steel or aluminium?
Because it’s very tough, quickly work-hardens, and doesn’t dissipate heat well.
What tooling do we use for Inconel?
Carbide tools with heat-resistant coatings (e.g. TiAlN etc.), good geometry, and preferably multi-fluted cutters.
How do we control tool life / avoid damage?
Use good cooling/lubrication, avoid too shallow cuts that rub rather than cut, use climb milling when possible, ensure machine and fixturing rigidity.
What tolerances / finishes are possible?
Very tight, often required in aerospace, with careful finishing passes, inspection and quality control.
What file formats do you accept?
We typically accept STEP, IGES, and SolidWorks files. Detailed drawings with tolerances, finishes, and material specifications help ensure accurate quoting and manufacturing.
What surface finishes are available?
Standard finishes include as-machined, bead blasted, and polished surfaces. Additional finishing such as anodising, plating, or coating can be arranged if required.
What is CNC milling and what parts is it best suited for?
CNC milling is a machining process where rotating cutting tools remove material from a solid block to create precise shapes and features. It is ideal for components requiring flat surfaces, slots, pockets, complex contours, and tight tolerances. Milling is commonly used for aerospace, automotive, medical, and industrial parts where accuracy and repeatability are critical.
What materials can be CNC milled?
CNC milling is suitable for a wide range of materials including aluminium, stainless steel, mild steel, tool steel, brass, copper, plastics, and engineering polymers. Material selection depends on strength, weight, corrosion resistance, and application requirements.
What tolerances can you achieve with CNC milling?
Tolerances depend on material, geometry, and part size, but milling typically achieves tolerances of ±0.01 mm or better. For critical features, tighter tolerances can be achieved with controlled processes and inspection.
Can you produce both prototypes and production volumes?
Yes. CNC milling is suitable for one-off prototypes, low-volume batches, and repeat production runs. Programs can be stored and reused to ensure consistency across future orders.
How complex can milled parts be?
Modern milling machines can produce highly complex components, including 3D contours and multi-face features. 4-axis machining allows multiple operations in a single setup, improving accuracy and efficiency.
How long does CNC milling take?
Lead times vary depending on complexity, material availability, and quantity. Simple parts may be produced within days, while complex or high-volume jobs may require longer scheduling.
