Aerospace has always demanded precision, but the materials making up modern aircraft are raising the bar again. Lightweight composites, specialised plastics, titanium, and nickel based superalloys all bring different machining forces and temperatures, and all require tighter dimensional accuracy.
So the question becomes less about whether machining is difficult, and more about whether tooling materials are keeping pace.
The materials are evolving, fast
The latest generation of aircraft are built primarily from CFRP composites to reduce weight and improve fuel economy. Those benefits are significant, but they introduce new manufacturing realities. CFRP requires clean cutting of tough fibres, and modern aircraft design also increases the importance of machining acrylic windows, where controlling operating temperature becomes critical.
Why tool material choice is now a performance lever
Aerospace machining is not one problem. It is many problems happening at once. Aluminium, magnesium, titanium, steel and their alloys, plus composites and stack machining, all generate different forces and thermal conditions. In that context, tool materials are not just a cost line, they become a lever for stability, productivity, and part quality.
Supermaterials as a practical response
The document outlines a portfolio that includes Polycrystalline Diamond (PCD), Polycrystalline Cubic Boron Nitride (PCBN), single crystal diamond, and tungsten carbide. A key point is not simply the availability of materials, but the ability to engineer the characteristics of diamond, balancing wear resistance with toughness and thermal stability for optimised performance.
Proven applications across the aircraft
The content highlights multiple application areas:
- Landing gear and braking systemsTitanium is becoming more prevalent in landing gear, and graphite’s abrasivity makes it a natural choice for braking friction materials. In braking system components, PCD tools are described as routinely outperforming coated and uncoated tungsten carbide.
- Airframe parts and MMCs Metal Matrix Composites can be difficult to machine due to abrasive silicon carbide fibres or particles. Specific PCD grades and CVD single crystal diamond are positioned as suitable for milling and turning these materials due to wear resistance and edge toughness.
- Jet engine components and grinding operationsNickel based superalloys are common in shafts and combustion casings. For turning, PCBN is presented with typical tool life increases of 30% to 50%, at 300% cutting speed compared to conventional tool materials. In grinding, ABN900 is described as becoming a material of choice in certain applications due to extended tool life compared with competitor materials.
Conclusion
Aerospace manufacturing is a moving target because aircraft materials keep changing. The tool material conversation is no longer secondary. It is how toolmakers keep pace with new composites, harder to machine alloys, and the growing demand for consistent, high accuracy production.