CNC precision machining of aluminum alloys like 6061, 7075, and 5052 is fundamental in manufacturing due to aluminum’s lightweight, corrosion-resistant, and versatile nature.
- 6061: Excellent corrosion resistance and weldability, ideal for structural and aerospace components.
- 7075: High strength-to-weight ratio, perfect for aerospace, automotive, and high-performance parts.
- 5052: Superior formability and corrosion resistance, widely used in marine and electronic applications.
These alloys can be precisely machined into aluminum CNC machining parts with tight tolerances, smooth finishes, and reliable performance, making them indispensable in modern engineering.
Aluminum Main Features
Aluminum is a metallic material that typically appears silver or matte gray, depending on its surface finish. Despite its relatively soft texture, it offers remarkable durability and strength. One of the key reasons aluminum is widely used across industries is its lightweight, ductile, and malleable nature. It’s also non-magnetic and non-flammable, making it suitable for sensitive applications. Other important properties of aluminum include, but are not limited to:
On the other hand, aluminum alloys have a couple of disadvantages that you must consider. These disadvantages are:
Aluminum 6061
The 6061 aluminum alloy contains a mix of magnesium and silicon as its major alloying elements. It is precipitation-hardened and owns vital mechanical properties. The weldability of the 6061 alloys makes it the second most popular grade of aluminum, only behind the 6063 alloys.
The most relevant properties of the 6061 aluminum alloys include medium to high strength.
Aluminum 7075
The primary element found in the 7075 aluminum alloy is zinc. With zinc as the top alloying element, this aluminum grade obtains a series of properties that make it suitable for a wide variety of applications. The main properties of the 7075 aluminum alloy are:
The 7075 aluminum alloy indeed has lower corrosion resistance than many other aluminum alloys. However, it has significantly better corrosion resistance than the 2000 aluminum alloys.
Another critical aspect of this alloy is its relatively high cost. Use it only if your specific application requires the essential features of this alloy. Otherwise, you may be better off with a cheaper alloy.
Aluminum 5052
The 5052 aluminum alloy is one that cannot be treated with heat. The main feature is its good corrosion resistance, especially when exposed to saltwater. A modest characteristic of this alloy is machinability which is mostly considered to be fair.
Nevertheless, the machinability of this alloy can be improved by applying hard temper treatment instead of annealing. This also results in a better surface finish.
CNC Machining Aluminum Alloys
Now that you understand the advantageous properties of aluminum alloys for various applications, it’s equally important to recognize their machining challenges. Due to their relatively soft nature, aluminum alloys tend to adhere to cutting tools during machining, leading to increased friction, heat, and tool wear.
To ensure optimal results, your CNC machining provider must maintain efficient chip evacuation and proper coolant application throughout the process. This helps prevent tool buildup, preserve material integrity, and guarantee that the final product retains the desired mechanical and surface properties.
How Is Chip Accumulation Avoided?
The main way to avoid chip accumulation is by using the right cutting tool for the aluminum alloy. The tools that usually achieve it are those made of cemented carbides or diamond since they have almost no reaction with aluminum. Of course, tool manufacturers also provide solutions to the adherence of the chip on the tool. The most common are material selection and tool coating selection. With these two, tool designers reduce the possibility of chip accumulation on the tool’s edge.
In general, the main tools used for machining 6061, 7075, and 5052 aluminum alloys are:
Other Important Considerations
Something that requires careful attention when machining aluminum alloys is the interaction between the tool and the workpiece. In some cases, this interaction may result in abrasive flank wear, thus influencing the final shape and the dimensional accuracy as well as the integrity of the workpiece surface. Also, cutting forces in the machining of aluminum alloys should be kept low compared to the cutting forces used on ferrous alloys. This is because of the lower mechanical strength aluminum alloys have. This reduction in the cutting forces may generate 70% lower specific cutting pressures than in the machining of steels, preserving the integrity of the material. However, this difference is usually not noticeable from one aluminum alloy to the other, and the decision of changing the cutting forces will depend on the physical and chemical properties of the specific alloy. Obviously, this requires great expertise to be done properly.
Fortunately for you, Runsom’s 5-axis CNC machine shop is capable of machining parts to your specific requirements. We have the right machines and tools for the job, and our team has the expertise to guarantee high-quality results. If you need CNC machined aluminum parts, look no further. You won’t find a more capable and affordable source for specialized 5-axis CNC precision machined parts manufacturing.
No matter if you need only a very customized part or a big batch with specific requirements, we are ready to help you turn that idea into a reality. If you are ready to start or would like more information about our CNC precision machining services, contact us now and we’ll be glad to help you.
Conclusion
Aluminum alloys such as 6061, 7075, and 5052 continue to play a vital role in modern manufacturing, thanks to their excellent balance of strength, machinability, corrosion resistance, and lightweight characteristics. Each alloy offers unique benefits — from the weldability of 6061 and the high strength of 7075 to the superior corrosion resistance of 5052 — making them ideal for applications across aerospace, automotive, electronics, and consumer products industries.
However, achieving the best results in CNC aluminum machining requires more than just the right material choice. It demands advanced equipment, precise tool control, and deep technical expertise to manage challenges like chip accumulation, tool wear, and heat buildup — all while maintaining tight tolerances and smooth surface finishes.
That’s where Runsom Precision stands out. With extensive experience in 5-axis CNC machining and a proven track record in high-precision aluminum parts manufacturing, Runsom delivers reliable, efficient, and cost-effective solutions tailored to your exact specifications. Whether you need a prototype or high-volume production, our engineering team ensures every detail meets your expectations for performance and quality.
Partner with Runsom Precision today to unlock the full potential of CNC aluminum machining — combining innovation, accuracy, and craftsmanship in every part we produce.
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