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CNC Machining eBook
If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining.
Here, we’ve gathered some basic information and important considerations to help you achieve the desired results.
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Advanced magnesium CNC machining services for reliable solutions for your manufacturing needs. Get instant quotes, fast lead times, and competitive pricing.
Magnesium is an exceptional metal renowned for its lightweight nature and remarkable strength. It ranks as the third most widely utilized metal, after iron and aluminum, and it plays a crucial role in numerous industries. Magnesium is increasingly popular in CNC machining due to its excellent strength-to-weight ratio. It is also highly regarded for its exceptional machinability and its capability to fabricate intricate and precise components. Its superior damping capacity makes it suitable for automotive, aerospace, and electronics industries. Despite its flammability concerns, with proper precautions, magnesium offers unparalleled benefits in high-performance applications.
| Available Magnesium at RapidDirect: | Magnesium Alloy AZ31B, AZ91D |
| Price: | $$$$$ |
| Lead Time: | < 10 days |
| Wall Thickness: | 0.75 mm |
| Tolerances: | ±0.005″ (±0.125mm) |
| Max Part Size: | 200 cm x 80 cm x 100 cm |
AZ31B is a highly versatile alloy with extensive applications across a range of industries. It is highly regarded for its exceptional machinability, lightweight properties, and weldability. The alloy consists primarily of 3% aluminum and 1% zinc. It provides enhanced strength compared to pure magnesium, effective vibration damping, and exceptional resistance to corrosion. It is frequently employed in constructing aircraft fuselages, camera bodies, laptop frames, and more.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 180 - 240 | 100 | 6 - 20 | 50 - 70 | 1.77 |
AZ91D is the most commonly used magnesium alloy. It is a high-purity cast alloy comprising 9% aluminum and 1% zinc. It is appreciated for its high strength, excellent castability, and good corrosion resistance. As a result, it is extensively utilized in automotive parts, electronic devices, and aerospace components.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 150 - 160 | 90 | 3 - 7 | 60 - 70 | 1.81 |




Since magnesium parts are prone to machining defects and formation of burrs, it’s important to treat them with the right surface finishes. This will improve their aesthetic appeal and enhance performance and longevity. At RapidDirect, we offer an extensive range of surface finishing options tailored to your requirements, ensuring optimal protection and visual quality for your magnesium parts.
Magnesium machining offers several advantages, making it a preferred choice for many industries. However, certain drawbacks must be considered.
CNC machined magnesium parts are widely used in various sectors due to their unique properties:
Yes, magnesium is safe for machining when proper precautions are taken. Its flammability can be managed by using specialized equipment and techniques. This includes maintaining a clean work area to prevent chip accumulation, using appropriate cutting fluids to reduce heat, and ensuring that tools are sharp to minimize friction. Fire extinguishing measures, such as having Class D fire extinguishers on hand, are also essential.
Magnesium machining offers several advantages over aluminum. It is lighter and has better machinability. It also requires lower cutting force. These allow it to be machined faster with less tool wear, resulting in lower production costs. Magnesium also has superior damping properties, making it ideal for applications requiring vibration absorption.
Magnesium parts should be stored in a dry, well-ventilated environment and away from moisture and corrosive elements. Additionally, magnesium parts should be kept separate from materials that could cause galvanic corrosion, such as steel or other dissimilar metals. Proper packaging, using materials like VCI (volatile corrosion inhibitor) paper, can also help protect against environmental factors.
Magnesium is commonly alloyed with elements like aluminum, zinc, and manganese to enhance its properties. These alloys improve strength, corrosion resistance, and machinability while maintaining the lightweight characteristics of magnesium. For example, AZ91D (magnesium-aluminum-zinc) is widely used in the automotive and electronics industries due to its good castability and strength.