CNC Aluminum Extrusions vs. Traditional Extrusions- Which to Choose？

The decision between CNC aluminum extrusions and traditional extrusions depends on the specific requirements of your application. Both options offer unique advantages and drawbacks that should be carefully considered. This article explores the key differences between these two extrusion methods to help you make an informed choice.

Precision and Accuracy

CNC aluminum extrusions are produced using computer numerical control (CNC) machines, which provide extremely high levels of precision and accuracy. The CNC process allows for the creation of complex geometries and tight tolerances that would be difficult or impossible to achieve with traditional extrusion methods.

Traditional extrusions are produced by forcing molten aluminum through a die, which results in a less precise and accurate product. Variations in die size and shape can lead to inconsistencies in the final product’s dimensions and surface finish.

Design Flexibility

CNC aluminum extrusions offer greater design flexibility than traditional extrusions. With CNC machining, complex profiles and intricate shapes can be created without the need for custom tooling. This allows for the production of parts with unique features and functionality.

Traditional extrusions are limited to simpler shapes and profiles that can be achieved through the use of standard dies. Custom dies can be created, but this can be a costly and time-consuming process.

Surface Finish

CNC aluminum extrusions typically have a better surface finish than traditional extrusions. The CNC process allows for the use of precision cutting tools to create a smooth and consistent finish. Additionally, CNC extrusions can be anodized or polished to further enhance their appearance.

Traditional extrusions have a rougher surface finish due to the extrusion process. This finish can be improved through additional processing, such as sanding or painting, but it may not achieve the same level of smoothness as CNC extrusions.

Strength and Durability

CNC aluminum extrusions are generally stronger and more durable than traditional extrusions. The use of CNC machining allows for the creation of uniform cross-sections and optimized structural integrity. This results in parts that are less prone to bending, warping, or breaking.

Traditional extrusions can be less strong and durable due to variations in die size and shape. This can lead to weaknesses in the material and a shorter lifespan.

Cost and Lead Time

CNC aluminum extrusions are typically more expensive than traditional extrusions due to the higher precision and design flexibility they offer. The cost of CNC extrusions will also depend on the complexity of the part and the quantity ordered.

Traditional extrusions are less expensive than CNC extrusions, but the cost of custom dies should be taken into account if non-standard shapes are required. The lead time for CNC extrusions is typically longer than for traditional extrusions due to the need for programming and setup.