Why use CNC machining to make complex parts?
To understand why CNC machining is suitable for manufacturing complex parts, we must first understand the capabilities of modern manufacturing technology. Most CNC machines have been around for decades, and improvements in efficiency and operation have increased the ability of CNC machining to make complex parts.CNC machines are well suited to making complex parts for a number of reasons, including their operation, tolerances, and surface finish capabilities. 

Machine Cutting Axis
The capabilities of your machine determine the complexity of CNC cutting. Modern CNC technology allows for multiple axes of rotation and translation. This allows for the machining of highly complex features. 

Cutting tools and part features
The way a part is designed determines the level of complexity required to manufacture it. Yes, multi-axis machines can machine complex parts, but you also need to manufacture them cost-effectively. Using standard sized cutting tools whenever possible is a key way to manage costs.

Carbide and ceramic-coated tools are two of the best choices for CNC-machining parts, even the most complex ones, because they can cut hardened materials and are suitable for high-speed machining applications. However, these types of tools are expensive - so product development teams must determine if a high-complexity feature is truly necessary to justify the additional manufacturing requirements and costs.

Tolerances and surface finishes
Tight tolerances and surface finishes are key attributes of custom machined parts, which can add to the complexity of the part. The complexity of the part is determined by the geometry and dimensions as well as the precision and accuracy with which the part is machined. 

Work Holding

The complexity of a CNC machined part often depends on the quality and capabilities of the fixtures and jigs available. The fundamentals of stackup analysis can further explain how the quality of a fixture controls machining capability. However, design engineers must consider how the part is held within the machine, especially for highly complex designs. 

In CNC machining, part fixturing is successful when all fixtures and machining tools are securely fastened to the CNC machine, and the rigidity of the CNC machining setup is critical to ensuring the precision and accuracy of the finished product.

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