Die casting and CNC machining are two widely used manufacturing processes for producing metal components. Both can achieve accurate and reliable parts, but they are suited to different production volumes, geometries, materials and cost requirements.
For many projects, the decision is not simply choosing die casting or CNC machining. The most effective manufacturing approach may combine both processes: die casting for efficient near-net-shape production, followed by CNC machining for critical dimensions and functional features.
Understanding the differences can help engineers select a more suitable manufacturing route before tooling and production begin.
Die Casting
High-pressure die casting uses a reusable steel mold to produce metal components by injecting molten alloy into the die cavity under pressure.
The process is particularly suitable for medium- to high-volume production where consistent geometry, repeatability and production efficiency are important.
Typical advantages of die casting include:
• Efficient production for medium and high volumes
• Complex geometries and integrated features
• Good dimensional repeatability
• Thin-wall structures can be achievable depending on part design
• Reduced machining requirements through near-net-shape production
• Suitable for aluminum and zinc alloy components
The main consideration is tooling. A dedicated die-casting mold must normally be developed before mass production, creating an upfront tooling investment.
For projects with stable designs and sufficient production volume, this tooling cost can be distributed across the total production quantity.
CNC Machining
CNC machining removes material from solid stock or a preformed component using computer-controlled cutting tools.
Unlike die casting, CNC machining generally does not require dedicated casting tooling, making it suitable for prototypes, low-volume production and components requiring precise machined features.
Typical advantages of CNC machining include:
• No die-casting tooling required for parts machined directly from stock
• Suitable for prototypes and lower production quantities
• High dimensional accuracy
• Flexible design changes during development
• Suitable for critical holes, threads, sealing surfaces and interfaces
• Wide selection of machinable materials
However, machining an entire component from solid material can become less economical as production quantities increase, particularly when substantial material removal and long machining cycles are required.
Die Casting vs CNC Machining: Key Considerations
Production Volume
CNC machining can be more practical for prototypes and small production quantities because dedicated die-casting tooling is not required.
As production volume increases, die casting can become more economical because the tooling investment is distributed across a larger number of parts and cycle times are typically much shorter than machining a complete component from solid stock.
Part Geometry
Die casting is well suited to components with complex shapes, ribs, bosses, mounting features and integrated structures that can be formed directly during casting.
CNC machining provides greater flexibility for geometries that can be accessed by cutting tools and is especially useful where tight dimensional control is required.
Material Utilization
Die casting produces components close to their final geometry, helping reduce the amount of material that must be removed afterward.
Machining from solid stock may generate considerably more chips and material waste, depending on the geometry of the component.
Tooling Investment
Die casting requires an initial investment in tooling.
CNC machining generally has a lower initial tooling requirement, making it attractive during development or when production quantities are limited.
Dimensional Requirements
Die casting can provide good repeatability, but some functional dimensions may still require secondary machining.
Bearing seats, sealing surfaces, precision bores, threaded holes and critical mounting interfaces are commonly CNC machined after casting.
Why Die Casting and CNC Machining Are Often Used Together
For many production components, die casting and CNC machining should not be viewed as competing processes.
A common manufacturing route is:
Die Casting → Trimming / Deburring → CNC Machining → Surface Finishing → Inspection
The die-casting process creates the main component geometry efficiently, while CNC machining is applied only where additional dimensional accuracy or functional features are required.
This approach can reduce machining time and material waste compared with machining the entire component from solid stock while still maintaining control over critical dimensions.
Choosing the Right Manufacturing Process
The appropriate manufacturing method depends on several factors:
• Expected annual production volume
• Component size and geometry
• Material requirements
• Dimensional tolerances
• Surface requirements
• Tooling budget
• Project life cycle
• Secondary machining requirements
For early prototypes or low-volume projects, CNC machining may provide greater flexibility.
For stable medium- or high-volume production, die casting may provide significant advantages in production efficiency and unit cost.
For many industrial components, combining die casting with selective CNC machining provides the best balance between manufacturing efficiency, dimensional control and overall cost.
From Drawing Review to Production
At Bodurm, we support custom metal component projects from drawing review and tooling development through die casting, CNC machining, secondary operations and quality control.
Our manufacturing capabilities include aluminum and zinc die casting, CNC machining and project-specific secondary processing for automotive, motorcycle, lighting, industrial and other applications.
Before tooling begins, our team can review component geometry, production volume, machining requirements and surface specifications to help determine an appropriate manufacturing approach.
Send Us Your Drawings
If you are evaluating die casting, CNC machining or a combination of both processes for a new component, send us your drawings or 3D files together with your estimated production quantity and technical requirements.
Our team can provide a preliminary manufacturing review before tooling and production.