Metal Stamping vs CNC Machining: Which Should You Choose?

Metal stamping and CNC machining can both produce custom metal components, but they suit different geometries and production requirements.

The best choice depends on the part itself, the expected order volume and how stable the design is.

How the Processes Differ

Metal stamping uses presses and tooling to cut or form sheet metal. It is commonly used for brackets, clips, washers and other sheet-based components.

CNC machining removes material using controlled cutting tools. Turning and milling can produce components with features such as shafts, pockets, stepped diameters and threads.

Start by reviewing the drawing rather than choosing a process based only on the lowest quoted unit price.

Compare the Part Geometry

A sheet-metal bracket with mounting holes and bends may be a candidate for stamping.

A solid component with several machined surfaces, bores or threaded features may be better suited to CNC machining.

Some designs require more than one process. A stamped component may need a secondary operation to complete a specific feature.

Stamped and CNC Machined Part Examples

Consider Tooling and Order Volume

Custom stamping may require dedicated dies. This creates an initial investment that can be spread across repeat production.

CNC machining typically requires programming and setup, and may also require dedicated fixtures. It can be suitable when the quantity is limited or the design is still developing.

There is no universal order quantity at which stamping becomes cheaper. The comparison depends on geometry, material, tooling and production time.

Review Design Changes and Tolerances

Frequent design changes can affect the value of investing in stamping tooling.

For either process, identify which dimensions are essential to assembly and function. Avoid applying unnecessarily tight tolerances to every feature.

Ask the manufacturer to review the drawing and explain which requirements may affect tooling, processing or inspection.

Compare the Complete Production Route

Request a quotation that identifies the relevant items:

• Tooling or setup
• Part production
• Secondary operations
• Surface treatment
• Inspection and packaging
• Estimated lead time

Compare quotations using the same drawing revision and requirements.

Dimensional Inspection of a CNC Machined Part

Discuss Your Project with GARBO

GARBO supports custom metal stamping parts and CNC machined components.

Send your drawing, material, initial quantity and expected repeat demand. Our team can review the requirements and discuss a suitable production route for your project.

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