Process Selection
CNC Machining vs Injection Molding: Which Process Fits Your Part?
Compare CNC machining and injection molding for prototypes, production quantity, tooling cost, material choice, tolerance, and custom part quoting.
Use CNC machining for precision and lower setup risk
CNC machining is often suitable for prototypes, low-volume production, metal parts, tight tolerance features, fixtures, brackets, housings, and parts that need fast design iteration.
- No mold tooling required
- Good for aluminum and stainless steel
- Useful for prototypes
- Strong tolerance control
Use injection molding for repeat plastic production
Injection molding is practical when the part design is stable and the buyer needs repeat production, consistent plastic material, tooling support, and unit cost control at volume.
- Requires mold tooling
- Good for PA66, ABS, PC, POM
- Best for repeat parts
- Supports connectors, clips, covers, and housings
FAQ
Which process is better for prototypes?
CNC machining or 3D printing is often faster for prototypes because injection molding requires tooling.
When does injection molding make sense?
Injection molding makes sense when annual demand, repeatability, and unit cost justify tooling.
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