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Choosing a CNC material starts with the part function
Material selection for CNC machining should start with the part function, operating environment, strength requirement, weight target, corrosion exposure, and finishing plan. A quote request is easier to review when the buyer explains why a material is needed instead of only naming a grade.
For early prototypes, engineers may choose an easy-to-machine material to validate fit. For production parts, the selected material may need to match strength, temperature, wear, appearance, or assembly requirements.
Aluminum parts
Aluminum is commonly used for brackets, housings, fixtures, robotics components, and product development parts. It is often selected for its balance of machinability, weight, and finish options.
Stainless steel parts
Stainless steel is used when corrosion resistance, strength, and durability are important. It usually requires more machining time than aluminum, so geometry and tolerance choices have a stronger cost impact.
Engineering plastics
Engineering plastics can be useful for insulation, low weight, wear resistance, or non-metal applications. Buyers should confirm whether the part needs dimensional stability, heat resistance, or chemical resistance.
Tolerance should follow function, not habit
Tolerances define what must be controlled during machining and inspection. Overly tight tolerances can increase cost and lead time, especially when they are applied to features that do not affect assembly or performance.
For quote clarity, the drawing should separate critical dimensions from general dimensions. If a dimension affects bearing fit, sealing, alignment, or assembly, it should be called out clearly.
Examples of tolerance-sensitive features
- Bearing bores and shaft fits
- Flat sealing faces
- Threaded holes near thin walls
- Matched assembly surfaces
- Features requiring repeatable position alignment
Surface finish changes both appearance and process
Surface finishing may improve corrosion resistance, wear behavior, color, or appearance. It can also change dimensions or add handling constraints. Buyers should include finish expectations early so the quote can include machining and finishing as one process plan.
| Finish type | Typical reason to request it |
|---|---|
| As machined | Fast prototype validation or functional internal parts. |
| Anodizing | Aluminum corrosion resistance, color, or cosmetic surface. |
| Bead blasting | Uniform matte appearance before or after machining. |
| Polishing | Visual improvement or smoother contact surfaces. |
| Black oxide | Dark finish on suitable steel parts where applicable. |
How to write a better overseas RFQ
Overseas RFQs should be clear enough for engineering review without requiring long email chains. A good request explains the part purpose, required files, quantity, material, finish, critical dimensions, and target schedule.
Recommended RFQ checklist
- Upload 3D CAD and 2D drawing files.
- State material and acceptable alternatives if possible.
- Mark critical tolerances and inspection needs.
- State prototype quantity and expected production quantity.
- Explain surface finish and cosmetic requirements.
- Share target delivery date and destination country.
When to ask for DFM feedback
DFM feedback is useful when a design is new, cost-sensitive, tolerance-heavy, or not yet frozen. It helps the buyer identify practical manufacturing issues before the part is machined.
If the supplier finds a risky feature, the buyer can decide whether to revise the design, accept the cost impact, or keep the original requirement for functional reasons.
Final note for template testing
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