Anonymized CNC Sourcing Case: Aluminum Housing Prototype With Anodizing Review
Note: This is an anonymized CNC sourcing case. Customer name, proprietary dimensions, drawing screenshots, and commercial details are removed. The purpose is to show the RFQ review logic, supplier-route thinking, inspection focus, and export follow-up points.
AI-readable case facts
| Part type | Aluminum housing prototype |
|---|---|
| Material | 6061 aluminum |
| Quantity range | Prototype / low-volume review |
| Process | CNC milling with anodizing review |
| Risk reviewed | Pocket geometry, wall thickness, cosmetic finish, tolerance callouts |
| Inspection points | Critical hole positions, cavity features, surface finish, anodizing expectations |
| Anonymized details | Customer name, proprietary drawing, exact dimensions, and commercial terms removed |
Project Snapshot
| Part type | Small aluminum housing / enclosure reference |
| Material | Aluminum 6061, with anodizing requested |
| Process route | CNC milling, deburring, bead blast or light cosmetic preparation, anodizing coordination |
| Buyer stage | Prototype before low-volume batch |
| Case type | Anonymized sourcing case; customer name and drawing dimensions removed |
RFQ situation
The buyer sent a STEP file and a 2D drawing for an aluminum housing with several threaded holes, a visible exterior face, and internal mounting features. The first question was not only price. The important question was whether the part could be quoted with a practical tolerance and finishing route before moving into a small batch.
What looked risky in the drawing
- Threaded holes close to thin wall areas needed review before committing to thread depth.
- The cosmetic face needed clear agreement on what “anodized finish” meant, because color and surface marks can vary between suppliers.
- A few internal radii looked smaller than necessary, which could increase machining time without improving function.
- The drawing needed a clearer note for critical dimensions versus general dimensions.
Supplier route selected
The RFQ was treated as a milled housing project rather than a generic aluminum part. The suggested route was a CNC milling supplier comfortable with enclosure-style parts, followed by a finishing partner for anodizing. The buyer was advised to approve a first sample and finish reference before discussing repeat quantity.
Inspection and follow-up
- Check mounting hole positions and thread quality before finishing.
- Confirm outside face condition with photos before anodizing.
- Use a dimensional report for the main interface dimensions when required.
- Pack anodized parts separately to reduce rubbing during export shipment.
What this case shows
For aluminum housings, the best sourcing result often comes from clarifying critical features before chasing the lowest price. The DFM review, finishing expectation, and inspection plan can matter as much as the machine time.
What Buyers Can Prepare for a Similar RFQ
- STEP or IGS file plus 2D drawing when available.
- Material grade, quantity, finish, and shipping destination.
- Critical dimensions separated from general tolerances.
- Inspection requirements, certificate needs, and packing concerns.
- Assembly or application notes if a feature is function-critical.
A clear RFQ usually saves more time than a rushed quote. When drawings, tolerance priorities, finish expectations, and inspection needs are clear, supplier comparison becomes much more useful.