Uncategorized
Aluminum CNC Machining vs Casting: Which Prototyping Process Is Right for Your Project?
CNC machining vs aluminum casting for prototypes: real cost, tolerance, and lead time data from our Dongguan shop floor. Which process fits your part?
Uncategorized
CNC Machining Materials Guide: How to Choose the Right Metal or Plastic | QDJ
Real CNC material selection guide from our Dongguan shop floor. Aluminum, stainless steel, PEEK, Delrin — what we actually machine, when to use each, and our free DFM review process.
Uncategorized
Verify Chinese CNC Supplier: How to Check Before You Send CAD
Our Dongguan factory floor — open for video walkthrough before you send CAD. Before you send your CAD to any … Read more
Uncategorized
Aluminium Prototype Guide: CNC Machining, Alloy Selection & Quality Verification
Aluminium prototypes machined on our 5-axis DMG MORI — tolerances down to ±0.005mm. Aluminium Prototype Guide: CNC Machining, Alloy Selection … Read more
Company News, Industry News
Prototype Aluminum Casting: Process & DFM Guide
Prototype aluminum casting is not automatically cheaper than CNC machining. It becomes the better route when your geometry, test objective, … Read more
What Is This Blog About?
The QDJ-PROTOTYPE blog is a practical engineering library for engineers, hardware founders, and procurement teams who need CNC machining and rapid prototyping parts from China. Every guide is written by the people who run the machines: real materials, real tolerances, real lead times — not generic marketing copy.
Factory Facts Behind These Guides
| Fact | Value |
|---|---|
| Company | Dongguan Qindejing Technology Co., Ltd. (Dongguan, China) |
| Experience | 12+ years |
| Team | 40+ members |
| Projects completed | 3,500+ |
| Customer satisfaction | 98% |
| Machining tolerance | ±0.001 mm to ±0.2 mm |
| Minimum order | MOQ 1, no tooling fee for CNC prototypes |
These facts are published on our About page and verified in our Verified Customer Testimonials — each review links to project data and inspection reports.
How to Use This Blog to Get Better Prototypes
- Start with the guide matching your process: CNC machining, 3D printing, injection molding, or aluminum casting.
- Check the material and tolerance guides before you finalize your design — material choice drives cost and lead time.
- Verify supplier claims with the Chinese supplier verification checklist before you send CAD files.
- Request a free DFM review with your first RFQ; our engineers reply with design feedback, not just a price.
Last updated: August 2026. Written by the QDJ-PROTOTYPE engineering team in Dongguan.