CNC Machining Vs Die Casting: Which One Is Right For Your Part?
Stop guessing. Our detailed comparison of cost, lead time, tolerances, surface finish, and design flexibility will help you select the optimal process for your precision components.
Quick Process Selection Scorecard
| Decision Factor | ⚙️ CNC Machining | 🏭 Die Casting |
|---|---|---|
| Production Volume | Best below ~500–1,000 parts | Ideal for 10,000+ parts/year |
| Typical Tolerance | ±0.005 mm (high precision) | ±0.05–0.1 mm (moderate) |
| Surface Finish (Ra) | 0.8–3.2 µm (excellent) | ~3 µm (smooth, may need post-machining) |
| Tooling Cost | Low (no dedicated tooling) | High ($10,000–$80,000+) |
| Lead Time (First Part) | Days (fast iteration) | 4–10 weeks (tooling development) |
| Design Flexibility | High (any geometry, easy changes) | Low (changes require mold rework) |
For a medium‑complexity aluminum part (die cost ~$20,000), die casting becomes more economical than CNC machining at approximately 3,000–8,000 units. If volume is uncertain or you need fast iteration, CNC machining offers unmatched flexibility.
Head-To-Head Technical Comparison
Tolerances & Precision
CNC Machining: Achieves tolerances down to ±0.005 mm.
Die Casting: Typical tolerances of ±0.05–0.1 mm.
Lead Times & Speed
CNC Machining: Lead times of 3–7 days for prototypes.
Die Casting: 4–10 weeks for tool development.
Cost Structure
CNC Machining: Low initial investment, best below 1,000 units.
Die Casting: High tooling cost ($20k–$80k+), break‑even 3k–8k units.
Design Flexibility
CNC: Unrestricted geometry, easy changes.
Die Casting: Requires draft angles, uniform wall thickness.
Cost & Volume Decision Matrix
Total cost, including amortized tooling, determines the most economical path for your project volume.
| Volume (Units) | Recommended Process | Why? |
|---|---|---|
| 1 – 100 | ⚙️ CNC Machining | No tooling cost. Ideal for prototypes. |
| 100 – 5,000 | ⚙️ CNC Machining or Bridge Tooling | CNC still economical; casting viable at higher end. |
| 5,000 – 20,000 | Hybrid or 🏭 Die Casting | Tooling amortization justifiable. Hybrid approach common. |
| 20,000+ | 🏭 Die Casting | Lowest per-unit cost. Ideal for mass production. |
RFQ Checklist: What To Prepare For Accurate Quotes
3D CAD Model
Provide a 3D CAD model (STEP is preferred) to define the geometry.
2D Drawing With GD&T
Include all critical dimensions, geometric tolerances, surface finish, and notes.
Inspection Requirements
Specify if a standard report, CoC, CMM, or FAI is needed.
Case Study: Aerospace Bracket – From Prototype To Production
Frequently Asked Questions
Precision CNC Machining & Die Casting – Capabilities & Quality
Batnon provides comprehensive manufacturing solutions, from CNC machining to high-pressure die casting, for the medical, aerospace, robotics, and industrial equipment sectors. Our engineering team supports you from DFM analysis to final production.
CNC Machining Capabilities: 3-axis, 4-axis, and 5-axis milling, turning, and EDM. Typical tolerances held to ±0.005mm for critical-to-quality (CTQ) features. Material portfolio includes aluminum (6061, 7075), stainless steel (303, 304, 316, 17-4), titanium (Gr5, Gr23), and engineering plastics like PEEK, POM, and ABS.
Die Casting Capabilities: High-pressure die casting for aluminum alloys (A380, ADC12), with in-house tool design and fabrication. We provide design-for-manufacturing (DFM) support to optimize part geometry for castability, including draft angle analysis and wall thickness optimization.
Quality Assurance: All parts are subject to rigorous inspection. Deliverables include Certificate of Conformance (CoC), CMM full reports, AS9102 First Article Inspection (FAI), Material Test Reports (MTRs), and surface finish analysis. We operate under a strict ISO 9001 quality management system.
Ready To Choose The Right Process For Your Part?
Upload your CAD file and specifications. Our engineers will provide a detailed DFM review, process recommendation, and a firm price.