For prototypes and small batches (under 1,000 units), CNC machining is king. It requires no tooling investment and offers incredible precision. But as your production volume scales to 5,000, 10,000, or 100,000 units, CNC becomes a financial black hole.
The hidden killer? Cycle time and material waste.
The Rule of Thumb:
If your part is a hollow cylinder, box, or enclosure, and your annual volume exceeds 5,000 units, Deep Drawing will almost always be 30-50% cheaper than CNC machining.
Where Does the Money Go?
CNC Machining Cost Structure
- Material:High Waste. You pay for a solid block and turn 60% of it into scrap chips.
- Cycle Time:Slow. 3-10 minutes per part.
- Labor:High. Requires skilled operators and frequent tool changes.
Deep Drawing Cost Structure
- Material:Low Waste. You only pay for the sheet metal blank. Utilization >85%.
- Cycle Time:Fast. 20-60 parts per MINUTE.
- Labor:Low. Automated press lines run with minimal supervision.
The Break-Even Analysis
Let's look at a real example: A Stainless Steel Sensor Housing (Dia 50mm x Height 80mm).
| Cost Factor | CNC Machining | Deep Drawing |
|---|---|---|
| Tooling Cost (NRE) | $0 (Standard fixtures) | $8,500 (Progressive Die) |
| Unit Price (1k pcs) | $12.50 | $4.20 |
| Unit Price (10k pcs) | $11.80 | $1.85 |
| Total Cost @ 10k pcs | $118,000 | $27,000 (Parts) + $8,500 (Tooling) = $35,500 |
Total Savings: $82,500 (70%)
At 10,000 units, the tooling pays for itself in the first 1,000 parts.
When Should You Stick to CNC?
Deep drawing isn't magic. It has limitations. Stick to CNC if:
- Volume is under 2,000 units. The tooling cost won't amortize.
- Wall thickness varies. Deep drawing creates a uniform wall thickness (mostly). If you need thick bottoms and thin walls, you need machining or ironing (like in EV battery cans).
- Tolerances are tighter than +/- 0.05mm. (See our tolerances guide). Stamping is precise, but CNC is ultra-precise (+/- 0.01mm).
Do the Math for Your Part
Not sure if your part is ready for deep drawing? Send us your drawing. Our engineers will provide a free DFM analysis and a cost comparison within 24 hours.
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