Understanding CNC machining costs is crucial for accurate quoting and profitability analysis. Here’s your comprehensive 2025 guide.
The Basic Cost Equation
CNC cost per part = (Machine Rate × Machining Time) + Material Cost + Tooling Cost + Overhead + Profit
Step 1: Calculate Machine Hour Rate
| Component | Annual Cost |
|---|---|
| Machine depreciation | $5,000 – $30,000 |
| Operator labor | $40,000 – $70,000 |
| Electricity | $3,000 – $8,000 |
| Maintenance | $2,000 – $15,000 |
| Facility | $5,000 – $20,000 |
Example: $80k machine, 5-yr life: $87k annual cost ÷ 4,000 productive hours = $21.75/hr
Step 2: Estimate Machining Time
Typical material removal rates (3-axis VMC):
| Material | Roughing (cm³/min) | Finishing (cm³/min) |
|---|---|---|
| Aluminum | 80-120 | 40-60 |
| Steel | 30-50 | 15-25 |
| Stainless | 15-25 | 8-12 |
| Titanium | 5-10 | 3-6 |
Step 3: Material Cost
| Material | Density (g/cm³) | Price ($/kg) |
|---|---|---|
| Aluminum 6061 | 2.70 | $3 – $8 |
| Steel 4140 | 7.85 | $2 – $5 |
| Stainless 304 | 7.93 | $3 – $10 |
| Titanium G5 | 4.43 | $30 – $80 |
Step 4: Tooling Cost
Tool cost ÷ number of parts per tool life. Example: $80 end mill producing 500 parts = $0.16/part.
Step 5: Total Cost Example
| Component | Amount |
|---|---|
| Machine time (0.317 hrs) | $6.89 |
| Material (1.35 kg Al) | $6.75 |
| Tooling | $0.16 |
| Overhead (15%) | $2.07 |
| Total | $15.87 |
| Profit (30%) | $6.80 |
| Selling Price | $22.67 |
Cost Reduction Strategies
- Optimize part design for near-net-shape
- Use high-quality cutting tools
- Minimize setups with fixtures
- Consider 5-axis for complex parts
- Automate with bar feeders and robots
- Upgrade to rigid MAXIMA machines
Get Your Cost Analysis
The MAXIMA team offers free cost analysis and ROI calculation. Request yours today.
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