Involute Spline Design and Machining Guide
Covers involute spline design, parameters like module 0.5~8mm and pressure angle 30°/37.5°/45°, plus rolling, milling, grinding and broaching processes.
Machining Process Comparison
Process selection for involute splines depends on the required accuracy grade, production volume and cost target. The table below compares the four common routes.
| Applicable Batch Size | Process | Accuracy | Efficiency | Cost |
|---|---|---|---|---|
| Large batch | Spline rolling | Grade 6~7 | High | Low |
| Small and medium batch | Spline milling | Grade 5~6 | Medium | Medium |
| High precision | Spline grinding | Grade 3~4 | Low | High |
| Large batch | Broaching (internal spline) | Grade 6~7 | High | Medium |
Key Design Parameters
- Module m: tooth profile size, commonly 0.5~8mm
- Number of teeth z: 6~60
- Pressure angle α: 30°/37.5°/45°
- Tolerance class: 4H~7H / 4h~7h
What Involute Splines Offer
Self-centering behaviour, even load sharing across the teeth and high load capacity are the reasons involute splines are specified in automotive transmissions, drive shafts for construction machinery, and comparable drive connections.