Diameter consistency is controlled through measurement, pull speed, cooling, tension and winding. A single nominal value does not prove production capability.
Control loop
- Laser or gauge measurement.
- Extrusion speed.
- Cooling distance.
- Winding tension.
Calibration
Adjust one variable at a time, record trends and verify with multiple points along the spool.
Acceptance
- Average.
- Spread.
- Ovality.
- Trend.
| Variable | Effect | Check |
|---|---|---|
| Pull | Diameter | Trend |
| Cooling | Surface | Uniformity |
| Tension | Winding | Spool |
| Measurement | Feedback | Calibration |
Common engineering mistakes
- One-point measurement.
- Ignoring oven/roller drift.
- No trend data.
- Mixing spools.
- Changing several parameters.
Buyer checklist
- Is the gauge calibrated?
- Are multiple points measured?
- Is cooling stable?
- Is winding tight and even?
- Is the trend recorded?
Discuss diameter control through our quote form.