Input variables and their levels CCD
| Independent input variation | Coded variables levels | ||||
|---|---|---|---|---|---|
| −α | Minimum | Median | Maximum | +α | |
| Tapered angle (degree) | 00 | 3.750 | 7.50 | 11.250 | 150 |
| Thickness (mm) | 0.25 | 0.438 | 0.625 | 0.813 | 1 |
| Twist angle (degree) | 00 | 22.50 | 450 | 67.50 | 900 |
| Independent input variation | Coded variables levels | ||||
|---|---|---|---|---|---|
| − | Minimum | Median | Maximum | + | |
| Tapered angle (degree) | 00 | 3.750 | 7.50 | 11.250 | 150 |
| Thickness (mm) | 0.25 | 0.438 | 0.625 | 0.813 | 1 |
| Twist angle (degree) | 00 | 22.50 | 450 | 67.50 | 900 |
Source(s): The authors
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