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Various levels of four factors, including spindle speed, feed rate, and depth of cut, used in the experiments.
| Notation | Factor/Level | Tool Diameter (T1) 200 µm | Tool Diameter (T2) 400 µm | ||||
|---|---|---|---|---|---|---|---|
| −1 | 0 | 1 | −1 | 0 | 1 | ||
| A | Spindle speed (rpm) | 10,000 | 15,000 | 20,000 | 10,000 | 15,000 | 20,000 |
| B | Feed rate (mm/min) | 50 | 100 | 150 | 50 | 100 | 150 |
| C | Depth of cut (µm) | 5 | 10 | 15 | 5 | 10 | 15 |
