Table 8 Results of the surface roughness variance analysis for the second test
Parameter | Degrees of freedom (DF) | Sum of squares (SS) | Mean of squares (MS) | F value | P value | Degree of impact (rank) |
|---|---|---|---|---|---|---|
Voltage | 1 | 4.311 | 4.311 | 4.293 | 0.0770 | 2 |
Current | 2 | 65.667 | 32.833 | 22.059 | 0.0017 | 1 |
Pulse-on time | 2 | 1.350 | 0.675 | 0.553 | 0.6021 | 4 |
Pulse-off time | 2 | 3.271 | 1.636 | 4.385 | 0.3224 | 3 |