Table 6: ANOVA interfamily surface roughness.

Source of varianceDOFSum of squares% contribution

Viscosity20.2370410.658
Depth20.0918804.131
Feed21.3720861.683
Speed20.1274805.732
40.1231405.537
40.0098100.441
40.0475402.1375
Error60.21509
Total262.22405