Influence of Drilling Parameters on the Delamination and Surface Roughness of Insulative-Coated Glass/Carbon-Hybrid Composite

Table 7

Response table for surface roughness (S/N ratio); smaller is better.

Level	Cutting speed	Feed rate	Coating thickness
1	-4.283	-3.531	-4.256
2	-4.017	-4.009	-3.876
3	-3.010		-3.565
4			-3.382
Delta	1.273	0.478	0.874
Rank	1	3	2