Investigation of Drilling Parameters Using Grey Relational Analysis and Response Surface Methodology of Biaxial Glass Fibre Reinforced with Modified Epoxy Resin Composite

Figure 8

Surface roughness for 2 and 3 mm thickness specimens under three different drills. (a–c) Surface roughness of the 2 mm sample with (a) HSS drill, (b) titanium-coated HSS drill, and (c) carbide tip drill. (d–f) Surface roughness of the 3 mm sample with (d) HSS drill, (e) titanium-coated HSS drill, and (f) carbide tip drill.

(a)

(b)

(c)

(d)

(e)

(f)