Optimization of Drilling Parameters in Sisal-Human Hair Hybrid Composite Using Grey Relational Analysis

Table 5

Signal-to-noise ratios response table.

Push down delamination-SN ratio
Level	Drill point angle (degree)	Speed (rpm)	Feed (mm/min)
1	−0.03122	−1.66943	−1.23764
2	−3.35269	−1.42841	−1.25915
3	−0.47291	−0.75899	−1.36004
Delta Δ	3.32147	0.91044	0.12241
Rank	1	2	3