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

Table 4

Signal-to-noise ratios response table.

Peel up delamination-SN ratio
Level	Drill point angle (degree)	Speed (rpm)	Feed (mm/min)
1	−0.017799	−0.02317	−0.004922
2	−0.023874	−0.020505	−0.018942
3	−0.018182	−0.01618	−0.03599
Delta Δ	0.006075	0.00699	0.031068
Rank	3	2	1