Analysis of Drilling of Coir Fiber-Reinforced Polyester Composites Using Multifaceted Drill Bit

Table 4

Coded values, real values, and delamination.

Exp. no.	Coded value				Real value
	Spindle speed (rpm)	Tool feed rate (mm/min)	Drill diameter (mm)	Fiber orientation angle, degrees	Spindle speed (rpm)	Tool feed rate (mm/min)	Drill diameter (mm)	Fiber orientation angle, degrees	Delamination
1	−1	−1	−1	−1	875	112.5	6	22.5	1.36
2	1	−1	−1	−1	1625	112.5	6	22.5	1.26
3	−1	1	−1	−1	875	237.5	6	22.5	1.25
4	1	1	−1	−1	1625	237.5	6	22.5	1.83
5	−1	−1	1	−1	875	112.5	10	22.5	1.43
6	1	−1	1	−1	1625	112.5	10	22.5	1.12
7	−1	1	1	−1	875	237.5	10	22.5	1.36
8	1	1	1	−1	1625	237.5	10	22.5	1.56
9	−1	−1	−1	1	875	112.5	6	67.5	1.46
10	1	−1	−1	1	1625	112.5	6	67.5	1.15
11	−1	1	−1	1	875	237.5	6	67.5	1.32
12	1	1	−1	1	1625	237.5	6	67.5	1.5
13	−1	−1	1	1	875	112.5	10	67.5	1.79
14	1	−1	1	1	1625	112.5	10	67.5	1.15
15	−1	1	1	1	875	237.5	10	67.5	1.7
16	1	1	1	1	1625	237.5	10	67.5	1.5
17	−2	0	0	0	500	175	8	45	1.48
18	2	0	0	0	2000	175	8	45	1.31
19	0	−2	0	0	1250	50	8	45	1.27
20	0	2	0	0	1250	300	8	45	1.54
21	0	0	−2	0	1250	175	4	45	1.38
22	0	0	2	0	1250	175	12	45	1.49
23	0	0	0	−2	1250	175	8	0	1.42
24	0	0	0	2	1250	175	8	90	1.5
25	0	0	0	0	1250	175	8	45	1.26
26	0	0	0	0	1250	175	8	45	1.31
27	0	0	0	0	1250	175	8	45	1.27
28	0	0	0	0	1250	175	8	45	1.36
29	0	0	0	0	1250	175	8	45	1.35
30	0	0	0	0	1250	175	8	45	1.42