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

Table 2

Parameters in drilling experiments.

S. No	Parameter	Symbol	Unit	Levels
				(−2)	(−1)	(0)	(1)	(2)
1	Spindle speed	V	Rpm	500	875	1250	1625	2000
2	Tool feed rate	F	mm/min	50	112.5	175	237.5	300
3	Drill diameter (mm)	D	Mm	4	6	8	10	12
4	Fiber orientation angle	Θ	Degrees	0	22.5	45	67.5	90