Optimization of Machining Parameters of Natural/Glass Fiber with Nanoclay Polymer Composite Using Response Surface Methodology

Table 4

Box–Behnken design used in machining study.

Run order	Std. order	Levels of independent factors
		Nanoclay (%)	Feed rate (mm/rev.)	Spindle speed (rpm)	Depth of cut (mm)
1	17	−1	0	−1	0
2	11	−1	0	0	1
3	8	0	0	1	1
4	20	1	0	1	0
5	18	1	0	−1	0
6	9	−1	0	0	−1
7	16	0	1	1	0
8	5	0	0	−1	−1
9	25	0	0	0	0
10	24	0	1	0	1
11	14	0	1	−1	0
12	10	1	0	0	−1
13	6	0	0	1	−1
14	12	1	0	0	1
15	1	−1	−1	0	0
16	22	0	1	0	−1
17	21	0	−1	0	−1
18	2	1	−1	0	0
19	7	0	0	−1	1
20	19	−1	0	1	0
21	13	0	−1	−1	0
22	15	0	−1	1	0
23	4	1	1	0	0
24	23	0	−1	0	1
25	3	−1	1	0	0