Surface Roughness Models and Their Experimental Validation in Micro Milling of 6061-T6 Al Alloy by Response Surface Methodology

Table 4

The test design matrix and results.

S. number	Design									, average surface; roughness (m)
	1	−1	−1	−1	1	1	1	1	1		1	1.315
2	1	−1	−1	1	1	1	−1	−1	1	1.016
3	−1	1	−1	1	1	1	−1	1	−1	1.436
4	1	1	−1	1	1	1	1	−1	−1	1.001
5	−1	−1	1	1	1	1	1	−1	−1	1.503
6	1	−1	1	1	1	1	−1	1	−1	1.117
7	−1	1	1	1	1	1	−1	−1	1	1.402
8	1	1	1	1	1	1	1	1	1	1.301
9	−2	0	0	4	0	0	0	0	0	1.511
10	2	0	0	4	0	0	0	0	0	1.113
11	0	−2	0	0	4	0	0	0	0	1.008
12	0	2	0	0	4	0	0	0	0	1.349
13	0	0	−2	0	0	4	0	0	0	1.165
14	0	0	2	0	0	4	0	0	0	1.304
15	0	0	0	0	0	0	0	0	0	1.271
16	0	0	0	0	0	0	0	0	0	1.269
17	0	0	0	0	0	0	0	0	0	1.238
18	0	0	0	0	0	0	0	0	0	1.256
19	0	0	0	0	0	0	0	0	0	1.247