Minimization of Surface Roughness and Tool Vibration in CNC Milling Operation

Table 6

RSM design.

Run order	Coded parameters			Surface roughness ()			Tool life (min.)			Vibration amplitude (mm/sec^2)
				Actual value	Predicted value	Error % age	Actual value	Predicted value	Error % age	Actual value	Predicted value	Error % age
1	−1	−1	−1	0.85	0.89	−4.71	51.2	49.4	3.52	15	14.34	2.58
2	−1	−1	0	0.17	0.16	5.88	44.1	42.7	3.17	19	18.51	−3.95
3	−1	−1	1	0.3	0.29	3.33	34.8	36.01	−3.48	20	20.79	−5.85
4	−1	0	−1	0.88	0.84	4.55	33.5	34.79	−3.85	13	13.76	−5.47
5	−1	0	0	0.53	0.55	−3.77	27.9	29.07	−4.19	17	17.93	3.81
6	−1	0	1	1.08	1.12	−3.70	24.6	23.35	5.08	21	20.2	0.33
7	−1	1	−1	0.69	0.71	−2.90	19.6	20.19	−3.01	15	14.95	4.40
8	−1	1	0	0.9	0.86	4.44	14.6	15.44	−5.75	20	19.12	−1.90
9	−1	1	1	1.96	1.88	4.08	11.2	10.69	4.55	21	21.4	−1.15
10	0	−1	−1	0.29	0.28	3.45	29.3	30.6	−4.44	13	13.15	−3.00
11	0	−1	0	0.2	0.21	−5.00	24.8	25.67	−3.51	16	16.48	0.39
12	0	−1	1	0.15	0.16	−6.67	19.8	20.73	−4.70	18	17.93	1.27
13	0	0	−1	0.19	0.18	5.26	21.3	22.2	−4.23	15	14.81	4.47
14	0	0	0	0.125	0.13	−4.00	18.2	18.24	−0.22	19	18.15	2.05
15	0	0	1	0.9	0.94	−4.44	14.9	14.28	4.16	20	19.59	−1.44
16	0	1	−1	0.39	0.41	−5.13	14.52	13.8	4.96	18	18.26	−2.81
17	0	1	0	0.37	0.39	−5.41	11.21	10.81	3.57	21	21.59	−4.73
18	0	1	1	1.59	1.65	−3.77	8.2	7.83	4.51	22	23.04	−0.43
19	1	−1	−1	0.59	0.61	−3.39	12	11.81	1.58	14	14.06	−3.50
20	1	−1	0	0.37	0.36	2.70	9.1	8.63	5.16	16	16.56	−1.06
21	1	−1	1	0.92	0.97	−5.43	5.6	5.46	2.50	17	17.18	−5.76
22	1	0	−1	0.48	0.46	4.17	9.2	9.61	−4.46	17	17.98	−2.40
23	1	0	0	0.62	0.65	−4.84	7.1	7.41	−4.37	20	20.48	4.14
24	1	0	1	1.8	1.7	5.56	5.1	5.21	−2.16	22	21.09	1.33
25	1	1	−1	0.23	0.22	4.35	7.6	7.42	2.37	24	23.68	3.04
26	1	1	0	0.82	0.86	−4.88	5.9	6.19	−4.92	27	26.18	−3.04
27	1	1	1	2.49	2.36	5.22	4.77	4.96	−3.98	26	26.79	2.58