Optimization of Surface Roughness in Drilling Medium-Density Fiberboard with a Parallel Robot

Table 4

The results of experiments and S/N ratio values.

Experiment no.	Control factors			Surface roughness, Ra (μm)	S/N ratio for Ra (dB)
	A	B	C
	Point angle (α)	Cutting speed (V)	Feed rate (f)
1	118	15.7	0.01	3.08	−-9.7710
2	118	15.7	0.03	4.072	−12.1962
3	118	15.7	0.05	4.862	−13.7363
4	118	31.4	0.01	2.479	−7.8855
5	118	31.4	0.03	3.269	−10.2883
6	118	31.4	0.05	4.186	−12.436
7	118	47.1	0.01	2.122	−6.5349
8	118	47.1	0.03	2.883	−9.1968
9	118	47.1	0.05	3.486	−10.8465
10	135	15.7	0.01	3.837	−11.6798
11	135	15.7	0.03	4.886	−13.7791
12	135	15.7	0.05	5.864	−15.3639
13	135	31.4	0.01	3.249	−10.235
14	135	31.4	0.03	3.975	−11.9867
15	135	31.4	0.05	4.758	−13.5485
16	135	47.1	0.01	3.029	−9.6259
17	135	47.1	0.03	3.43	−10.7059
18	135	47.1	0.05	4.212	−12.4898