Fuzzy Linguistic Optimization on Surface Roughness for CNC Turning

Table 3

Degree of membership for surface roughness.

Fuzzy item	Interval
	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Excellent	1	0.8	0.6	0.4	0.2	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Good	0	0.2	0.4	0.8	1	0.6	0.4	0.2	0	0	0	0	0	0	0	0	0	0	0	0	0
Fair	0	0	0	0	0	0	0.2	0.4	0.6	0.8	1	0.8	0.6	0.4	0.2	0	0	0	0	0	0
Poor	0	0	0	0	0	0	0	0	0	0	0	0.2	0.4	0.6	0.8	1	0.8	0.6	0.4	0.2	0
Worst	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.2	0.4	0.6	0.8	1