Material Removal Rate, Electrode Wear Rate, and Surface Roughness Evaluation in Die Sinking EDM with Hollow Tool through Response Surface Methodology

Table 3

Factors and their responses.

Run number	Factors			Responses
	Pulse off time; (s)	Pulse on time; (s)	Pulse current; (A)	Material removal rate; MRR (mm^3/min)	Electrode wear rate; EWR (mm^3/min)	Surface roughness; SR (m)
1	28	340	5	14.6	4.7	5.39
2	4	340	5	23.37	11.6	6.3
3	16	340	25	18.25	7.4	7.22
4	28	340	45	20.96	12.9	6.25
5	16	340	25	18.85	5.7	7.45
6	16	340	25	19.55	7.2	7.57
7	4	580	25	28.99	13.8	10.12
8	4	100	25	14.53	3.5	5.42
9	16	340	25	18.86	5.8	7.23
10	16	580	45	29.03	10.2	10.16
11	16	100	5	14	3.9	4.28
12	16	580	5	26.42	10.9	9.15
13	16	100	45	16.16	4.1	5.34
14	28	100	25	15.66	3.5	4.33
15	16	340	25	17.8	5.9	7.43
16	4	340	45	22.2	7.2	7.73
17	28	580	25	24.36	10.4	9.2