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

Table 2

Factors and their levels.

Serial number	Symbols	Input factors	Levels			Units
			1	2	3
1	A	Pulse on time	100	340	580	s
2	B	Pulse off time	4	16	28	s
3	C	Peak current	5	25	45	A