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Table 4 Input factors and their levels

From: Parametric optimization of powder mixed electrical discharge machining for nickel-based superalloy inconel-800 using response surface methodology

S.No Symbols Input factors Level Units
-1 0 1
1 A Current (Ip) 4 8 12 Ampere
2 B Pulse on-time (Ton) 60 90 120 μs
3 C Pulse off-time (Toff) 30 45 60 μs
4 D Tool material Copper Copper- Chromium Graphite _
5 E Powder (Suspended particles) Tungsten -carbide Cobalt Boron-Carbide _