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. 2019 Apr 11;10(4):240. doi: 10.3390/mi10040240

Figure 3.

Figure 3

In-line calculation of the four quantities that are investigated as potential indicators for the process fingerprint of the micro electrical discharge machining (micro-EDM) drilling process (np: Number of normal discharge pulses, ns: Number of short circuits and arcs, uo: Open voltage, um: Average gap voltage, Δz: Nominal drilling depth, t: Drilling time, fp: Frequency of normal discharge pulses, fs: Frequency of short circuits and arcs, fr: Feed rate, Δu: Differential voltage).