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In a wire-cut EDM process, the necessary conditions for making a successful cut are that

1. wire and sample are electrically non-conducting
2. wire and sample are electrically conducting
3. wire is electrically conducting and sample is electrically non-conducting
4. sample is electrically conducting and wire is electrically non-conducting

Correct answer: wire and sample are electrically conducting

Solution

Wire-cut EDM works by controlled electrical discharges between the wire electrode and the workpiece. For sparks to occur, both must be electrically conducting, while the gap is filled with dielectric fluid. Hence the correct condition is that both wire and sample are conducting.

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