Homemade Small Hole EDM for under $20!

ing. The fluid also carries away any swarf. In this particular device, contact is made briefly to energize the coil of the solenoid, which retracts the electrode (tool) creating the spark gap which is what causes the arcing, depolarization of material and subsequent erosion. The erosion conforms to the shape of the die/tool/electrode, with slightly enlarged diameters compared to the tool.

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