一種電火花設備，包括一工作電極。工件浸沒在絕緣性液體中，通常為油類，少數情況下也可以用其他不導電的液體。
Sinker Type EDMs have 3D capabilities and are ideal for mold making, micro hole drilling, creating shapes in fully-hardened metal components, and machining washers, keyways, scientific research app...
