Importance

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Abstract

An electrode or cathode assembly includes at least one electrode moveable relatively toward a workpart such as a turbine blade. The electrode includes a primary work face for machining the airfoil portion of the turbine blade. The electrode further includes secondary workfaces transverse to the primary workface for machining the shroud portion and the platform portion of the turbine blade which extend at negative angles transverses to the airfoil portion of the turbine blade. The primary workface comprises upper and lower electrode portions each having a plurality of fingers. The fingers of the upper electrode portion are alternatively disposed among the fingers of the lower electrode portion such that the opposing fingers interleave side by side with one another when the primary workface is closed. The fingers of the upper and lower electrode portions are expanded or moved in opposite directions to locate the secondary workface in a machining position adjacent the shroud portion and the platform portion of the turbine blade. The electrode is advanced toward the airfoil to locate the primary workface in a machining position adjacent the airfoil portion of the turbine blade.

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First Claim