Abstract: Electrolytic process and apparatus employs the shroud and depending blades as anodes about a multi-cathode device in a bond material solutionizing electrolyte for obtaining proper contour smoothness without structural depletion of the shroud and/or blades.

Abstract: Ceramic shell molds are removed from cast turbine blades by contacting the shell mold with a concentrated solution of HF whereby the binder of the shell is destroyed and the shell material falls away from the metal casting.

Abstract: Apparatus is described which enables close tolerance electro-chemical milling of the leading and trailing edges of blades used in gas turbine engines. Using turbine blades formed with the edges slightly oversize in the as-cast condition, electro-chemical milling is used to properly shape the leading and trailing edges. The apparatus comprises an insulated body having a slot shaped to accept the turbine blade. The two outer edges of the slot are fitted with lengthwise slotted metallic tubing which receives the edges of a blade and which forms a channel for a supply of electrolyte for milling the blade edges. Means are provided for accurately positioning the blade within the body.