Patent ID: 8020296

Claim:
A method for producing a secondary fluid duct for a turbomachine, comprising: the secondary fluid duct passing from a first side of a component to a second side, the secondary fluid duct having a contoured surface throughout including a first cross-section at the first side, a second cross-section and a third cross-section positioned between and being smaller than the first and second cross-sections, the second cross-section being positioned between the third cross-section and the second side; forming the first cross-section, a portion of the third cross-section, and the contoured surface therebetween by an electrochemical machining process with a first contour electrode fed from the first side; forming at least a portion of the second cross-section, a portion of the third cross-section, and the contoured surface therebetween, by an electrochemical machining process with a second contour electrode fed from the second side; configuring the first contour electrode and the second contour electrode to produce their respective contoured sections to smoothly merge together; and forming a portion of the second cross-section with the first contour electrode.