Patent ID: 7845076

Claim:
A method of reducing stresses susceptible from partially re-machining a generator rotor tooth dovetail, the re-machining resulting in a transition zone at an end of the partial re-machined cut, between a newly cut load surface and an original load surface of the rotor tooth, the method comprising: (a) providing the generator rotor tooth dovetail; (b) determining locations and dimensions of a first axial undercut stress relief groove and a second axial undercut stress relief groove; (c) re-machining the generator rotor tooth dovetail by machining the first axial undercut stress relief groove at a first fillet radius below the original load surface; and (d) further re-machining the generator rotor tooth dovetail by machining the second axial undercut stress relief groove at a second fillet radius below the newly cut load surface.