Patent ID: 6389692
Filing Date: 2002-05-21
Classification: B23P,B25B,F01D,F05D,Y10T

Abstract:
A method of removing a stuck locking pin from a turbine rotor, said locking pin comprising an elongate, generally cylindrical member having a first end, a longitudinal centerline axis, a width dimension, and a length dimension; said locking pin disposed within and extending through a locking pin receiving slot of said turbine rotor; the method comprising:providing an electrodischarge machining drill having a generally cylindrical electrode; forming an aperture in the first end of said locking pin with said electrodischarge machining drill; wherein said aperture extends along the longitudinal centerline axis of said locking pin; wherein said aperture has a diameter less than the width dimension of said locking pin, such that a generally cylindrical shell portion remains in said locking pin receiving slot of said turbine rotor; providing a high-strength metal rod having a diameter not greater than the diameter of said aperture formed in said locking pin; and driving said high-strength metal rod into said aperture to remove said shell portion from said locking pin receiving slot of said turbine rotor.