Abstract: A hoop stress relief mechanism is disclosed for use on a rotary body to relieve stress caused by both thermal and centrifugal forces. The mechanism may consist of a J-shaped slot cut from the outer rim of the rotary body a distance inwardly toward the axis of rotation, the slot having a curve in its inward end that curves back towards the outer rim. The J-shaped slot may extend through the rotary body to join its two faces. The J-shaped slot may be fabricated by an electric discharge wire machine. The electric discharge wire machine may make multiple passes in order to smooth the bottom surface of the curved slot portion.

Abstract: A self piloting balance arbor for use in the dynamic balancing of gas turbine engine components having shafts extending therefrom. The arbor includes a cylindrical sleeve for receiving the shaft, and an annular flange at one end. A conical compliant member extends axially and radially inward from the flange to an end portion having two flat surfaces perpendicular to each other. Upon the application of a load to the arbor the two flat surfaces come into contact with the component, thereby correctly positioning the arbor relative to the component.

Abstract: The present invention provides a compliant nut that can provide a more consistent compressive force to engine components by using a compliant section to absorb axial deflections. The present invention also provides a self centering feature that positions the nut upon compression, reduces thread stresses and prevents nut and shaft runnout. The invention consists of an annular member having threads on the inner diameter for mating with a threaded shaft and having a conical portion extending axially and radially inward from the annular member for abutting engine components and the engine shaft. The nut includes a plurality of exciter teeth circumferentially disposed and extending radially from the annular member used to provide shaft speed signal for engine controls and a plurality of axial spline members extending axially from the annular member on the opposite face from conical section for mating with torque applying tools and locking mechanisms.