Rotor for gas turbine engine

A gas turbine engine gasifier rotor comprising:

• a turbine including a bladed wheel having a tubular hub with an internal pilot diameter aligned on a longitudinal axis of said turbine perpendicular to the plane of said bladed turbine wheel,
• a tubular gasifier shaft having a cylindrical outside mounting pilot aligned on a longitudinal axis of said gasifier shaft closely received in said pilot diameter of said turbine hub when said turbine is disposed on said gasifier shaft for unitary rotation therewith,
• means defining a radial flange at one end of said gasifier shaft having an annular face in a plane perpendicular to said gasifier shaft longitudinal axis interrupted by a plurality of bolt holes symmetrically spaced around said annular face,
• a compressor rotating group having a longitudinal axis and an annular face at one end thereof in a plane perpendicular to said compressor rotating group longitudinal axis interrupted by a plurality of bolt holes corresponding in number and spacing to said bolt holes in said gasifier shaft annular face,
• said compressor rotating group annular face being juxtaposed said gasifier shaft annular face,
• a first wedge-shaped annular shim having a predetermined wedge angle and a plurality of bolt holes therein corresponding in number and spacing to said plurality of bolt holes in said gasifier shaft annular face,
• a second wedge-shaped annular shim identical to said first wedge-shaped annular shim,
• said first and said second wedge-shaped annular shims being disposed in face-to-face relationship between said juxtaposed annular faces on said compressor rotating group and on said gasifier shaft and defining an annular shim pack adjustable by relative rotation between said first and said second wedge-shaped annular shims through a discrete plurality of relative positions to provide a shim pack wedge angles variable between a minimum equal to zero at wedge-opposite relative positions of said first and said second wedge-shaped annular shims and a maximum equal to two times said predetermined wedge angle at wedge aligned relative positions of said first and said second wedge-shaped annular shims,
• said shim pack being adjusted to a shim pack wedge angle corresponding to an angle between the planes of said juxtaposed annular faces when said longitudinal axes of said gasifier shaft and said compressor rotating group are collinear, and
• a plurality of bolts through said bolt holes in said juxtaposed annular faces and in said first and said second wedge-shaped annular shim operative to clamp said compressor rotating groups to said gasifier shaft with said shim pack captured between said juxtaposed annular faces.