A generator assembly apparatus is provided for merging a first annular component and a second annular component of a generator. The generator assembly apparatus includes first and second component support frames, a moving device and an adjustment device. The first component support frame supports the first component securely mounted to the first component support frame. The second component support frame supports the second component securely mounted to the second component support frame. The moving device moves one component support frame relative to the other component support frame to merge the components by inserting one component at least partially into an interior region of the other component. The adjustment device adjusts a position of a support frame such that a pre-defined separation between the first component and the second component is maintained during merging.