Method for tight control of bolt holes in fan assembly

A method for forming a bolt hole arrangement for an annular wall having an outer surface, an inner surface, and a bolt hole inner surface defining an annular wall bolt hole extending through the annular wall from the inner surface to the outer surface and having a bolt hole inner diameter, the method comprising:

• positioning a guide plate against the inner surface of the annular wall with a guide bolt hole of the guide plate substantially axially aligned with the annular wall bolt hole, wherein the guide plate has a shape that is complimentary to a shape of the inner surface of the annular wall, and wherein the guide bolt hole has a guide hole inner diameter that is less than the bolt hole inner diameter;
• applying an adhesive material to a bushing outer surface of a bushing having a cylindrical body with the bushing outer surface having a bushing outer diameter that is less than the bolt hole inner diameter and a bushing inner surface defining a cylindrical bore of the bushing having a bushing inner diameter that is approximately equal to the guide hole inner diameter;
• inserting the bushing into the annular wall bolt hole through the outer surface of the annular wall;
• inserting a guide bolt through the guide bolt hole and through the annular wall bolt hole through the inner surface, wherein the guide bolt engages the bushing inner surface to axially align the bushing with the annular wall bolt hole with an annular gap being formed between the bushing outer surface and the bolt hole inner surface with the adhesive material disposed within the annular gap;
• and
• allowing the adhesive material to harden and form a liquid shim separating the bushing outer surface from the bolt hole inner surface.