Resolution of 0.9 degree rotation
The bearing, a R4 type, has no specification of tolerance of the shaft being off-axis.
An attempt was made to re-seat the press-fit R4 bearing in the hinge, gently tapping on the bearing body edge with a hammer. The bearing was press fit slightly off the plane of the hinge, the removal of this could have eliminated the 0.9 degree error. However, the bearing was both very positively press-fit into the hole, but also sealed with some sort of Loctite product, most probably.
Finally the decision was made to elongate the AN3 bolt holes very slightly to allow the hinge to be rotated back to the vertical. Discussions confirmed the acceptability of this approach, in this instance.
A needle file was used to elongate the holes slightly, to enable the hinge to be rotated
Very slight elongation - a small fraction of the AN3 bolt diameter
After clecoing in the rivet holes, match drilling redone so as to contact the hinge metal only. On exception to this is shown here, where a very slight elongation of the spar channel and doubler hole occurred
Checking with a 1/4" drill bit - angle error eliminated
Bolt 1 showing minimal gap
Bolt 2 showing minimal gap
Bolt 3 showing minimal gap
Bolt 4 showing minimal gap
Author
This post is from Adam Dickson
