We have a part.
Hole is toleranced true position to D, E & F
Where Datum D is the surface the hole penetrates (about 2" X 2")
Datum E is the centerline of the hole being toleranced along with nine other holes (A hinge centerline about 60" long), we best fit the ten holes to define E
F is a surface perpendiclar to the Datum D surface, rotated about the hinge centerline (D - 90 degrees).
D & E are theoretically normal, but when leveling to a 2" X 2" surface, the hinge line (E) can be out considerably over a 60" length.
They already have a separate perpendicularity call out from D to E.
They basically want the hinge holes in line and the surface perperndicular to it for the head of a bushing.
I suggested asking the customer to make E the primary Datum, this will more than likely never happen though.
How would you align this part?