Eccentricity should always be shown using two views. This is necessary to establish the correct relationship between the two axes (centers) as well as accurately locating any other functional surfaces on the piece.

An example of how one view of a piece with eccentric surfaces can be misleading is shown in views A and C of Drawing #14. Without views B and D, a piece conforming to view B would be indicated, when actually a piece conforming to view D could be required.

When the eccentricity is as shown in views C and D, both views are essential. Requiring a flat surface with a definite relationship to the eccentric cylinder further emphasizes the necessity for two views.

To locate the small diameter cylinder properly, an angle relationship to the flat on the large cylinder is shown.

Note: Always use enough views to show each surface in its proper relationship to the other surfaces.

Eccentricity drawing