Eccentricity (technology)
In technology, eccentricity is understood as the distance between the center points or the distance between the axes of symmetry of two form elements.
Such form elements, which usually belong to a single part, are often not equal. That is, the part itself has a center point or major axis. A structure belonging to this part also has a center point or an axis of symmetry. Such a subordinate form element could, for example, be a hole that was not made in the center of a symmetrical or rotationally symmetrical workpiece. Another example are the cams of a camshaft or an eccentric shaft .
The unintentional misalignment of two rotationally symmetrical form elements is called a runout error . Its maximum permissible size can be specified on a technical drawing as a positional tolerance .