1. Definitions
Nominal part geometry
Surface bounded by portions of simple geometric surfaces (planes, cylinders, cones, spheres, torus) or complex geometric surfaces (e.g. Bézier surfaces).
it is defined either by conventional drawings (2D drawing), or by a digital mock-up, or 3D model, in the case of computer-aided design (CAD).
Nominal geometric element
Point, line or surface that can be linked to nominal geometry.
the surface of a cylinder is a geometric element associated with a size (the cylinder's diameter). The axis of a cylinder is another geometric element (derived from the first: called the median element or derivative element).
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General concepts and principle of tolerancing
Bibliography
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