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Archive | REF: BM7010 V1

ISO recommendations for micro and macro geometry tolerancing of mechanical parts and their significance.

Authors: Serge-François GABRIEL, Rénald VINCENT

Publication date: April 10, 2011 | Lire en français

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    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).

    Note :

    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.

    Note :

    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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