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Article | 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

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4. Geometric specifications

4.1 General

There are four main types of geometric specifications defined in ISO 1101 :

  • geometric shape specifications ;

  • geometric orientation specifications ;

  • geometric position specifications ;

  • geometric runout specifications.

A geometric specification is used to describe a requirement by defining :

  • the toleranced element (the geometric element to be observed) ;

  • the tolerance zone with or without orientation or position constraints.

The tolerance zone is the area of variation allowed...

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