CIRP Encyclopedia of Production Engineering

2019 Edition
| Editors: Sami Chatti, Luc Laperrière, Gunther Reinhart, Tullio Tolio

Form Error

  • Albert A. WeckenmannEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-662-53120-4_6683

Synonyms

Definition

The form error deviation of the real (manufactured) feature (i.e., line, axis, surface, center plane) from the geometrically ideal nominal feature is to be measured and evaluated by analogy to the definition of the form tolerance in ISO 1101. It is the minimum distance of the quasi-parallel boundaries of a zone, in which the entire surface of a real feature, its line element, its axis, or its center plane remains. The boundaries of the zone are formed:
  • For standard features
    • In 2D case by two geometrically ideal 2D features (lines), which are in a common plane

    • In 3D case by two – geometrically ideal – nominal features

The nominal 3D features or the nominal 2D lines must show everywhere the same distance to each other (Euclidian distance evaluated for the entire feature mathematically by Chebyshev criterion).
  • For profiles (free-form lines or sculptured surfaces):
    • For “profile any line” or “profile any...

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References

  1. ISO 1101 (2012) Geometrical product specifications(GPS) – geometrical tolerancing – tolerances of form, orientation, location and run-out. International Organization for Standardization (ISO), GenevaGoogle Scholar
  2. ISO 12181–1 (2011) Geometrical product specifications (GPS) – roundness – Part 1: vocabulary and parameters of roundness. International Organization for Standardization, GenevaGoogle Scholar
  3. ISO 17450-1 (2011) Geometrical product specifications (GPS) – General concepts – Part 1: model for geometrical specification and verification. International Organization for Standardization, GenevaGoogle Scholar
  4. Humienny Z (2009) State of art in standardization in GPS area. CIRP J Manuf Sci Technol 2(1):1–7CrossRefGoogle Scholar
  5. Humienny Z, Weckenmann A, Bialas S, Osanna PH, Tamre M, Blunt L, Jakubiec W (2001) Geometrical product specification – course for technical universities. Printing House, WarsawGoogle Scholar
  6. Nielson HS (2012) Recent developments in ISO-GPS standards and strategic plans for future work. In: Jiang X (ed) Proceedings of the 12th CIRP conference on computer aided tolerancing – programme and abstracts, Huddersfield. pp 33–43Google Scholar
  7. Noppen G, Sigalla J (1990) Form- und Lagetoleranzen – Grundlagen [Form and position tolerancing – fundamentals]. Technische Mitteilungen [Engineering notes] Nr. 8904, Augsburg, MAN Technologie AG (in German)Google Scholar
  8. Srinivasan V (2012) Reflections on the role of science in the evolution of dimensioning and tolerancing standards. In: Jiang X (ed) Proceedings of the 12th CIRP conference on computer aided tolerancing – programme and abstracts, pp 18–32Google Scholar
  9. Weckenmann A (2012) Koordinatenmesstechnik: Flexible Strategien für funktions- und fertigungsgerechtes Prüfen [Coordinate metrology: flexible strategies for function and manufacturing related testing], 2nd edn. Hanser, München, p 273. (in German)CrossRefGoogle Scholar
  10. Weckenmann A, Eitzert H, Garmer M, Weber H (1995) Functionality-oriented evaluation and sampling strategy in coordinate metrology. Precis Eng 17(4):244–252CrossRefGoogle Scholar

Copyright information

© CIRP 2019

Authors and Affiliations

  1. 1.Quality Management and Manufacturing MetrologyUniversity Erlangen-NurembergErlangenGermany

Section editors and affiliations

  • M. Alkan Donmez
    • 1
  1. 1.National Institute of Standards and Technology (NIST), 100 Bureau Drive - Stop 8220GaithersburgUSA