CIRP Encyclopedia of Production Engineering

2014 Edition
| Editors: The International Academy for Production Engineering, Luc Laperrière, Gunther Reinhart

Form Error

Reference work entry
DOI: https://doi.org/10.1007/978-3-642-20617-7_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 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 (freeform lines or sculptured surfaces):

  • For “profile any line” or “profile any...

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References

  1. DIN EN ISO 1101 (2004) Geometrical product specifications(GPS) – Geometrical tolerancing – Tolerances of form, orientation, location and run-out. International Organization for Standardization (ISO), Beuth, BerlinGoogle Scholar
  2. DIN EN ISO 12181–1 (2011) Geometrical product specifications (GPS) – Roundness – Part 1: vocabulary and parameters of roundness. International Organization for Standardization, Beuth, BerlinGoogle Scholar
  3. DIN EN ISO 14660–1 (1999) Geometrical product specifications (GPS) – Geometrical features - Part 1: General terms and definitions. International Organization for Standardization, Beuth, BerlinGoogle Scholar
  4. 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
  5. 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, pp 33–43Google Scholar
  6. 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
  7. 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
  8. Weckenmann A (2012) Koordinatenmesstechnik: Flexible Strategien für funktions- und fertigungsgerechtes Prüfen [Coordinate metrology: flexible strategies for function and manufacting related testing], 2nd edn. Hanser, München, p 273 (in German)CrossRefGoogle Scholar
  9. Weckenmann A, Eitzert H, Garmer M, Weber H (1995) Functionality-oriented evaluation and sampling strategy in coordinate metrology. Precision Eng 17(4):244–252CrossRefGoogle Scholar

Copyright information

© CIRP 2014

Authors and Affiliations

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