This document illustrates the ambiguity caused by the use of dimensional specifications to control properties other than linear or angular size and the benefit of using geometrical specifications instead. Dimensional tolerancing can be indicated by ± tolerancing or geometrical specifications. The ambiguity caused by using ± tolerances for dimensions other than linear or angular sizes (for individual tolerances and general tolerances according to, e.g. ISO 2768-1 and ISO 8062-3) is explained in Annex A. NOTE 1 The figures, as shown in this document, merely illustrate the text and are not intended to reflect actual usage. The figures are consequently simplified to indicate only the relevant principles. NOTE 2 For indications of dimensional specifications, see the following: — ISO 14405-1 for linear size; — ISO 14405-3 for angular size; — ISO 2538-1 and ISO 2538-2 for wedges; — ISO 3040 for cones. NOTE 3 The rules for geometrical specifications are given in ISO 1101.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles and rules for indication of dimensions and related tolerances
5 Units used in drawings for dimensions
6 Indication of tolerances for linear or angular dimensions
7 Illustrations of ambiguous ± tolerancing vs. unambiguous geometrical specifications
7.1 General
7.2 Linear distance between two integral features
7.3 Linear distance between an integral and a derived feature
7.4 Linear distance between two derived features
7.5 Radius dimension
7.6 Linear distance between non-planar integral features
7.7 Linear distance in two directions
8 Angular tolerancing
8.1 Examples of geometrical specifications applied to angular distance between two integral features
8.2 Angular distance between an integral feature and a derived feature
Annex A Explanations and examples of the ambiguity caused by using ± tolerances for dimensions other than linear size or angular size (informative)
Annex B Relation to the GPS matrix model (informative)
ISO 1101:2017 Geometrical product specifications (GPS) -- Geometrical tolerancing -- Tolerances of form, orientation, location and run-out
ISO 129-1:2018 Technical product documentation (TPD) -- Presentation of dimensions and tolerances -- Part 1: General principles
ISO 13715:2017 Technical product documentation -- Edges of undefined shape -- Indication and dimensioning
ISO 1101:2017 Geometrical product specifications (GPS) -- Geometrical tolerancing -- Tolerances of form, orientation, location and run-out
ISO 129-1:2018 Technical product documentation (TPD) -- Presentation of dimensions and tolerances -- Part 1: General principles
ISO 13715:2017 Technical product documentation -- Edges of undefined shape -- Indication and dimensioning
ISO 14405-1:2016 Geometrical product specifications (GPS) -- Dimensional tolerancing -- Part 1: Linear sizes
ISO 14405-3:2016 Geometrical product specifications (GPS) -- Dimensional tolerancing -- Part 3: Angular sizes
ISO 17450-1:2011 Geometrical product specifications (GPS) -- General concepts -- Part 1: Model for geometrical specification and verification
ISO 17450-2:2012 Geometrical product specifications (GPS) -- General concepts -- Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities
ISO 17450-3:2016 Geometrical product specifications (GPS) -- General concepts -- Part 3: Toleranced features
ISO 8015:2011 Geometrical product specifications (GPS) -- Fundamentals -- Concepts, principles and rules