GB/T 38762.2-2020 Geometrical product specifications(GPS)—Dimensional tolerancing—Part 2:Dimensions other than linear or angular sizes (English Version)
Geometrical product specifications (GPS) - Dimensional Tolerancing - Part 2: Dimensions other than linear or angular sizes
1 Scope
This part of GB/T 38762 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 may be indicated by ± tolerancing or geometrical specifications.
The ambiguity caused by using ± tolerances for dimensions other than linear sizes (for individual tolerances and general tolerances according to, e.g.GB/T 1804 and GB/T 6414) 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:
——GB/T 38762.1 for linear size;
——GB/T 38762.3 for angular size;
——ISO 2538-1 and ISO 2538-2 for wedges;
——GB/T 15754 for cones.
Note 3: The rules for geometrical specifications are given in GB/T 1182.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1182 Geometrical product specifications(GPS) - Geometrical tolerancing - Tolerances of form ,orientation, location and run-out (GB/T 1182-2018，ISO 1101:2017, MOD)
GB/T 4249 Geometrical product specifications (GPS) - Fundamentals - Concepts, principles and rules (GB/T 4249-2018, ISO 8015:2011, MOD)
GB/T 19096 Technical drawing-Drawing presentation-Vocabulary and indications for edges of undefined shape (GB/T 19096-2003, ISO 13715-2000, IDT)
GB/T 24637.1 Geometrical product specifications (GPS) - General concepts - Part 1: Model for geometrical specification and verification (GB/T 24637.1-2020, ISO 17450-1:2011, MOD)
GB/T 24637.2 Geometrical product specifications (GPS) - General concepts - Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities (GB/T 24637.2-2020, ISO 17450-2:2012, MOD)
GB/T 24637.3 Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced features (GB/T 24637.3-2020, ISO 17450-3:2016, MOD)
GB/T 38762.1 Geometrical product specifications (GPS) - Dimensional tolerancing - Part 1: Linear sizes (GB/T 38762.1-2020, ISO 14405-1:2016, MOD)
GB/T 38762.3 Geometrical product specifications(GPS) - Dimensional tolerancing - Part 3:Angular sizes (GB/T 38762.3-2020，ISO 14405-3:2016, MOD)
ISO 129-1 Technical product documentation (TPD) - Presentation of dimensions and tolerances - Part 1:General principles
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 1182, GB/T 4249, GB/T 19096, GB/T 24637.1, GB/T 24637.2, GB/T 24637.3, GB/T 38762.1, GB/T 38762.3, ISO 129-1 and the following apply.
Note: The term “drawing” is used in this document as a synonym for the 2D drawing, the 3D model and other representations of the workpiece.
3.1
± tolerancing
tolerancing using dimension and indication of limit deviations, dimension limit values or unilateral dimension limit
Note: The sign ± should not be understood in a way that the limit deviations are always symmetrical to the nominal size.
Foreword i
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 sizes
7 Illustrations of ambiguous ± tolerancing v.s. unambiguous geometrical specifications
8 Angular tolerancing
Annex A (Informative) Explanations and examples of the ambiguity caused by using ± tolerances for dimensions other than linear size or angular size
Annex B (Informative) Relation to the GPS matrix model
Bibliography
GB/T 38762.2-2020 Geometrical product specifications(GPS)—Dimensional tolerancing—Part 2:Dimensions other than linear or angular sizes (English Version)
Standard No.
GB/T 38762.2-2020
Status
valid
Language
English
File Format
PDF
Word Count
10500 words
Price(USD)
315.0
Implemented on
2020-11-1
Delivery
via email in 1 business day
Detail of GB/T 38762.2-2020
Standard No.
GB/T 38762.2-2020
English Name
Geometrical product specifications(GPS)—Dimensional tolerancing—Part 2:Dimensions other than linear or angular sizes
Geometrical product specifications (GPS) - Dimensional Tolerancing - Part 2: Dimensions other than linear or angular sizes
1 Scope
This part of GB/T 38762 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 may be indicated by ± tolerancing or geometrical specifications.
The ambiguity caused by using ± tolerances for dimensions other than linear sizes (for individual tolerances and general tolerances according to, e.g.GB/T 1804 and GB/T 6414) 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:
——GB/T 38762.1 for linear size;
——GB/T 38762.3 for angular size;
——ISO 2538-1 and ISO 2538-2 for wedges;
——GB/T 15754 for cones.
Note 3: The rules for geometrical specifications are given in GB/T 1182.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1182 Geometrical product specifications(GPS) - Geometrical tolerancing - Tolerances of form ,orientation, location and run-out (GB/T 1182-2018，ISO 1101:2017, MOD)
GB/T 4249 Geometrical product specifications (GPS) - Fundamentals - Concepts, principles and rules (GB/T 4249-2018, ISO 8015:2011, MOD)
GB/T 19096 Technical drawing-Drawing presentation-Vocabulary and indications for edges of undefined shape (GB/T 19096-2003, ISO 13715-2000, IDT)
GB/T 24637.1 Geometrical product specifications (GPS) - General concepts - Part 1: Model for geometrical specification and verification (GB/T 24637.1-2020, ISO 17450-1:2011, MOD)
GB/T 24637.2 Geometrical product specifications (GPS) - General concepts - Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities (GB/T 24637.2-2020, ISO 17450-2:2012, MOD)
GB/T 24637.3 Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced features (GB/T 24637.3-2020, ISO 17450-3:2016, MOD)
GB/T 38762.1 Geometrical product specifications (GPS) - Dimensional tolerancing - Part 1: Linear sizes (GB/T 38762.1-2020, ISO 14405-1:2016, MOD)
GB/T 38762.3 Geometrical product specifications(GPS) - Dimensional tolerancing - Part 3:Angular sizes (GB/T 38762.3-2020，ISO 14405-3:2016, MOD)
ISO 129-1 Technical product documentation (TPD) - Presentation of dimensions and tolerances - Part 1:General principles
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 1182, GB/T 4249, GB/T 19096, GB/T 24637.1, GB/T 24637.2, GB/T 24637.3, GB/T 38762.1, GB/T 38762.3, ISO 129-1 and the following apply.
Note: The term “drawing” is used in this document as a synonym for the 2D drawing, the 3D model and other representations of the workpiece.
3.1
± tolerancing
tolerancing using dimension and indication of limit deviations, dimension limit values or unilateral dimension limit
Note: The sign ± should not be understood in a way that the limit deviations are always symmetrical to the nominal size.
Contents of GB/T 38762.2-2020
Foreword i
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 sizes
7 Illustrations of ambiguous ± tolerancing v.s. unambiguous geometrical specifications
8 Angular tolerancing
Annex A (Informative) Explanations and examples of the ambiguity caused by using ± tolerances for dimensions other than linear size or angular size
Annex B (Informative) Relation to the GPS matrix model
Bibliography
