Geometrical product specifications (GPS) - Dimensional tolerancing -
Part 1: Linear sizes
1 Scope
This part of GB/T 38762 establishes the default specification operator (see GB/T 24637.2) for linear size and defines a number of special specification operators for linear size for features of size, e.g. “cylinder”, “sphere”, “torus,”1), “two parallel opposite planes”, or “two parallel opposite straight lines”. It also defines the specification modifiers and the drawing indications for these linear sizes.
This part covers the following linear sizes:
a) local size:
——two-point size;
——spherical size;
——section size;
——portion size.
b) global size:
——direct global linear size;
——least-squares size;
——maximum inscribed size;
——minimum circumscribed size;
——minimax size;
——indirect global linear size.
c) calculated size:
——circumference diameter;
——area diameter;
——volume diameter.
d) rank-order size:
——maximum size;
——minimum size;
——average size;
——median size;
——mid-range size;
——range of sizes;
——standard deviation of sizes.
This part defines tolerances of linear sizes with or without modifiers (see Tables 1 and 2) for the following:
——+/- limit deviation (e.g. 0/-0.019) (see Figure 11);
——an upper limit of size (ULS)/lower limit of size (LLS) (e.g. 15.2 max., 12 min., or 30.2/30.181) (see Figure 13);
——an ISO tolerance class code in accordance with GB/T 1800.1 (e.g. 10 h6) (see Figure 12).
This part provides a set of tools to express several types of size characteristic. It does not present any information on the relationship between a function and a size characteristic.
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 1800.1 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1:Basis of tolerances, deviations and fits (GB/T 1800.1-2020; ISO 286-1: 2010, MOD)
GB/T 4249 Geometrical product specifications (GPS) – Fundamentals - Concepts, principles and rules (GB/T 4249-2018; ISO 8015: 2011, MOD)
GB/T 16901.1 Rules for the presentation of graphical symbols for use in technical product documentation－Part 1: Basic rules (GB/T 16901.1-2008; ISO 81714-1: 1999, MOD)
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 24637.2-2020 Geometrical product specifications (GPS) - General concepts - Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities (ISO 17450-2: 2012, MOD)
GB/T 24637.3 Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced features (GB/T 2463 7.3-2020; ISO 17450-3: 2016, MOD)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 1800.1, GB/T 4249, GB/T 24637.1, GB/T 24637.2 and GB/T 24637.3 as well as the following apply.
3.1
feature of size
feature of linear size or feature of angular size
Notes:
1 Feature of linear size and feature of angular size are synonyms of linear feature of size and angular feature of size, respectively
2 Figures 1 and 2 illustrate a linear feature of size, type cylinder, or two parallel opposite planes.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Specification modifiers and symbols
5 Default specification operator for size
6 Drawing indication for special specification operators for size
7 Indication of the toleranced feature on which the size characteristic is defined
8 Complementary indication
Annex A (Normative) Proportions and dimensions of symbols
Annex B (Informative) Overview diagram for sizes
Annex C (Informative) Data handling with rank-order modifiers
Annex D (Normative) Size characteristics
Annex E (Normative) Drawing rules for location and indication of the size specification
Annex F (Informative) Relation to the GPS matrix model
Bibliography
Geometrical product specifications (GPS) - Dimensional tolerancing -
Part 1: Linear sizes
1 Scope
This part of GB/T 38762 establishes the default specification operator (see GB/T 24637.2) for linear size and defines a number of special specification operators for linear size for features of size, e.g. “cylinder”, “sphere”, “torus,”1), “two parallel opposite planes”, or “two parallel opposite straight lines”. It also defines the specification modifiers and the drawing indications for these linear sizes.
This part covers the following linear sizes:
a) local size:
——two-point size;
——spherical size;
——section size;
——portion size.
b) global size:
——direct global linear size;
——least-squares size;
——maximum inscribed size;
——minimum circumscribed size;
——minimax size;
——indirect global linear size.
c) calculated size:
——circumference diameter;
——area diameter;
——volume diameter.
d) rank-order size:
——maximum size;
——minimum size;
——average size;
——median size;
——mid-range size;
——range of sizes;
——standard deviation of sizes.
This part defines tolerances of linear sizes with or without modifiers (see Tables 1 and 2) for the following:
——+/- limit deviation (e.g. 0/-0.019) (see Figure 11);
——an upper limit of size (ULS)/lower limit of size (LLS) (e.g. 15.2 max., 12 min., or 30.2/30.181) (see Figure 13);
——an ISO tolerance class code in accordance with GB/T 1800.1 (e.g. 10 h6) (see Figure 12).
This part provides a set of tools to express several types of size characteristic. It does not present any information on the relationship between a function and a size characteristic.
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 1800.1 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1:Basis of tolerances, deviations and fits (GB/T 1800.1-2020; ISO 286-1: 2010, MOD)
GB/T 4249 Geometrical product specifications (GPS) – Fundamentals - Concepts, principles and rules (GB/T 4249-2018; ISO 8015: 2011, MOD)
GB/T 16901.1 Rules for the presentation of graphical symbols for use in technical product documentation－Part 1: Basic rules (GB/T 16901.1-2008; ISO 81714-1: 1999, MOD)
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 24637.2-2020 Geometrical product specifications (GPS) - General concepts - Part 2: Basic tenets, specifications, operators, uncertainties and ambiguities (ISO 17450-2: 2012, MOD)
GB/T 24637.3 Geometrical product specifications (GPS) - General concepts - Part 3: Toleranced features (GB/T 2463 7.3-2020; ISO 17450-3: 2016, MOD)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 1800.1, GB/T 4249, GB/T 24637.1, GB/T 24637.2 and GB/T 24637.3 as well as the following apply.
3.1
feature of size
feature of linear size or feature of angular size
Notes:
1 Feature of linear size and feature of angular size are synonyms of linear feature of size and angular feature of size, respectively
2 Figures 1 and 2 illustrate a linear feature of size, type cylinder, or two parallel opposite planes.
Contents of GB/T 38762.1-2020
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Specification modifiers and symbols
5 Default specification operator for size
6 Drawing indication for special specification operators for size
7 Indication of the toleranced feature on which the size characteristic is defined
8 Complementary indication
Annex A (Normative) Proportions and dimensions of symbols
Annex B (Informative) Overview diagram for sizes
Annex C (Informative) Data handling with rank-order modifiers
Annex D (Normative) Size characteristics
Annex E (Normative) Drawing rules for location and indication of the size specification
Annex F (Informative) Relation to the GPS matrix model
Bibliography
