ISO-8015:2011 pdf free download – Geometrical product specifications (GPS)一 Fundamentals一Concepts, principles and rules (ISO 8015:2011).
5.12 General specification principle
General GPS specifications apply individually to each characteristic for each feature and to each characteristic for each relationship between features for which no individual GPS specification of the same type has been indicated. General GPS specifications are considered as a set of specifications unless otherwise specified and apply to each characteristic for each feature and to each characteristic for each relationship between features individually.
If no general GPS specifications are indicated in or near the title block, then only the individual GPS specifications indicated in the technical product documentation apply.
If more than one general GPS specification is indicated in or near the title block and these specifications are contradictory, they shall be supplemented with an explanation to make it clear to which characteristics each general GPS specification applies to avoid ambiguities in the specification.
In the case of contradictory general GPS specifications, i.e. two or more general GPS specifications for the same characteristic, the general rules for ambiguity of the specification only require compliance with one general GPS specification, i.e. the most permissive one.
NOTE 1 An individual GPS specification can be more or less restrictive than the general GPS specification indicated in the drawing.
NOTE 2 For example, ISO 1302, ISO 2768 and ISO 13715 provide tools for indicating general tolerances.
5.13 Responsibility principle
Given the duality principle and the functional control principle, it is necessary to describe the closeness of a specification operator to the functional operator and the closeness of a verification operator to a specification operator. The ambiguity of the description of the function and the ambiguity of the specification together describe the closeness of the specification operator to the functional operator. These ambiguities are the responsibility of the designer. The measurement uncertainty quantifies the closeness of the verification operator to the specification operator. Unless otherwise stated, the measurement uncertainty is the responsibility of the party who is providing proof of conformance or non-conformance with a specification; see
ISO 14253-1.
6 Rules for indication of default specification operators
6.1 General
Default GPS specifications are generally used to simplify the tolerancing on technical drawings. A default specification operator can be specified in one of two ways, by indicating either a general ISO default GPS specification, or a general altered default GPS specification.
Operations not having complementary requirements assigned in the indicated special specification operator remain as defined by the default specification according to the ISO basic specification.
NOTE 2 Currently, ISO GPS standards do not provide defaults for all specification operations in all specification operators. Consequently, many ISO basic specifications are not complete.
The technique described in 7.2 shall be applied for indication of special specification operators for both features toleranced individually in accordance with ISO 1101, ISO 1302, ISO 5459, etc., and
— drawing unique default specifications.
7.2 Added complementary information (requirements) to the ISO basic specification
Added complementary information (requirements) to the ISO basic specification may change the default operations of ISO basic specification where needed. Examples of this information are
a) association rule,
b) filter type,
c) transmission band,
d) stylus tip, and
e) extraction strategy.
When changing any of these default operations to the specific need of the design, the ISO basic specification shall be modified as follows:
— in the case of an ISO 1101 specification, by adding information to the second compartment of the tolerance indicator;
— in the case of an ISO 1302 specification, by adding information in areas a-e of the complete graphical symbol for surface texture;
— in the case of an ISO 14405-1 specification, by adding modifiers to the tolerance indication.
See the respective International Standards for details.
NOTE Currently, ISO GPS standards do not define all the necessary specification modifiers.