BS EN ISO 5459:2011
$215.11
Geometrical product specifications (GPS). Geometrical tolerancing. Datums and datum systems
Published By | Publication Date | Number of Pages |
BSI | 2011 | 92 |
This International Standard specifies terminology, rules and methodology for the indication and understanding of datums and datum systems in technical product documentation. This International Standard also provides explanations to assist the user in understanding the concepts involved.
This International Standard defines the specification operator (see ISO 17450-2) used to establish a datum or datum system. The verification operator (see ISO 17450-2) can take different forms (physically or mathematically) and is not the subject of this International Standard.
NOTE The detailed rules for maximum and least material requirements for datums are given in ISO 2692.
PDF Catalog
PDF Pages | PDF Title |
---|---|
9 | Scope Normative references |
10 | Terms and definitions |
14 | Symbols |
15 | Role of datums |
17 | General concepts General |
18 | Intrinsic characteristics of surfaces associated with datum General A single datum established from a single feature Common datum established from two or more single features si |
20 | Datum systems established in a defined sequence from two or Single datums, common datums and datum systems General Single datums |
22 | Common datums Datum systems |
25 | Graphical language General Indication of datum features Datum feature indicator |
26 | Datum feature identifier Datum targets General Datum target frame |
27 | Datum target symbol Leader line |
29 | Specification of datums and datum systems Indication and meaning of rules General |
30 | Rules Rule 1 ā Datum features (established from a single feature) |
32 | Rule 2 ā Associated features of size with fixed or variable Rule 3 ā Datum features established from a complete feature |
33 | Rule 4 ā Datum features established from one or more datum t |
37 | Rule 5 ā Associated feature with a different type than the n |
40 | Rule 6 ā Tolerance frame layout with a datum or a datum syst |
41 | Rule 7 ā Indication of a single or common datum in a compart |
42 | Rule 8 ā Locked or released degrees of freedom from a datum |
43 | Rule 9 ā Special indications for common datum Rule 10 ā Application of geometrical modifiers in a toleranc |