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BSI 16/30314605 DC:2016 Edition

BSI 16/30314605 DC:2016 Edition

$24.66

BS EN ISO 5459. Geometrical product specifications (GPS). Geometrical tolerancing. Datums and datum systems

Published By Publication Date Number of Pages
BSI 2016 107
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PDF Catalog

PDF Pages PDF Title
10 1 Scope
2 Normative references
3 Terms and definitions
16 4 Symbols
17 5 Role of a datum system
18 6 General concepts
21 7 Graphical language
7.1 General
7.2 Indication of datum features
7.2.1 Datum feature indicator
22 7.2.2 Datum feature identifier
7.2.3 Datum targets
7.2.3.1 General
7.2.3.2 Datum target frame
23 7.2.3.3 Datum target symbol
24 7.2.3.4 Leader line
25 7.2.4 Contacting features
26 7.3 Specification of datums and datum systems
7.4 Indication and meaning of rules
7.4.1 General
27 7.4.2 Rules (potential new clause 8)
7.4.2.1 Rule 1 — Datum features (established from a single feature)
29 7.4.2.2 Rule 2 — Datum features established from a complete feature
7.4.2.3 Rule 3 — Datum features established from a non-complete feature defined by one or more datum targets
36 7.4.2.4 Rule 4 — Datum system
37 7.4.2.5 Rule 5 — Indication of a single or common datum in a datum indicator of a datum section
38 7.4.2.6 Rules 6 for associated features
7.4.2.6.1 General
The associated feature is established from the datum feature after filtration, by association of an ideal feature (associated feature) with a non-ideal feature (datum feature).
The association criteria combines an objective function and constraint (material constraint, size, orientation, location)
The association is defined by several properties:
39 This standard defines default objective functions and default filtration criteria. It is possible to change them for an individual specification or globally for a drawing, by defining special operators (see 7.5).
7.4.2.6.2 Rule 6.a: associated feature type
40 7.4.2.6.3 Rule 6.b: dimension of an associated feature
41 7.4.2.6.4 Rule 6.c: material constraints for associated feature
7.4.2.6.5 Rule 6.d: constraint between associated features in a common datum
42 7.4.2.6.6 Rule 6.e: constraint between associated features in a datum system
When a single datum or a common datum is indicated as a primary datum (see examples 1 to 4), then no additional constraint in orientation shall be taken into account in the association.
When a single datum or a common datum is indicated as a secondary datum (see examples 2 and 3), then rules 6.a, 6.b and 6.c shall be considered with additional constraints to establish the secondary datum from associated feature(s):
When a single datum or a common datum is indicated as a tertiary datum (see example 4), then rule 6.a, 6.b and 6.c shall be considered with additional constraints:
46 7.4.2.7 Rule 7 — Locked or released degrees of freedom for the members of its datum system
48 7.4.2.8 Rule 8 — Special indications for common datum
49 7.4.2.9 Rule 9 — Indications of situation feature on the technical product documentation
50 7.4.2.10 Rule 10 — Degrees of freedom indication in relation with a datum system
7.4.2.11 Rule 11 — Application of modifiers in a datum indicator
52 7.5 Datum section (potential new clause 9)
7.5.1 General
7.5.2 ISO default specification operator for single or common datum
7.5.3 Individual specification operator for single or common datum
53 7.5.4 Datum filtration specification elements
54 7.5.5 Datum association specification elements
55 7.5.6 Drawing-specific default for datum
56 Annex A (normative) Association for datums
A.1 Basic concepts
57 A.2 Association methods
A.2.1 General
59 A.2.2 Association for single datums
A.2.2.1 Association for single datums without the [CF] modifier
60 A.2.2.2 Association for single datums with the modifier [CF]
A.2.3 Association for common datums
62 A.2.4 Association for datum systems
63 Annex B (informative) Invariance classes
65 Annex C (informative) Indication and meaning of datum systems for some examples
C.1 Examples of datum systems constituted by one single datum
C.1.1 Plane
66 C.1.2 Cylinder
67 C.1.3 Cone
68 C.1.4 Sphere
69 C.1.5 Particular situation feature
70 C.1.6 Obvious situation feature
71 C.1.7 Only one situation feature needed
72 C.1.8 Complex surface
73 C.1.9 Intersecting planes
74 C.1.10 Two parallel opposite planes (defined as a feature of size)
75 C.1.11 Three datum targets on a plane
76 C.2 Examples of datum systems constituted by one common datum
C.2.1 Two coplanar planes
77 C.2.2 Two coaxial cylinders
78 C.2.3 Plane and cylinder perpendicular to each other
79 C.2.4 Two parallel cylinders
80 C.2.5 Pattern of five cylinders
81 C.2.6 Two parallel planes
82 C.3 Examples of datum systems constituted by more than one single datum
C.3.1 Three perpendicular planes
84 C.3.2 Perpendicular plane and cylinder
86 Annex D (normative) Associated feature established from a thread or a gear
D.1 General
87 D.2 Indication for a thread
88 D.3 Indication for a gear
92 Annex E (informative) Examples of a datum system or a common datum established with contacting features
E.1 Example 1
93 E.2 Example 2
94 E.3 Example 3
95 E.4 Example 4
96 E.5 Example 5 — Example for a “three jaw chuck”
97 Annex F (informative) Filter symbols and attached nesting index
98 Annex G (informative) Some basic examples of datum
G.1 General
G.2 Associated plane used to establish a datum
100 G.3 Associated circle and cylinder used to establish a datum
104 Annex H (normative) Relations and dimensions of graphical symbols
105 Annex I (informative) Former practice
106 Annex J (informative) Relationship to the GPS matrix model
J.1 General
J.2 Information about this International Standard and its use
J.3 Position in the GPS matrix model
J.4 Related International Standards

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