| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 10<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4 Symbols <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5 Role of a datum system <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6 General concepts <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7 Graphical language 7.1 General 7.2 Indication of datum features 7.2.1 Datum feature indicator <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 7.2.2 Datum feature identifier 7.2.3 Datum targets 7.2.3.1 General 7.2.3.2 Datum target frame <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 7.2.3.3 Datum target symbol <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 7.2.3.4 Leader line <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 7.2.4 Contacting features <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 7.3 Specification of datums and datum systems 7.4 Indication and meaning of rules 7.4.1 General <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 7.4.2 Rules (potential new clause 8) 7.4.2.1 Rule 1 \u2014 Datum features (established from a single feature) <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 7.4.2.2 Rule 2 \u2014 Datum features established from a complete feature 7.4.2.3 Rule 3 \u2014 Datum features established from a non-complete feature defined by one or more datum targets <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 7.4.2.4 Rule 4 \u2014 Datum system <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 7.4.2.5 Rule 5 \u2014 Indication of a single or common datum in a datum indicator of a datum section <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 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: <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | 7.4.2.6.3 Rule 6.b: dimension of an associated feature <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | 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: <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | 7.4.2.7 Rule 7 \u2014 Locked or released degrees of freedom for the members of its datum system <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | 7.4.2.8 Rule 8 \u2014 Special indications for common datum <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | 7.4.2.9 Rule 9 \u2014 Indications of situation feature on the technical product documentation <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | 7.4.2.10 Rule 10 \u2014 Degrees of freedom indication in relation with a datum system 7.4.2.11 Rule 11 \u2014 Application of modifiers in a datum indicator <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | 7.5.4 Datum filtration specification elements <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | 7.5.5 Datum association specification elements <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | 7.5.6 Drawing-specific default for datum <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | Annex A (normative) Association for datums A.1 Basic concepts <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | A.2 Association methods A.2.1 General <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | A.2.2 Association for single datums A.2.2.1 Association for single datums without the [CF] modifier <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | A.2.2.2 Association for single datums with the modifier [CF] A.2.3 Association for common datums <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | A.2.4 Association for datum systems <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Annex B (informative) Invariance classes <\/td>\n<\/tr>\n | ||||||
| 65<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 66<\/td>\n | C.1.2 Cylinder <\/td>\n<\/tr>\n | ||||||
| 67<\/td>\n | C.1.3 Cone <\/td>\n<\/tr>\n | ||||||
| 68<\/td>\n | C.1.4 Sphere <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | C.1.5 Particular situation feature <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | C.1.6 Obvious situation feature <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | C.1.7 Only one situation feature needed <\/td>\n<\/tr>\n | ||||||
| 72<\/td>\n | C.1.8 Complex surface <\/td>\n<\/tr>\n | ||||||
| 73<\/td>\n | C.1.9 Intersecting planes <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | C.1.10 Two parallel opposite planes (defined as a feature of size) <\/td>\n<\/tr>\n | ||||||
| 75<\/td>\n | C.1.11 Three datum targets on a plane <\/td>\n<\/tr>\n | ||||||
| 76<\/td>\n | C.2 Examples of datum systems constituted by one common datum C.2.1 Two coplanar planes <\/td>\n<\/tr>\n | ||||||
| 77<\/td>\n | C.2.2 Two coaxial cylinders <\/td>\n<\/tr>\n | ||||||
| 78<\/td>\n | C.2.3 Plane and cylinder perpendicular to each other <\/td>\n<\/tr>\n | ||||||
| 79<\/td>\n | C.2.4 Two parallel cylinders <\/td>\n<\/tr>\n | ||||||
| 80<\/td>\n | C.2.5 Pattern of five cylinders <\/td>\n<\/tr>\n | ||||||
| 81<\/td>\n | C.2.6 Two parallel planes <\/td>\n<\/tr>\n | ||||||
| 82<\/td>\n | C.3 Examples of datum systems constituted by more than one single datum C.3.1 Three perpendicular planes <\/td>\n<\/tr>\n | ||||||
| 84<\/td>\n | C.3.2 Perpendicular plane and cylinder <\/td>\n<\/tr>\n | ||||||
| 86<\/td>\n | Annex D (normative) Associated feature established from a thread or a gear D.1 General <\/td>\n<\/tr>\n | ||||||
| 87<\/td>\n | D.2 Indication for a thread <\/td>\n<\/tr>\n | ||||||
| 88<\/td>\n | D.3 Indication for a gear <\/td>\n<\/tr>\n | ||||||
| 92<\/td>\n | Annex E (informative) Examples of a datum system or a common datum established with contacting features E.1 Example 1 <\/td>\n<\/tr>\n | ||||||
| 93<\/td>\n | E.2 Example 2 <\/td>\n<\/tr>\n | ||||||
| 94<\/td>\n | E.3 Example 3 <\/td>\n<\/tr>\n | ||||||
| 95<\/td>\n | E.4 Example 4 <\/td>\n<\/tr>\n | ||||||
| 96<\/td>\n | E.5 Example 5 \u2014 Example for a \u201cthree jaw chuck\u201d <\/td>\n<\/tr>\n | ||||||
| 97<\/td>\n | Annex F (informative) Filter symbols and attached nesting index <\/td>\n<\/tr>\n | ||||||
| 98<\/td>\n | Annex G (informative) Some basic examples of datum G.1 General G.2 Associated plane used to establish a datum <\/td>\n<\/tr>\n | ||||||
| 100<\/td>\n | G.3 Associated circle and cylinder used to establish a datum <\/td>\n<\/tr>\n | ||||||
| 104<\/td>\n | Annex H (normative) Relations and dimensions of graphical symbols <\/td>\n<\/tr>\n | ||||||
| 105<\/td>\n | Annex I (informative) Former practice <\/td>\n<\/tr>\n | ||||||
| 106<\/td>\n | 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 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" BS EN ISO 5459. Geometrical product specifications (GPS). Geometrical tolerancing. Datums and datum systems<\/b><\/p>\n |