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BS 8888:2006 Technical product specification (TPS). Specification, 2006
- Contents [Go to Page]
- 1 Scope 1
- 2 References 1
- 3 Terms and definitions 2
- 4 Global standards underpinning BS 8888 3
- 5 Expression of the concept 5
- 6 Types of documentation 6
- 7 Scales 8
- 8 Lines, arrows and terminators 9
- 9 Lettering 9
- 10 Projections 10
- 11 Views 10
- 12 Sections 11
- 13 Symbols and abbreviations 11
- 14 Representation of features 13
- 15 Representation of components 14
- 16 Dimensioning and tolerancing 16
- 17 Geometrical tolerancing 23
- 18 Surface texture indication 23
- 19 Graphical representation and annotation of 3-D data (3-D modelling output) 24
- 20 Security 25
- 21 Storage and retrieval 25
- 22 Marking 26
- 23 Protection notices 27
- Annexes
- Annex A (normative) Normative references 28
- Annex B (informative) Informative references 51
- Annex C (normative) Document security - Enhanced 52
- Annex D (informative) Key differences between BS 8888 geometrical tolerancing and ASME Y14.5 geometric dimensioning and tolerancing (GD&T) 53
- Annex E (informative) BS ISO 1101:1984 to BS ISO 1101:2004 - The evolution 57
- Annex F (informative) Technical product specification - Geometrical product specification (GPS) 69
- Annex G (informative) Technical product realization - UK development 79
- Annex H (informative) Index of choices and defaults for BS 8888:2006 84
- List of figures
- Figure 1 - Metric reference graduations 8
- Figure 2 - Auxiliary view showing true shape of inclined surface 11
- Figure 3 - Interpretations using the principle of independency for a cylindrical component for which a tolerance of size only is given on the drawing 17
- Figure 4 - Interpretation of limits of size with dependency of size and form 19
- Figure 5 - Dimensioning of keyways 21
- Figure 6 - Examples of general tolerance notes 22
- Figure 7 - Method of indicating that the independency system of tolerancing has been used 26
- Figure 8 - Method of indicating that the dependency system of tolerancing has been used 26
- Figure E.1 - Indication of orientation of the tolerance zone 58
- Figure E.2 - Use of the median feature 59
- Figure E.3 - Restricted parts of a feature 60
- Figure E.4 - Example of a common tolerance zone 60
- Figure E.5 - Example of a common tolerance zone 61
- Figure E.6 - Examples of the use of the “all around” symbol 61
- Figure E.7 - Unequally disposed tolerance zone indicator 62
- Figure E.8 - Example of the use of the compound toleranced feature 63
- Figure E.9 - Indicating the start and end of the compound toleranced feature 63
- Figure E.10 - Indicating a common set of toleranced features 64
- Figure E.11 - Indicating a common compound tolerance zone 64
- Figure E.12 - Two different ways of indicating a GPS with projected tolerance modifier 66
- Figure E.13 - Explanation of the direction of the extended feature 66
- Figure E.14 - Example of direct indication of a projected tolerance with an offset 66
- Figure E.15 - Example of indirect indication of a projected tolerance with an offset 67
- Figure E.16 - Example of the use of projected tolerance zone together with the median modifier 68
- Figure E.17 - Example of the use of projected tolerance zone together with a common zone modifier 68
- Figure F.1 - Model of the relationship between specification, verification and the actual workpiece 70
- Figure F.2 - The link between design intent and metrology 71
- Figure F.3 - The duality principle 73
- Figure F.4 - The GPS matrix model 78
- Figure G.1 - The relationship between the elements of a technical drawing 81
- Figure G.2 - Schematic of the TPR triumvirate 83
- Figure G.3 - Technical product realization 83
- List of tables
- Table A.1 - Normative references 28
- Table B.1 - Informative references 51
- Foreword [Go to Page]
- GPS Relevance symbol
- 1 Scope
- 2 References [Go to Page]
- 2.1 Normative references
- 2.2 Informative references
- 3 Terms and definitions [Go to Page]
- 3.1 date of acceptance
- 3.2 geometrical product specification GPS
- 3.3 technical product document TPD
- 3.4 technical product specification TPS
- 4 Global standards underpinning BS 8888 [Go to Page]
- 4.1 Introduction
- 4.2 The fundamental TPS principles [Go to Page]
- 4.2.1 Introduction
- 4.2.2 The operator principle
- 4.2.3 The duality principle
- 4.2.4 The TPS at its acceptance date is definitive, principle.
- 4.2.5 The default principle
- 4.2.6 The reference condition principle
- 4.2.7 The uncertainty in conformance principle [Go to Page]
- a) specification uncertainty (attributed to the designer);
- b) correlation uncertainty (attributed to the designer); and
- c) measurement uncertainty (attributed to the metrologist).
- 5 Expression of the concept
- 6 Types of documentation [Go to Page]
- 6.1 General
- 6.2 Presentation media [Go to Page]
- 6.2.1 General
- 6.2.2 Application of BS ISO 7200:2004
- 6.2.3 Format [Go to Page]
- a) landscape: intended to be viewed with the longest side of the sheet horizontal;
- b) portrait: intended to be viewed with the longest side of the sheet vertical.
- 6.2.4 Metric reference graduation [Go to Page]
- Figure 1 Metric reference graduations
- 6.3 Combined drawing
- 6.4 Diagram
- 6.5 Document list - Drawing list
- 7 Scales
- 8 Lines, arrows and terminators [Go to Page]
- 8.1 Lines and terminators
- 8.2 Lines, terminators and origin indicators
- 9 Lettering [Go to Page]
- 9.1 General
- 9.2 Notes
- 10 Projections
- 11 Views [Go to Page]
- 11.1 General
- 11.2 Auxiliary views [Go to Page]
- Figure 2 Auxiliary view showing true shape of inclined surface
- 12 Sections
- 13 Symbols and abbreviations [Go to Page]
- 13.1 General
- 13.2 Standard symbols and abbreviations
- 14 Representation of features
- 15 Representation of components [Go to Page]
- 15.1 General
- 15.2 Representation of moulded, cast and forged components
- 16 Dimensioning and tolerancing [Go to Page]
- 16.1 Interpretations of limits of size for the control of form [Go to Page]
- 16.1.1 General [Go to Page]
- a) the principle of independency of size and form, where the limits of size are intended to exercise control only over the size of the feature-of-size, and not to exercise any control over its form; or
- b) the principle of dependency of size and form, where the limits of size are intended to exercise control over the form of the feature-of-size as well as its size.
- 16.1.2 Limits of size with independency of size and form [Go to Page]
- Figure 3 Interpretations using the principle of independency for a cylindrical component for which a tolerance of size only is given on the drawing
- 16.1.3 Limits of size with mutual dependency of size and form [Go to Page]
- Figure 4 Interpretation of limits of size with dependency of size and form
- 16.2 General
- 16.3 Presentation of decimals [Go to Page]
- 16.3.1 Decimal marker
- 16.3.2 Non-indicated decimals in tolerances
- 16.4 Keyways [Go to Page]
- Figure 5 Dimensioning of keyways
- 16.5 Screw threads
- 16.6 Methods of specifying tolerances [Go to Page]
- a) separate indication on the drawing;
- b) reference to general tolerances noted on the drawing;
- c) reference to a standard containing general tolerances;
- d) reference to other documents.
- 16.7 General tolerancing [Go to Page]
- Figure 6 Examples of general tolerance notes
- 17 Geometrical tolerancing [Go to Page]
- 17.1 General
- 18 Surface texture indication
- 19 Graphical representation and annotation of 3D data (3D modelling output)
- 20 Security [Go to Page]
- 20.1 Introduction
- 20.2 General security
- 20.3 Enhanced security
- 20.4 Security level identification
- 21 Storage and retrieval
- 22 Marking [Go to Page]
- 22.1 BS 8888
- 22.2 BS 8888 (enhanced security)
- 22.3 Tolerancing system [Go to Page]
- Figure 7 Method of indicating that the independency system of tolerancing has been used
- Figure 8 Method of indicating that the dependency system of tolerancing has been used
- 23 Protection notices
- Annex A (normative) Normative references [Go to Page]
- Table A.1 Normative references
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Table A.1 Normative references (continued)
- Annex B (informative) Informative references [Go to Page]
- Table B.1 Informative references
- Table B.1 Informative references (continued)
- Annex C (normative) Document security - Enhanced [Go to Page]
- C.1 Introduction
- C.2 Identification of security classification [Go to Page]
- a) larger than the largest text used in the TPS; or
- b) bolder and the same size as the largest text used in the TPS.
- C.3 Marking for enhanced security
- Annex D (informative) Key differences between BS 8888 geometrical tolerancing and ASME Y14.5 geometric dimensioning and tolerancing (GD&T) [Go to Page]
- D.1 Introduction
- D.2 Applicability of standards
- D.3 Exclusion of surface texture
- D.4 Definition of datums
- D.5 Size requirements
- D.6 Tolerancing principle [Go to Page]
- 2) It does not apply to flexible parts subject to free state variation in the unrestrained condition.
- 3) It does not apply to features-of-size which have a straightness tolerance applied to their axes or median planes (by implicat...
- 4) It may be overruled where a feature-of-size has a specified relationship between size and geometrical tolerances (by use of the m or l modifier in the geometrical tolerance).
- 5) It may be overruled with a statement such as “PERFECT FORM AT MMC NOT REQD” placed by a feature-of-size.
- D.7 Features-of-size
- D.8 Tolerance characteristics
- Annex E (informative) BS ISO 1101:1984 to BS ISO 1101:2004 - The evolution [Go to Page]
- E.1 Revision of BS ISO 1101:1984
- E.2 BS ISO 1101:2004, Amendment 1 [Go to Page]
- Figure E.1 Indication of orientation of the tolerance zone
- Figure E.2 Use of the median feature
- Figure E.3 Restricted parts of a feature
- Figure E.4 Example of a common tolerance zone
- Figure E.5 Example of a common tolerance zone
- Figure E.6 Examples of the use of the “all around” symbol
- Figure E.7 Unequally disposed tolerance zone indicator
- Figure E.8 Example of the use of the compound toleranced feature
- Figure E.9 Indicating the start and end of the compound toleranced feature
- Figure E.10 Indicating a common set of toleranced features
- Figure E.11 Indicating a common compound tolerance zone [Go to Page]
- Table 3 Toleranced feature with the projected tolerance modifier
- Figure E.12 Two different ways of indicating a GPS with projected tolerance modifier
- Figure E.13 Explanation of the direction of the extended feature
- Figure E.14 Example of direct indication of a projected tolerance with an offset
- Figure E.15 Example of indirect indication of a projected tolerance with an offset
- Figure E.16 Example of the use of projected tolerance zone together with the median modifier
- Figure E.17 Example of the use of projected tolerance zone together with a common zone modifier
- Annex F (informative) Technical product specification - Geometrical product specification (GPS) [Go to Page]
- F.1 Introduction
- F.2 Key concepts [Go to Page]
- F.2.1 Different worlds or models [Go to Page]
- Figure F.1 Model of the relationship between specification, verification and the actual workpiece
- F.2.2 Specification and verification [Go to Page]
- Figure F.2 The link between design intent and metrology
- F.2.3 The operator principle and the duality principle [Go to Page]
- Figure F.3 The duality principle
- F.2.4 The default principle
- F.3 Uncertainty [Go to Page]
- F.3.1 Introduction
- F.3.2 Correlation uncertainty
- F.3.3 Specification uncertainty
- F.3.4 Measurement uncertainty (attributed to the metrologist)
- F.3.5 Making use of uncertainty
- F.4 The GPS standards matrix [Go to Page]
- Figure F.4 The GPS matrix model
- Annex G (informative) Technical product realization - UK development [Go to Page]
- G.1 BS 8888 - Rationale [Go to Page]
- a) methodology for design implementation;
- b) geometrical product specification;
- c) graphical representation (engineering drawings/diagrams and 3D modelling);
- d) verification (metrology and precision measurement);
- e) technical documentation;
- f) electronic formats and controls;
- g) related tools and equipment.
- G.2 Technical product documentation [Go to Page]
- Figure G.1 The relationship between the elements of a technical drawing
- G.3 Technical product realization - The TPR concept. [Go to Page]
- Figure G.2 Schematic of the TPR triumvirate
- Figure G.3 Technical product realization
- Annex H (informative) Index of choices and defaults for BS 8888:2006 [Go to Page]
