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BS 8888:2006

BS 8888:2006

$215.11

Technical product specification (TPS). Specification

Published By Publication Date Number of Pages
BSI 2006 96
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PDF Catalog

PDF Pages PDF Title
3 Contents
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
4 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
5 Foreword
6 GPS Relevance symbol
7 1 Scope
2 References
2.1 Normative references
2.2 Informative references
8 3 Terms and definitions
3.1 date of acceptance
3.2 geometrical product specification GPS
3.3 technical product document TPD
3.4 technical product specification TPS
9 4 Global standards underpinning BS 8888
4.1 Introduction
4.2 The fundamental TPS principles
4.2.1 Introduction
10 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
11 4.2.7 The uncertainty in conformance principle
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
12 6 Types of documentation
6.1 General
6.2 Presentation media
6.2.1 General
13 6.2.2 Application of BS ISO 7200:2004
6.2.3 Format
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
14 Figure 1 Metric reference graduations
6.3 Combined drawing
6.4 Diagram
6.5 Document list – Drawing list
7 Scales
15 8 Lines, arrows and terminators
8.1 Lines and terminators
8.2 Lines, terminators and origin indicators
9 Lettering
9.1 General
16 9.2 Notes
10 Projections
11 Views
11.1 General
17 11.2 Auxiliary views
Figure 2 Auxiliary view showing true shape of inclined surface
12 Sections
13 Symbols and abbreviations
13.1 General
18 13.2 Standard symbols and abbreviations
19 14 Representation of features
20 15 Representation of components
15.1 General
21 15.2 Representation of moulded, cast and forged components
22 16 Dimensioning and tolerancing
16.1 Interpretations of limits of size for the control of form
16.1.1 General
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
23 Figure 3 Interpretations using the principle of independency for a cylindrical component for which a tolerance of size only is given on the drawing
24 16.1.3 Limits of size with mutual dependency of size and form
25 Figure 4 Interpretation of limits of size with dependency of size and form
16.2 General
27 16.3 Presentation of decimals
16.3.1 Decimal marker
16.3.2 Non-indicated decimals in tolerances
16.4 Keyways
Figure 5 Dimensioning of keyways
28 16.5 Screw threads
16.6 Methods of specifying tolerances
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
Figure 6 Examples of general tolerance notes
29 17 Geometrical tolerancing
17.1 General
18 Surface texture indication
30 19 Graphical representation and annotation of 3D data (3D modelling output)
31 20 Security
20.1 Introduction
20.2 General security
20.3 Enhanced security
20.4 Security level identification
21 Storage and retrieval
32 22 Marking
22.1 BS 8888
22.2 BS 8888 (enhanced security)
22.3 Tolerancing system
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
33 23 Protection notices
34 Annex A (normative) Normative references
Table A.1 Normative references
35 Table A.1 Normative references (continued)
36 Table A.1 Normative references (continued)
37 Table A.1 Normative references (continued)
38 Table A.1 Normative references (continued)
39 Table A.1 Normative references (continued)
40 Table A.1 Normative references (continued)
41 Table A.1 Normative references (continued)
42 Table A.1 Normative references (continued)
43 Table A.1 Normative references (continued)
44 Table A.1 Normative references (continued)
45 Table A.1 Normative references (continued)
46 Table A.1 Normative references (continued)
47 Table A.1 Normative references (continued)
48 Table A.1 Normative references (continued)
49 Table A.1 Normative references (continued)
50 Table A.1 Normative references (continued)
51 Table A.1 Normative references (continued)
52 Table A.1 Normative references (continued)
53 Table A.1 Normative references (continued)
54 Table A.1 Normative references (continued)
55 Table A.1 Normative references (continued)
56 Table A.1 Normative references (continued)
57 Annex B (informative) Informative references
Table B.1 Informative references
58 Table B.1 Informative references (continued)
Annex C (normative) Document security – Enhanced
C.1 Introduction
C.2 Identification of security classification
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.
59 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)
D.1 Introduction
D.2 Applicability of standards
60 D.3 Exclusion of surface texture
D.4 Definition of datums
D.5 Size requirements
61 D.6 Tolerancing principle
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
62 D.8 Tolerance characteristics
63 Annex E (informative) BS ISO 1101:1984 to BS ISO 1101:2004 – The evolution
E.1 Revision of BS ISO 1101:1984
E.2 BS ISO 1101:2004, Amendment 1
64 Figure E.1 Indication of orientation of the tolerance zone
65 Figure E.2 Use of the median feature
66 Figure E.3 Restricted parts of a feature
Figure E.4 Example of a common tolerance zone
67 Figure E.5 Example of a common tolerance zone
Figure E.6 Examples of the use of the “all around” symbol
68 Figure E.7 Unequally disposed tolerance zone indicator
69 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
70 Figure E.10 Indicating a common set of toleranced features
Figure E.11 Indicating a common compound tolerance zone
71 Table 3 Toleranced feature with the projected tolerance modifier
72 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
73 Figure E.15 Example of indirect indication of a projected tolerance with an offset
74 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
75 Annex F (informative) Technical product specification – Geometrical product specification (GPS)
F.1 Introduction
76 F.2 Key concepts
F.2.1 Different worlds or models
Figure F.1 Model of the relationship between specification, verification and the actual workpiece
77 F.2.2 Specification and verification
Figure F.2 The link between design intent and metrology
78 F.2.3 The operator principle and the duality principle
79 Figure F.3 The duality principle
80 F.2.4 The default principle
81 F.3 Uncertainty
F.3.1 Introduction
F.3.2 Correlation uncertainty
F.3.3 Specification uncertainty
82 F.3.4 Measurement uncertainty (attributed to the metrologist)
F.3.5 Making use of uncertainty
F.4 The GPS standards matrix
84 Figure F.4 The GPS matrix model
85 Annex G (informative) Technical product realization – UK development
G.1 BS 8888 – Rationale
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.
86 G.2 Technical product documentation
87 Figure G.1 The relationship between the elements of a technical drawing
G.3 Technical product realization – The TPR concept.
89 Figure G.2 Schematic of the TPR triumvirate
Figure G.3 Technical product realization
90 Annex H (informative) Index of choices and defaults for BS 8888:2006

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BS 8888:2006
$215.11