The processes of manufacture and assembly are based on the communication of engineering information via drawing. These drawings follow rules laid down in national and international standards. The organisation responsible for the international rules is the International Standards Organisation (ISO). There are hundreds of ISO standards on engineering drawing because drawing is very complicated and accurate transfer of information must be guaranteed. The information contained in an engineering drawing is a legal specification, which contractor and sub-contractor agree to in a binding contract. The ISO standards are designed to be independent of any one language and thus much symbology is used to overcome any reliance on any language. Companies can only operate efficiently if they can guarantee the correct transmission of engineering design information for manufacturing and assembly.This book is a short introduction to the subject of engineering drawing for manufacture. It should be noted that standards are updated on a 5-year rolling programme and therefore students of engineering drawing need to be aware of the latest standards. This book is unique in that it introduces the subject of engineering drawing in the context of standards.
Author(s): Brian Griffiths
Year: 2002
Language: English
Pages: 150
Front Cover......Page 1
Engineering Drawing for Manufacture......Page 4
Copyright Page......Page 5
Contents......Page 6
Introduction......Page 10
List of Symbols......Page 12
List of Abbreviations......Page 14
1.0 Introduction......Page 16
1.1 Technical Product Documentation......Page 17
1.2 The much-loved BS 308......Page 18
1.3 Drawing as a language......Page 19
1.4 The danger of visual illusions......Page 21
1.5 Representation, visualization and specification......Page 24
1.6 Requirements of engineering drawings......Page 27
1.7 Manual and machine drawing......Page 33
References and further reading......Page 36
2.0 Introduction......Page 38
2.1 Perspective projection......Page 39
2.2 Axonometric projection......Page 40
2.3 Isometric projection......Page 42
2.4 Oblique projection......Page 44
2.5 Orthographic projection......Page 46
2.6 Why are first and third angle projections so named?......Page 53
2.7 Sectional views......Page 54
2.8 Number of views......Page 56
References and further reading......Page 58
3.1 Example of drawing a small hand vice......Page 59
3.2 Line types and thicknesses......Page 62
3.3 Sectioning or cross-hatching lines......Page 68
3.5 Dimension lines......Page 69
3.7 Lettering, symbols and abbreviations......Page 72
3.8 Representation of common parts and features......Page 73
3.9 Item references and lists......Page 76
3.11 Draughtman’s licence......Page 77
References and further reading......Page 78
4.1 Dimension definitions......Page 80
4.2 Types of dimensioning......Page 83
4.3 Symbology......Page 89
4.4 Variation of features......Page 93
4.5 Tolerancing dimensions......Page 96
4.7 The implications of tolerances for design......Page 99
4.8 Manufacturing variability and tolerances......Page 101
References and further reading......Page 102
5.1 Relationship to functional performance......Page 103
5.2 Relationship to manufacturing processes......Page 105
5.3 ISO tolerance ranges......Page 107
5.4 Limits and fits......Page 109
5.5 Geometry and tolerances......Page 115
5.6 Geometric tolerances......Page 119
5.7 GTs in real life......Page 124
References and further reading......Page 125
6.0 Introduction......Page 126
6.1 Roughness and waviness......Page 127
6.2 Measuring the surface finish......Page 128
6.3 Surface finish characterization......Page 131
6.4 Tolerances applied to the assessment of surface finish......Page 138
6.5 Method of indicating surface finish and texture......Page 139
6.7 Surface finish specification in the real world......Page 145
References and further reading......Page 147
Appendix: Typical Examination Questions......Page 149
Background and Rationale of the Series......Page 173
Index......Page 175
