Manual of Engineering Drawing Second edition By Colin H Simmons and Dennis E Maguire

Contents

Drawing office management and organization

Product development and computer-aided design

CAD organization and applications

Principles of first and third angle orthographic projection

Linework and lettering

Three-dimensional illustrations using isometric and oblique projection

Drawing layouts and simplified methods

Sections and the sectional view

Geometrical constructions and tangency

Loci applications

True lengths and auxiliary views

Conic sections and interpenetration of solids

Development of patterns from sheet materials

Dimensioning principles 100

Screw threads and conventional representations

Nuts, bolts, screws, and washers

Keys and keyways

Worked examples in machine drawing

Limits and fits

Geometrical tolerancing and datums

Application of geometrical tolerances

Maximum material and least material principles

Positional tolerancing

Cams and gears

Springs

Welding and welding symbols

Engineering diagrams

Bearings and applied technology

Engineering adhesives

Related standards

Production drawings

Drawing solutions

Preface

This latest edition of A Manual of Engineering Drawing has been revised to include changes resulting from the introduction of BS 8888. British Standard 308 was introduced in 1927 and acknowledged by Draughtsmen as THE reference Standard for Engineering Drawing. The British Standards Institution has constantly kept this Standard under review and taken account of technical developments and advances. Since 1927, major revisions were introduced in 1943, 1953, 1964 and 1972 when the contents of BS 308 Engineering Drawing Practice was divided into three separate sections.

Part 1: General principles.

Part 2: Dimensioning and tolerancing of size.

Part 3: Geometrical tolerancing.

In 1985, the fifth revision was metricated. During the period 1985–2000 major discussions were undertaken in co-operation with International Standards Organizations. The general trend in Engineering Design had been that the designer who was responsible for the conception and design of a particular product generally specified other aspects of the manufacturing process. Gradually, however, developments from increased computing power in all aspects of production have resulted in progressive advances in manufacturing techniques, metrology, and quality assurance. The impact of these additional requirements on the Total Design Cycle resulted in the withdrawal of BS 308 in 2000. Its replacement BS 8888 is a far more comprehensive Standard. The full title of BS 8888 reflects this line of thought.BS 8888. Technical product documentation (TPD).Specification for defining, specifying and graphically representing products. It must be appreciated and emphasized that the change from BS 308 to BS 8888 did not involve abandoning the principles of Engineering Drawing in BS 308. The new Standard gives the Designer a vastly increased number of tools at his disposal. It is important to stress that British and ISO drawing standards are not produced for any particular draughting method. No matter how a drawing is produced, either on an inexpensive drawing board or the latest CAD equipment, the drawing must conform to the same standards and be incapable of misinterpretation. The text which follows covers the basic aspects of engineering drawing practice required by college and university students, and also professional drawing office personnel. Applications show how regularly used standards should be applied and interpreted. Geometrical constructions are a necessary part of engineering design and analysis and examples of two and three-dimensional geometry are provided. Practice is invaluable, not only as a means of understanding principles but in developing the ability to visualize shape and form in three dimensions with a high degree of fluency. It is sometimes forgotten that not only does a draughtsman produce original drawings but is also required to read and absorb the content of drawings he receives without ambiguity. The section on engineering diagrams is included to stimulate and broaden technological interest, further study, and be of value to students engaged on project work. Readers are invited to redraw a selection of the examples given for experience, also to appreciate the necessity for the insertion and meaning of every line. Extra examples with solutions are available in Engineering Drawing From First Principles using AutoCAD, also published by Butterworth-Heinemann. It is a pleasure to find an increasing number of young ladies joining the staff in drawing offices where they can make an effective and balanced contribution to design decisions. Please accept our apologies for continuing to use the term ‘draughtsmen’, which is the generally understood collective noun for drawing office personnel, but implies equality in status. In conclusion, may we wish all readers every success in their studies and careers? We hope they will obtain much satisfaction from employment in the absorbing activities related to creative design and considerable pleasure from the construction and presentation of accurately defined engineering drawings.