Abstract:
Our world has become one where computers are used to solve many problems
quickly and accurately. We use calculators to solve arithmetical problems, word processors to check spelling and grammar in texts and computer-aided design (C.A.D.)
programs to do much of our drawing for us. However, in the same way that we need
to know what , , and ÷ mean when we press that symbol on a calculator, and
we need to be able to write a text before we can ask a word processor to check it, in
the same way we need knowledge and understanding of geometric and engineering
drawing before we can use computers to help us with design. These understandings
can come through studying and using this book.
This third edition starts with and introduces the tools needed for technical drawing, with some basic exercises that will help you to practise these skills. Part 1 is
almost unchanged from earlier editions. It shows specific drawing solutions to
many geometric problems. Part 2, engineering drawing, has been updated to the latest recommendations in BS 308, the British Standards Institution publication about
engineering drawing practice. There is a new Appendix C, which shows the recommendations given in BS 308 for the simplified representation of threaded fasteners.
Finally there is a chapter that lists the types of questions that need to be asked
when creating a design. It then lists the questions that can be answered in this book
and guides you to the appropriate chapter.
Howevercarefully one checks a manuscript, errors creep through. I shall be very
grateful if any readers who find errors let me know through the publishers.
