EBOOK - Geometric and Engineering Drawing - Third Edition (K . MORLING)


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. However carefully one checks a manuscript, errors creep through. I shall be very grateful if any readers who find errors let me know through the publishers.

CONTENTS:

Part  1  Geometric  Drawing   1
1  Scales   3
The  Representative  Fraction  (RF)   3
Plain  Scales   4
Diagonal  Scales   5
Proportional  Scales   8
Exercise  1   8
2  The  Construction  of  Geometric  Figures  from  Given  Data   11
The  Triangle   14
The  Quadrilateral   19
Polygons   22
Exercise  2   28
3  Isometric  Projection   31
Conventional  Isometric  Projection  (Isometric  Drawing)   31
Circles  and  Curves  Drawn  in  Isometric  Projection   34
Exercise  3   39
4  The  Construction  of  Circles  to  Satisfy  Given  Conditions   43
The Greatest Invention of All Time  43
Exercise  4   55
5  Tangency   59
Exercise  5   63
6  Oblique  Projection   67
Circles  and  Curves  in  Oblique  Projection   68
Exercise  6   71
7  Enlarging  and  Reducing  Plane  Figures  and  Equivalent  Areas   75
Equivalent  Areas   81
Exercise  7   87
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Contents vi
 8  The  Blending  of  Lines  and  Curves   91
Exercise  8   97
 9  Loci   103
Loci  of  Mechanisms   105
Trammels   107
Some  Other  Problems  in  Loci   109
Exercise  9   112
10  Orthographic  Projection  (First  Angle  and  Third  Angle)   117
Auxiliary  Elevations  and  Auxiliary  Plans   122
Prisms  and  Pyramids   125
Cylinders  and  Cones   130
Sections   135
Exercise  10   141
11  Conic  Sections  –  the  Ellipse,  the  Parabola,  the  Hyperbola   149
The  Ellipse   150
The  Parabola   156
The  Hyperbola   159
Exercise  11   161
12  Intersection  of  Regular  Solids   165
Fillet  Curves   178
Exercise  12   179
13  Further  Orthographic  Projection   185
The  Straight  Line   185
The  Inclined  Plane   191
The  Oblique  Plane   193
Exercise  13   196
14  Developments   201
Prisms   201
Cylinders   204
Pyramids   208
Cones   212
Exercise  14   216
15  Further  Problems  in  Loci   221
The  Cycloid   221
The  Trochoid   224
The  Involute   225
The  Archimedean  Spiral   228
The  Helix   229
Exercise  15   232
Contents vii
16  Freehand  Sketching   235
Pictorial  Sketching   236
Sketching  in  Orthographic  Projection   240
17  Some  More  Problems  Solved  by  Drawing   245
Areas  of  Irregular  Shapes   245
Resolution  of  Forces   247
Simple  Cam  Design   254
Exercise  17   258
Part  2  Engineering  Drawing   263
18  Engineering  Drawing   265
Introduction   265
Type  of  Projection   265
Sections   266
Screw  Threads   272
Dimensioning   279
Conventional  Representations   284
Abbreviations   289
Framing  and  Title  Block   290
Assembly  Drawings   294
Some  Engineering  Fastenings   294
Three  Worked  Examples   301
Example  1   303
Example  2   304
Example  3   307
Exercise  18   310
19  Postscript  –  Planning  a  Design   337
Appendix  A  Sizes  of  Isometric  Precision  Hexagon  Nuts,  Bolts
and  Washers   339
Appendix  B  Sizes  of  Slotted  and  Castle  Nuts  with  Metric  Thread   341
Appendix  C  Representation  of  Threaded  Fasteners   343

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