Page 6 - ENGINEERING DRAWING
P. 6
3.3 Projection Systems 35
3.4 Orthographic Projection 35
3.4.1 Lines in Orthographic Drawing 38
3.4.1.1 Line Thickness 38
3.4.1.2 Line Styles 38
3.4.2 Dimensioning in Orthographic Drawing 39
3.4.2.1 Type of Dimension 39
3.4.3 Constructions 48
3.5 Isometric Drawing 45
3.5.1 Angles in Isometric Drawing 46
3.5.2 Isometric Circles 47
3.5.2.1 Plotting an Isometric Circle 47
3.5.3 Constructions
4 Geometric Dimensioning and Tolerance
4.1 Introduction 51
4.2 Principles of Dimensioning 51
4.3 Terminology 54
4.4 Basic Concept 55
4.5 Execution of Dimensions 56
4.5.1 Extension and Dimension Line 56
4.5.2 Dimension Number 58
4.5.2.1 Number System 58
4.5.2.2 Unit 59
4.5.2.3 Narrow Space Situation 59
4.5.2.4 Orientation 60
4.6 Dimensioning the Object’s Features 61
