Engineering Drawing and Design Chapter 1 Engineering Graphics

Engineering Drawing and Design Chapter 1 Engineering Graphics as a Language

The Need For Engineering Drawings People have expressed their thoughts and concepts for many centuries by the use of drawings. Some of those drawings are pure art. In engineering and technology technical drawings are widely used. Whether it is an aircraft engine or a child’s wagon, the persons responsible for making it need accurate and definitive information on all parts and on how they fit together. Drawings can be 3 -dimensional, or 2 -dimensional. The drawing can be done by computer or by hand. There are many types of engineering drawings and each has its own value and use.

Typical Branches of Engineering Drawings Manufacturing Power Generation Transportation Power Services Atomic Energy Marine Vessels Mechanical

Typical Branches of Engineering Drawings Commercial Buildings Residential Buildings Institutional Buildings Environmental Space Forms Architectural

Typical Branches of Engineering Drawings Power Generation Power Application Transportation Illumination Industrial Electronics Communications Instrumentation Military Electronics Electrical

Typical Branches of Engineering Drawings Aerodynamics Structural Design Instrumentation Propulsion Systems Materials Reliability Testing Production Methods Aerospace

Typical Branches of Engineering Drawings Liquid Transportation Manufacturing Power Services Hydraulics Pneumatics Piping

Typical Branches of Engineering Drawings Structural Designs Buildings Automobiles Planes Ships Bridges Structural

Typical Branches of Engineering Drawings New Products Assembly Instructions Presentations Community Projects Renewal Programs Technical Illustration

Engineering Graphics as a Language Our object is to study the language of engineering graphics so that we can write it clearly for those familier with it and read it readily when written by an other. To do this, we must know the basic theory and be familiar with its accepted conventions and abbreviations. Since its principles are essentially the same throughout the world, a person who has been trained in the practices of one nation can readily adapt to practices of another.

Methods of Expressions The drawing can be done by computer or by hand.

Drafting Equipment Drafting Machine

Drafting Equipment 45° 30°/60° Triangles

Drafting Equipment Half-Circle Full-Circle Protractors

METRIC SCALE 34 52. 5 81 mm 1: 1 0 10 20 30 40 50 60 1: 1 SCALE (1 mm DIVISIONS) 70 80

Drafting Equipment Drop Bow Compasses

Drafting Equipment Templates

Drafting Equipment Irregular Curves

Drafting Equipment Pencil Eraser Technical Pens

CAD Computer Aided Drafting Faster Precise Complicated shapes Solid modelling CAM (CNC) CATIA