Chapter 1 Engineering Graphics as a Language Engineering Drawing and Design Engineering Drawing and Design

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 Mechanical Manufacturing Power Generation Transportation Power Services Atomic Energy Marine Vessels

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

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

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

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

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

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

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. Engineering Graphics as a Language

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

Drafting Equipment Drafting Machine

Drafting Equipment Triangles 45° 30°/60°

Drafting Equipment Protractors Half-Circle Full-Circle

METRIC SCALE 1:1 SCALE (1mm DIVISIONS) mm 1:

Drafting Equipment Compasses Drop Bow Bow

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