Engineering drawing is an effective means of communicating technical ideas and problem solutions. Sketches are made to record ideas. Geometrical models are created from those sketches and are used for analysis. Finally, detail drawings or three-dimensional models are made to record the precise data needed for the production process. Visualizing, sketching, modelling, and detailing are how engineers and technologists communicate as they design new products and structures for our technological world. Actually, communication using engineering drawings and models is a language, a clear, precise language with definite rules that must be mastered if you are to be successful in engineering design. Components (machine parts) shown in a drawing can therefore be made by suitably skilled craftsmen of any nationality, provided they can ‘read’ an engineering drawing. If the drawings are correctly drawn and annotated (described) by means of notes and dimensions, the finished product will be exactly as visualized by the designer. Any misunderstandings when describing shapes and size by using only words and no drawings are thus avoided. In short, engineering drawing is a global way of communication in technical field.