SARVAJANIK COLLEGE OF ENGINEERING MECHANICAL ENGINEERING DEPARTMENT ENGINEERING

SARVAJANIK COLLEGE OF ENGINEERING MECHANICAL ENGINEERING DEPARTMENT ENGINEERING GRAPHICS SUBJECT CODE: 2110013 B. E. 1 st YEAR

PART 1

COMMUNICATION Communication is defined as, “the act of communicating, that is, passing on news, information, feelings etc. ” (Oxford Students’ Dictionary of Current English – 1985)

Purpose of Communication The purpose of communication – irrespective of the form/means in which it is conveyed – is to pass a message from one entity (a person or group of people) to another entity (person or group) in the most convenient way and with minimum distortion or ambiguity.

Forms of Communication The two main forms of communication are through AUDIO AND VISUAL MEANS. Audio means rely on sound signals that are perceived by ears. Sound producing/receiving devices are used for this purpose. Visual means on the other hand, depend on light signals (images) that are perceived by eyes. Image producing/receiving devices are used for this purpose. This may include things like text, drawings, figures, photographs, video images, TV images, images of real objects etc. Other human senses are sometimes used for communication (e. g. a touch to attract attention, braille text for the blind, etc).

Technical Communication Technical communication is an advanced form of communication whereby people of the same trade (profession) can convey messages to one another more accurately and precisely. To achieve this, a technical language, which is well standardized, is needed (e. g. botanical names for plant scientists, etc). Pictorial Communication Pictorial communication includes drawings and photographs. Drawings and photographs, where appropriate, convey the message more accurately than a passage of words. Photographs are more accurate and sometimes the true colors of the object are displayed. However, photographs are expensive, less informative and their magnification is limited in terms of clarity. On the other hand, drawings are cheap, clearer and easy to understand. They are therefore, in most cases, more preferred than photographs.

PART 2

Why Drawing?

REASON 1

How DO YOU Conceive IDEA

REASON 2

As a Food Scientist and Technologist, you will inevitably be required to communicate with different people for different reasons. In some situations, communications will be sufficiently taken care of by use of plain text. However in other situations, text alone may not suffice and a more specialized form of communication (technical/engineering drawing) may prove irreplaceably useful.

REASON 3

Try writing the description of these pictures……………

And let someone attempt to make a sketch or visualize from your description.

It can be found that … The word language is inadequate for describing the size, size shape and features completely as well as concisely.

Drawing (just like photography) is one of the basic forms of visual communication. Drawing is used to record objects and actions of everyday life in an easily recognizable manner. There are two major types of drawings: Artistic drawings and Technical drawings.

Artistic Drawings • • These are a form of freehand representation that makes use of pictures to provide a general impression of the object being drawn. There are no hard rules or standards in the preparation of artistic drawings. They are simply drawn by artists, based more or less on one’s talent and skills. Although these drawings are often very attractive, they find very limited use in the world of science.

Technical Drawings : These are detailed drawings drawn accurately and precisely. They are pictures that have been prepared with the aid of mathematical instruments in order to record and transmit technical information. They provide an exact and complete description of things that are to be built or manufactured. • Technical drawings do not portray the objects the way they directly appear to the eye • They make use of many specialized symbols and conventions in order to transmit technical information clearly and exactly. • To understand correctly interpret technical drawings, one needs to acquaint oneself with the fundamentals of technical drawing – hence the purpose of this course.

Electrical circuit

PART 3

ENGINEERING DRAWING Engineering drawing is a language of communication between engineers on international basis. The beauty of this tool of communication is that it transfers 100% information between technical peoples. Graphical presentation is more than an essay for describing the same thing.

Engineering Drawing Process

Engineering Drawing In Design Process Visualization Visualize Problem identification & exploration of ideas is the ability to mentally picture things that do not exist Sketches Draw , design and record initial ideas Communication Geometric model Created from sketches used or analysis Detail drawings & 3 D model Refine, optimize & record the precise data for production process or implementation the design solution should be communicated to others without ambiguity Documentation permanent record of the solution

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Geometric model Detail drawings & 3 D model Design Analysis Refinement and Optimization Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Geometric model Detail drawings & 3 D model Design Analysis Refinement and Optimization Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Geometric model Detail drawings & 3 D model Design Analysis Refinement and Optimization Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Geometric model Detail drawings & 3 D model Design Analysis Refinement and Optimization Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Geometric model Detail drawings & 3 D model Design Analysis Refinement and Optimization Implementation

Engineering Drawing In Design Process Problem Definition Visualize Exploration of Ideas Sketches Geometric model Detail drawings & 3 D model Design Analysis Refinement and Optimization Implementation

What will you learn in this course? You will learn - How industry communicates technical information. Visualization – the ability to mentally control visual information. Graphics theory – geometry and projection techniques. Standards – set of rules that govern how parts are made and technical drawings are represented. Conventions – commonly accepted practices and methods used for technical drawings. Tools – devices used to create technical drawings and models. Applications – the various uses for technical drawings.

Engineering Drawing Manual Drawing CADD Computer has a major impact on the methods used to design and create technical drawings. Design and drafting on computer are cheap and less time consuming. Why we go for manual drawing?

Why we go for manual drawing? Computer cannot replace the drafting board and equipment as a learning tool. Once you have learned the basics of mathematics, now after class 12, you are allowed the use of calculator and computer. If basic fundamentals are clear, better use can be made of the power of the software. To be an expert in technical drawing, this first course on Engineering (manual) Drawing is the first step.

ENGINEERING DRAWING STANDARDS Standards Definition Drawing standards are set of rules that govern how technical drawings are represented. Why Necessary Drawing standards are used so that drawings convey the same meaning to everyone who reads them.

Standard Code Country USA Code ANSI Full name American National Standard Institute Japan JIS Japanese Industrial Standard UK BS British Standard Australia AS Australian Standard Germany DIN Deutsches Institut für Normung ISO International Standards Organization