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Sunday, June 6, 2010

ENGINEERING DRAWING

ENGINEERING DRAWING - I
L T P
- - 7
RATIONALE
Drawing is the language of engineers and technicians. Reading and interpreting engineering drawing is their day to day responsibility. The subject is aimed at developing basic graphic skills in the students so as to enable them to use these skills in preparation of engineering drawings, their reading and interpretation . The emphasis, while imparting instructions, should be to develop conceptual skills in the students following BIS SP 46 – 1988.

Note:
i) First angle projection is to be followed
ii) Minimum of 16 sheets to be prepared
iii) Instructions relevant to various drawings may be given along with appropriate demonstrations, before assigning drawing practice to students

DETAILED CONTENTS
1. Handling, Use and Care of Drawing Instruments and Materials
1.1 Drawing Instruments
1.2 Materials
1.3 Layout of drawing sheets

2. Free Hand Sketching and Lettering (02 sheets)
2.1 Different types of lines in Engineering drawing as per BIS specifications
2.2 Practice of free hand sketching of vertical, horizontal and inclined lines, geometrical figures such as triangles, rectangles, circles, ellipses and curves

3. Lettering Technique and Practice (02 sheets)
3.1 Instrumental single stroke lettering of 35 mm and 70 mm height in the ratio of 7:4
3.2 Free hand lettering (Alphabet and numerals )- lower case and upper case, single stroke, vertical and inclined at 75 degree in different standards, series of 3, 5, 8 and 12 mm heights in the ratio of 7:4

4. Dimensioning Technique (01 sheet)
4.1 Necessity of dimensioning, method and principles of dimensioning (mainly theoretical instructions)
4.2 Dimensioning of overall sizes, circles, threaded holes, chamfered surfaces, angles, tapered surfaces, holes, equally spaced on P.C.D., counter sink holes, counter bored holes, cylindrical parts, narrow spaces and gaps, radii, curves and arches

5. Scales (02 sheets)
5.1 Scales - their need and importance (Theoretical instructions).
5.2 Drawing of plain and diagonal scales

6. Projection (04 sheets)
6.1 Theory of projections ( Elaborate theoretical instructions)
6.2 Drawing 3 views of given objects (Non-symmetrical objects may be selected for this exercise)
6.3 Drawing 6 views of given objects (Non-symmetrical objects may be selected for this exercise)
6.4 Identification of surfaces on drawn views and objects drawn
6.5 Exercises on missing surfaces and views
6.6 Introduction to third angle projections

7. Sections (02 sheets)
7.1 Importance and salient features, Methods of representing sections, conventional sections of various materials, classification of sections, conventions in sectioning
7.2 Drawing of full section, half section, partial or broken out sections, Offset sections, revolved sections and removed sections.
7.3 Drawing of different conventions for materials in section, conventional breaks for shafts, pipes, rectangular, square, angle, channel, rolled sections
7.4 Exercises on sectional views of different objects.

8. Isometric Views (02 sheets)
8.1 Fundamentals of isometric projections (Theoretical instructions)
8.2 Isometric views from 2 or 3 given orthographic views.

9. Symbols and Conventions (02 sheets)
9.1 Civil engineering, sanitary fitting symbols
9.2 Electrical fitting symbols for domestic interior installations
9.3 Building plan drawing with electrical and civil engineering symbols

10. Preparation of simple working drawing of furniture items like table, stool and any job prepared in the workshop. (01 sheet)

RECOMMENDED BOOKS
1. A Text Book of Engineering Drawing by Surjit Singh, Dhanpat Rai & Co., Delhi
2. Engineering Drawing by PS Gill, SK Kataria & Sons, New Delhi
3. Elementary Engineering Drawing in First Angle Projection by ND Bhatt, Charactar Publishing House
4. Engineering Drawing I & II by JS Layall, Eagle Parkashan, Jalandhar

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