##### Drafting I

Course Objective:

To familiarize with the use of drafting instrument and introduce drawings by the exercises through the concepts and principles of orthographic and parallel projection to develop drafting skill.

1. Preliminary drawing skill (6 hours)
1. Introduction of drawing and its classification:  Artistic drawing, engineering drawing, Geometrical drawing:  a) Plane geometrical drawing, b) Solid geometrical drawing, Architectural, Civil, Computer, Electrical, Electronics and Mechanical drawings.
2. Drafting equipments and their use, importance of accuracy, drawing sheet format and layout of drawing sheet etc.
3. Skill development practice in drafting:  Different types of line, line weights etc.; convention for lines, materials and features, texture of different materials.
4. Lettering and its types:  Proportional base, style base & stroke and direction base.
5. Scale and dimensioning:  Its types and systems.
6. Reproduction of geometrical and building drawings at different scales.
7. Geometrical drawings:  Point, line bisection, perpendicular line, parallel line, trisection of line, bisection of angle, trisection of angle etc.
8. Inscribing and describing of circle about a triangle, square and polygon etc.
9. Construction of square, different types of polygons, external and internal tangents, arc tangents, special curves, conical sections and other geometrical constructions.
10. Tracing in pencil & ink medium.

2. Theory of Projection (1 hour)
1. Introduction
2. Types of projection:
a) Orthographic projection
b) Pictorial projection.
3. Pictorial projection:
a) Axonometric
b) Oblique
c) Perspective.

3. Orthographic Projection (2D drawing) (3 hours)
1. Introduction
2. System of three planes
3. Principles of orthographic projection
4. Projection of point in different planes
5. Projection of lines of different position in relation to the projection planes
6. Projection of rectangular surfaces of different position in relation to the projection planes
7. Projection of solids (cube, hexagonal prism, cylinder, cone, pentagonal pyramid and sphere) in different projection planes
8. Projection of point and lines on the surface of solid figures
9. Projection of three dimensional objects in different planes (conversion of isometric views into orthographic projection)

4. Pictorial Projection (3D drawing) (2 hours)
1. Isometric Projection:  Isometric scale, isometric axes, isometric lines, non-isometric lines, isometric planes
2. Conversion of orthographic views into isometric projection and drawing
3. Conversion of geometrical and architectural drawing into axonometric projection 45°- 45°, 30° - 60° (Metric projection)

5. Different views sections and surfaces (3 hours)
1. Auxiliary views and its type and projection
2. Sectional views and its types and projection (section of solids)
3. Intersection of surfaces and its methods of projection
4. Development of surfaces and its methods of projection
PRACTICAL:
 S. No. Title Qty. Hour Total Marks 1. Name plate with border line & hatching line. 1 18 hours 2. Formation of lines. 1 3. Different types of lettering on proportional base. 1 4. Convection for lines, materials and textures. 2 5. Exercises on different scales of geometrical figures and building drawings. 1 6. Exercises on different system of dimensions of geometrical figures and building drawings. 1 7. Exercises on geometrical construction of point, line bisection, perpendicular line, parallel line, trisection of line, bisection and trisection of angle etc. 2 8. Exercises on inscribing and describing of circle about a triangle, square and polygon etc. 2 9. Exercises on construction of square, different types of polygons, external and internal tangents, arc tangents, special curves, conical sections and other geometrical constructions if needed. 2 10. Exercises on tracing of geometrical and building drawings in pencil and ink medium. 1 11. Exercises on orthographic and pictorial and planes in 1st and 3rd angle projection. 2 12 hours 12. Exercises on orthographic and pictorial projection of solid figures. 2 13. Exercises on orthographic projection of point and lines on the surface of solid figures. 1 14. Exercises on orthographic projection of three dimensional figures in 1st and 3rd angle projection. (Conversion of isometric drawing into orthographic projection.) 1 15. Exercises on isometric drawing and projection of different types of block models in 1st angle projection and 3rd angle projection if needed.  (Conversion of orthographic views into isometric drawings.) 2 6  hours 16. Exercises on axonometric projections (45°- 45°, 30°- 60°) of geometrical and building drawings. 2 17. Exercises on auxiliary types of view. 1 9  hours 18. Exercises on sectional type of view. 2 19. Exercises on orthographic projection of different types of section of Geometric solids. 6 20. Exercise on orthographic projection of intersection or interpenetration of different solids (prism by prism, cylinder by cylinder, cone by cylinder, cone by prism and others if needed). 1 21. Exercises on development of surfaces of different solids. (Cube, prism, cylinder, cone, pyramid, sphere and other if needed.) 2 Total 36 45 80 Internal Assessment (4 hours) - - 20 Grand Total - - 100

*Note: There may be minor deviation in marks distribution.

Reference:

1. D.K.Ching, Architectural Graphics 3rd edition.
2. R.K. Dhawan A text book of Engineering Drawing 7th edition.
3. K. Venugopal  Engineering drawing & graphics 5th edition.
4. N.D. Bhatt & V.M. Panchal Engineering drawing (plane & solid geometry)
5. Warren J. Luzadder and Jon M. Duff Fundamentals of engineering drawing.
6. F.E. Giescke, A. Mitchell, and others Technical Drawing
7. T.E. French, C.J. Vierck and R.J. Foster Engineering Drawing Graphic Technology