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.
- Preliminary drawing skill (6 hours)
- 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.
- Drafting equipments and their use, importance of accuracy, drawing sheet format and layout of drawing sheet etc.
- Skill development practice in drafting: Different types of line, line weights etc.; convention for lines, materials and features, texture of different materials.
- Lettering and its types: Proportional base, style base & stroke and direction base.
- Scale and dimensioning: Its types and systems.
- Reproduction of geometrical and building drawings at different scales.
- Geometrical drawings: Point, line bisection, perpendicular line, parallel line, trisection of line, bisection of angle, trisection of angle etc.
- Inscribing and describing of circle about a triangle, square and polygon etc.
- Construction of square, different types of polygons, external and internal tangents, arc tangents, special curves, conical sections and other geometrical constructions.
- Tracing in pencil & ink medium.
- Theory of Projection (1 hour)
- Introduction
- Types of projection:
a) Orthographic projection
b) Pictorial projection.
- Pictorial projection:
a) Axonometric
b) Oblique
c) Perspective.
- Orthographic Projection (2D drawing) (3 hours)
- Introduction
- System of three planes
- Principles of orthographic projection
- Projection of point in different planes
- Projection of lines of different position in relation to the projection planes
- Projection of rectangular surfaces of different position in relation to the projection planes
- Projection of solids (cube, hexagonal prism, cylinder, cone, pentagonal pyramid and sphere) in different projection planes
- Projection of point and lines on the surface of solid figures
- Projection of three dimensional objects in different planes (conversion of isometric views into orthographic projection)
- Pictorial Projection (3D drawing) (2 hours)
- Isometric Projection: Isometric scale, isometric axes, isometric lines, non-isometric lines, isometric planes
- Conversion of orthographic views into isometric projection and drawing
- Conversion of geometrical and architectural drawing into axonometric projection 45°- 45°, 30° - 60° (Metric projection)
- Different views sections and surfaces (3 hours)
- Auxiliary views and its type and projection
- Sectional views and its types and projection (section of solids)
- Intersection of surfaces and its methods of projection
- 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:
- D.K.Ching, Architectural Graphics 3rd edition.
- R.K. Dhawan A text book of Engineering Drawing 7th edition.
- K. Venugopal Engineering drawing & graphics 5th edition.
- N.D. Bhatt & V.M. Panchal Engineering drawing (plane & solid geometry)
- Warren J. Luzadder and Jon M. Duff Fundamentals of engineering drawing.
- F.E. Giescke, A. Mitchell, and others Technical Drawing
- T.E. French, C.J. Vierck and R.J. Foster Engineering Drawing Graphic Technology
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