COURSE OBJECTIVES:
The main learning objective of this course is to prepare the students for:
- Drawing engineering curves.
- Drawing a freehand sketch of simple objects.
- Drawing orthographic projection of solids and section of solids.
- Drawing development of solids
- Drawing isometric and perspective projections of simple solids.
CONCEPTS AND CONVENTIONS (Not for Examination)
Importance of graphics in engineering applications — Use of drafting instruments — BIS
conventions and specifications — Size, layout and folding of drawing sheets — Lettering and
dimensioning.
UNIT I PLANE CURVES
Basic Geometrical constructions, Curves used in engineering practices: Conics — Construction of
ellipse, parabola and hyperbola by eccentricity method — Construction of cycloid — construction of
involutes of square and circle — Drawing of tangents and normal to the above curves.
UNIT II PROJECTION OF POINTS, LINES AND PLANE SURFACE
Orthographic projection- principles-Principal planes-First angle projection-projection of points.
Projection of straight lines (only First angle projections) inclined to both the principal planes –
Determination of true lengths and true inclinations by rotating line method and traces. Projection of
planes (polygonal and circular surfaces) inclined to both the principal planes by rotating object
method.
UNIT III PROJECTION OF SOLIDS AND FREEHAND SKETCHING
Projection of simple solids like prisms, pyramids, cylinder, cone and truncated solids when the axis
is inclined to one of the principal planes and parallel to the other by rotating object method.
Visualization concepts and Free Hand sketching: Visualization principles —Representation of
Three Dimensional objects — Layout of views- Freehand sketching of multiple views from pictorial
views of objects.
Practicing three dimensional modeling of simple objects by CAD Software (Not for examination)
UNIT IV PROJECTION OF SECTIONED SOLIDS AND DEVELOPMENT OF SURFACES
Sectioning of above solids in simple vertical position when the cutting plane is inclined to one of the
principal planes and perpendicular to the other — obtaining true shape of section. Development of
lateral surfaces of simple and sectioned solids — Prisms, pyramids cylinders and cones.
Practicing three dimensional modeling of simple objects by CAD Software (Not for examination)
UNIT V ISOMETRIC AND PERSPECTIVE PROJECTIONS
Principles of isometric projection — isometric scale — isometric projections of simple solids and
truncated solids – Prisms, pyramids, cylinders, cones- combination of two solid objects in simple
vertical positions – Perspective projection of simple solids – Prisms, pyramids and cylinders by
visual ray method.
Practicing three dimensional modeling of isometric projection of simple objects by CAD Software
(Not for examination)
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