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LECTURE 3 ENGN103 ENGINEERING DRAWING ORTHOGRAPHIC PROJECTIONS

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### Transcript of ENGN103 ENGINEERING DRAWING ORTHOGRAPHIC PROJECTIONS · ORTHOGRAPHIC PROJECTION- SIMPLE SHAPES...

L E C T U R E 3

ENGN103 ENGINEERING DRAWING

ORTHOGRAPHIC PROJECTIONS

WHAT IS ORTHOGRAPHIC PROJECTION?

• Orthographic Projection is a method of

representing a three dimensional object on paper

using several two dimensional views.

• It is the international language of Engineers and

Designers

Front elevation Side elevation

Plan – Top view

ORTHOGRAPHIC PROJECTION- SIMPLE SHAPES

1. Rectangle of sides 50 x 35 mm resting on HP.

2. Rectangle of side 50 x 35 mm, with short edge on HP. 10mm

away from PP and 5mm away from VP.

3. Rectangle of side 50 x 35 mm, with short edge on HP. 10mm

away from PP and 5mm away from VP. Inclined at 30degree to

VP.

4. Rectangle of sides 50 x 35 mm, with one corner on HP. Making

30degree and 60degree with HP.

corner

Short edge

Long edge

ORTHOGRAPHIC PROJECTION- SIMPLE SHAPES

• Draw the orthographic projections:

1. Circle of radius 25mm resting on HP, 10mm away

from VP and PP.

2. Triangle of sides 40mm, 15mm and 35mm. 7.5mm

away from PP, 10mm away from VP and 7.5mm

above HP.

3. Hexagon of side 25mm. 10mm away from VP.

4. Rectangle of sides 35mmx60mm lying flat on HP. A

square of side 25mm is resting on the rectangle

with its corner on the center of the rectangle.

DRAW ORTHOGRAPHIC PROJECTIONS:

• Cube of side 45mm with a whole of 10mmx10mm in

the center of one of the sides.

• Triangular Pyramid of sides 30mm and height 55mm.

• A cone of base radius 20mm and height 40mm.

Resting on the corner

• A cylinder of base radius 15mm and length 55mm.

Resting on the side.

ORTHOGRAPHIC PROJECTION OF OBJECTS

Front elevation Side elevation

Plan – Top view Isometric view

Width Depth

Height

Width

He

igh

t

Depth

Depth

Wid

th

He

igh

t

FRONT ELEVATION SIDE ELEVATION

PLAN

FRONT ELEVATION SIDE ELEVATION

FRONT ELEVATION SIDE ELEVATION

PLAN

FRONT ELEVATION SIDE ELEVATION

PLAN

FRONT ELEVATION SIDE ELEVATION

PLAN

FRONT ELEVATION SIDE ELEVATION

PLAN

CENTERLINES

PRECEDENCE OF LINES

FRONT ELEVATION SIDE ELEVATION

PLAN

PLAN

SIDE ELEVATION FRONT ELEVATION