ENGN103 Engineering Drawing orthographic projections

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ENGN103 Engineering Drawing orthographic projections

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Presentation transcript:

ENGN103 Engineering Drawing orthographic projections Lecture 3

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

Side elevation Front elevation Plan – Top view

Orthographic Projection- simple shapes Rectangle of sides 50 x 35 mm resting on HP. Rectangle of side 50 x 35 mm, with short edge on HP. 10mm away from PP and 5mm away from VP. 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. Rectangle of sides 50 x 35 mm, with one corner on HP. Making 30degree and 60degree with HP. Long edge corner Short edge

Orthographic Projection- simple shapes Draw the orthographic projections: Circle of radius 25mm resting on HP, 10mm away from VP and PP. Triangle of sides 40mm, 15mm and 35mm. 7.5mm away from PP, 10mm away from VP and 7.5mm above HP. Hexagon of side 25mm. 10mm away from VP. 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

Height Height Depth Width Width Height Depth Depth Width SIDE ELEVATION FRONT ELEVATION Height Width Depth Depth Width 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

FRONT ELEVATION SIDE ELEVATION PLAN