Orthographic projection Notes

ORTHOGRAPHIC
PROJECTION

ENGINEERING DRAWING
DJJ10013

Orthographic projection

■ Orthographic projection, common method of representing three-dimensional objects, usually by
three two-dimensional drawings in each of which the object is viewed along parallel lines that are
perpendicular to the plane of the drawing.

■ For example, an orthographic projection of a house typically consists of a top view, or plan, and a
front view and one side view (front and side elevations).

■ https://www.youtube.com/watch?v=1_gzd-yQLuU

IMPORTANT: There are two ways of drawing in
orthographic –

First Angle and Third Angle.

■ SYMBOL :

FIRST ANGLE
AND

THIRT ANGLE

FIRST ANGLE

THIRT ANGLE

How To Draw Orthographic

■ https://www.youtube.com/watch?v=ytwEDvX-l44
■ https://www.youtube.com/watch?v=YngsIchApE4
■ https://www.youtube.com/watch?v=oKPtIT1P6pw
■ https://www.youtube.com/watch?v=8wM5-1iTQ3Q
■ https://www.youtube.com/watch?v=GIyuPyAXxNc
■ https://www.youtube.com/watch?v=BAr4EsNjgxk

EXERCISE 1 :

Appropriate position in the table.

EXERCISE 2 :

■ Complete the table by matching the
numbered orthogonal drawings with the
same isometric view.

EXERCISE 3 :

■ Study the two types and complete
the table by matching the numbered
orthogonal drawings with the same
isometric view.