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© U C L D R A W I N G G Y M
Introduction
Orthographic projections are used to
represent 3D components on a flat surface
in a 2D form. The two main types are First
Angle Projection and Third Angle Projection
(TAP). We will focus on TAP.
Three views are usually used to indicate the
shape fully: A Plan, a Front view and a Right
view. Complex shapes can require a fourth;
Left view.
Orthographic 6
6a Orthographic representation
Isometric representation
Front
Plan
Right
Left
Front
Plan
RightLeft
Plan
© U C L D R A W I N G G Y M
Setting up a Third Angle Projection
Fig 6.1a shows the positioning of views
relative to each other.
Study the diagrams on sheet 6.11 then
complete the exercises on the following
sheets in this chapter.
Orthographic 6.1
Isometric representation
6.1a Third Angle Projection
Front RightLeft
Plan
Orthographic 6.11 Setting up a TAP drawing
1 On an A4 sheet of paper draw the plan first in a faint pencil line, allowing space below to
draw the front, left and right views.
2 Allow 30 mm between the bottom line of the plan and the top line of the front view and
project all widths down from the plan.
3 Project 45° swing lines from the outside edges of the front view. 4 Project all depths horizontally from the plan on to the swing lines then vertically down
to the right side view. Project heights horizontally from the front view to the right side
view. Repeat process to establish the left view.
© U C L D R A W I N G G Y M
45°45°
swing line
30mm
Plan
Front RightLeft
Plan
Front
Plan
Front
Third Angle Projection
Fig 6.2b shows a component drawn in
Third Angle Projection with one view missing.
Complete by drawing the missing view.
Refer to fig 6.2a for dimensions; e.g. the
front view is seven units wide.
6.2a Isometric representation
© U C L D R A W I N G G Y M
Orthographic 6.2
Plan
Front RightLeft
6.2b Third Angle Projection
Plan
© U C L D R A W I N G G Y M
Third Angle Projection
Orthographic 6.3
Complete the TAP drawings
by adding the missing views.
Show all hidden detail with
dotted lines. Refer to figs 6.3a
and 6.3b for dimensions.
Draw directly onto this sheet
using a pencil and ruler. Draw
in ink when you are certain
your solutions are correct.
6.3a
6.3b
Front RightLeft
Plan
Front RightLeft
Use the squares on the grid to
complete the TAP drawings.
Use a ruler and pencil and
show all hidden detail with
dotted lines. Refer to figs
6.4a and 6.4b for dimensions.
© U C L D R A W I N G G Y M
Orthographic 6.4 Third Angle Projection
Plan
Front RightLeft
Plan
Front RightLeft
6.4a
6.4b
Pen Project
Photo Album Project