The document discusses auxiliary views in technical drawings. It begins by defining auxiliary views as orthographic projections of angled surfaces that appear foreshortened in standard multi-view drawings. It then explains that auxiliary views are used to show the true size and shape of angled surfaces. The document provides steps for creating auxiliary views, including determining the dimension to show, drawing construction lines, and projecting points perpendicular from the reference view. It distinguishes between primary, secondary, partial, and half auxiliary views.

1. CHAPTER-5
AUXILIARY VIEW DRAWING
By Mr Leliso H.

2. Auxiliary Views
An auxiliary view is an orthographic
projection of an angled surface on an object,
which appears foreshortened in a typical
Multiview drawing.
Auxiliary views are used to show the true
size and shape of an angled surface and its
features.

3. To visualize and solve problems involving
inclined or oblique planes, one should
draw views on other projection planes
than the principal projection planes (front,
top and right side).

5. Some objects may have irregular shapes which are
inclined to the principal planes of projection. And
application of orthographic projection on those
views may result distorted views reflecting the false
shape of the given object.
-The true shape and size of the plane can only be
obtained by projecting it on plane which is parallel
to inclined face. Such planes are called Auxiliary or
Additional or helping planes.

6. Auxiliary planes are planes which are used to project
inclined surfaces in to their true shape
•Those views obtained are called auxiliary views
•a view must be projected on to a plane parallel to the
surface
•Generally the need of auxiliary view is give the detail of
irregular face which is projected at right angles to the edge
view
•Normally auxiliary view is treated using 3rd angle
projection
•The two types of auxiliary views are primary and
secondary

7. A depth auxiliary view is derived from a front or
back view of an object and will show true depth.
A width auxiliary view is derived from a side
view of an object and will show true width.
A height auxiliary view is derived from the top
or bottom view of an object and will show true
height.

8. Types of Auxiliary Views
1, The primary auxiliary view
•The auxiliary plane is inclined to four of the six principal planes
of projections and appears as an edge view in the remaining two
principal planes
•The views obtained are called primary views
Explanation of the below figures
•All show the primary auxiliary views for an inclined plane
•Three types of primary auxiliary views are obtained
•View when the edge view of the irregular face is shown in the
front
•View when the edge view of the irregular face is shown in the top
•View when the edge view of the irregular face is shown in the
side

10. Creating Auxiliary Views
Step #1: Start with a multiview drawing of an
object that contains a canted surface. In
this case, the canted surface for which
the auxiliary view will be created is
shown as an angled edge in the front
view.

11. 1
2
3
4
5
67
8
9
1
2,9 3,8
4,7
5,6
12
3
4
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678,9
1,2
3,4
5
68,79
CONT…

12. Step #2: Determine which true dimension will be
shown by the auxiliary view and identify
reference edges on the proper existing
view.
Draw appropriately spaced construction
lines where the auxiliary view will occur.
These construction lines will serve as
reference lines and must be parallel to the
angled edge in question.
CONT…

13. Edge View of
Reference Plane

14. Step #3: Draw construction lines outward from
each corner on the view from which the
auxiliary view will be a 90° rotation. The
lines must be perpendicular to the angled
edge in question.
Identify the relationship between the
corners of the object and the intersections
of the construction lines.
CONT…

15. 4
3 6
2
1
5
8
7
9
1
2
3
4
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67
8
9
1
2,9 3,8
4,7
5,6
12
3
4
5
678,9
1,2
3,4
5
68,79

16. Step #4: Draw object lines to
connect corners that share a
visible edge.
CONT…

17. 4
3 6
2
1
5
8
7
9
1
2
3
4
5
67
8
9
1
2,9 3,8
4,7
5,6
12
3
4
5
678,9
1,2
3,4
5
68,79

18. This auxiliary view, as projected from the
front view, shows the true size and true
shape of one of the angled surfaces. If a
feature, such as a hole, were located on
this surface, it could now be properly
dimensioned.

19. • we can unfold
the projection
plane that is
parallel to the
slanted surface
we wish to show
as true shape
and size.
CONT…

20. Cont…
• We see that the
new auxiliary
view will be
projected from
the front view
where the
surface appears
as an edge.
• Here’s why we do

21. Cont…
• Between each view
are imaginary lines
that represent the
edge view of the
planes of projection.
• These planes allows
us to use the
characteristics of the
lines that make up
each view.
• For example…..

22. CONT…
• Rule #1:
• If a line is parallel to
the Plane of Projection
(PP), it will always be
true length in the
adjacent view.
• You see that Line AD
in the TOP view is
parallel to PP H. It is
also parallel to PP P in
the RIGHT SIDE view.
Therefore, it will show
its true length in the
FRONT view.

23. Cont…
• Rule #2:
• If a line appears as a
point in any view, it
will be true length in
the adjacent view.
• You can see that line
DC appears as a point
in the FRONT view.
Therefore, it is true
length in both the TOP
and RIGHT SIDE
views.

24. Cont…
• Step 1:
• Make a new PP line
labeled “1” that is
parallel to Line AD in
the FRONT view.
• This PP may be
placed any distance
from the object you
wish.

25. Cont…
• Step 2:
• Add the other PP
lines as shown so
they will connect to
PP 1.
• It is always a good
idea to label the
PPs as shown.

26. Cont…
• Step 3:
• Project the end
points of Line AD at
a 90 degree angle
(perpendicular) from
the front view.

27. Cont…
• Step 4:
• Transfer the
distance from PP to
point C in the TOP
view…
• …to its new position
from PP 1 in the
auxiliary view.

28. Cont…
• Step 5:
• Connect the new
point C with the
projected line to find
point B.
• Do the same thing
for points A and D.

29. Cont…
• Step 6:
• Snap your lines in
the auxiliary view to
create its final form.
• NOTE: You do not
need to label all
points on your
drawing.

30. 2, Secondary Auxiliary view
• To find the true size of an oblique line or
plane a is required

31. 4.3. Complete and Partial Auxiliary
views
• Auxiliary views may
either show the “Full”
image of the part….
• ….or be a "Partial”
view of only the
surface we wish to
view.

32. Cont...
• This technique
uses points in the
principle views
that have been
transferred to the
auxiliary view to
create true shape
features.

33. Cont…
• Half auxiliary view: Used for symmetrical
objects in which only half of the object is
shown

34. Curved Lines in Auxiliary
view
• Curves in auxiliary views are handled
similar to the offset coordinate method
used with pictorial views

35. Thank you!