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AUXILIARY PLAN
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Auxiliary Plan
Two views of a coat hook are shown
below.
The coat hook is made from Ø40mm
aluminium bar and is fixed to the wall
through a Ø4mm hole.
Draw an Auxiliary Plan showing the
True Shape of the sloping surface with
the hole through it.
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Positioning the Auxiliary Plan
Project from the Elevation to find the
extreme edges of the Auxiliary Plan.
The projection lines should be drawn
at right angles to the cut surface that is
to be drawn as a True Shape.
As the coat hook is cylindrical in shape
it is best to work with a centre line as a
datum. This should be added at right
angles to the projected lines.
X
X
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7/11
6 /12
Drawing Generators
5 /1
4/2
Divide the Elevation and
Plan into equal parts using
30o / 60o lines.
3
9
8 /10
Divide the Auxiliary Plan in
the same way.
Number each of the points
making sure that the
numbering
sequence
is
correct. (The numbering on
the Plan and the Auxiliary
Plan should be exactly the
same)
7/11
X
X
6 /12
5 /1
4 /2
1 /11
3
12
2 /10
3 /9
4 /8
Draw generators along each
of the views.
5 /7
6
8 /10
9
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7/11
6 /12
Drawing True Shape
5/1
Start by drawing the main
surface of the Auxiliary Plan.
In this case you have been asked
to draw the True Shape of the
sloping surface, so this is the
surface to start with.
4/2
3
7/11
5/1
4/2
3
1 /11
Mark each of the points with a
small dot and draw a smooth
line through each of the points.
X
X
6 /12
Project where each of the
generators cut this surface on
the Elevation onto the Auxiliary
Plan.
9
8/10
12
2 /10
3 /9
4 /8
Add the hole to the Auxiliary
Plan.
5 /7
6
8/10
9
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7/11
6 /12
Drawing End Curves
5/1
It is usual to draw all of the parts that
can be seen first and then to
concentrate on any hidden surfaces.
Therefore, the next part to be drawn
would be the right hand end of the
coat hook.
Project the points where the
generators cut the end points up to the
Auxiliary Plan.
4/2
3
9
8/10
7/11
X
X
6 /12
5/1
4/2
Project any end points of these
surfaces even though they are not
located on generator lines.
3
1 /11
12
2 /10
Mark each of the points where these
lines cross the generator lines on the 3 /9
Auxiliary Plan with a small dot. (This 4 /8
will not be possible for the end points
at present)
5 /7
6
8/10
9
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7/11 B A 8/10
Finding End Points - (method 1)
To find the end points of these curves it
will be necessary to add extra generators.
6 /12
5/1
B
A
4/2
3
Draw extra generators along the Elevation
OR Plan until they reach the half circle
construction line.
Identify each of these points on the view
used – in this case A and B have been
used.
Transfer these points onto the Auxiliary
Plan. This is done by using compasses to
measure the distance on the construction
circle from one point towards another and
transferring this size between the
appropriate points on the Auxiliary Plan.
Draw generators along the Auxiliary and
indicate the end points found with a small
dot.
Complete this part of the drawing by
adding smooth curves through each of the
points.
B
7/11
9
8/10
A
X
X
6 /12
5/1
BA
4/2
3
2 /10
1 /11
B
A
12
3 /9
4 /8
5 /7
6
9
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7/11
6 /12
Finding End Points - (method 2)
An alternative way to find these
points is to use compasses and to
measure their distance from the
datum line being used – in the
case of this drawing this is the
centre line X-X and X’-X’.
Measure the widths to each of
the points on the plan (A, B, C
and D) and transfer these sizes to
the appropriate generator lines on
the Auxiliary Plan.
9
5/1
4/2
3
A
9
8/10
D
B
A
7/11
C
X
X
6 /12
5/1
B
C
4/2
3
1 /11
12
2 /10
Care should be taken that the
points are being transferred to the
correct generator.
8/10
3 /9
4 /8
5 /7
6
D
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7/11 B A 8/10
6 /12
Darkening Outlines
Because the drawing is
beginning to look a bit
complicated with so many
lines it is a good time to
darken in the information that
we already have.
Remember that some of the
lines may be hidden from
view and should be drawn as
hidden lines if they have been
asked for in the question
5/1
B
A
4/2
3
B
7/11
9
8/10
A
X
X
6 /12
5/1
BA
4/2
3
1 /11
B
A
2 /10
12
3 /9
4 /8
5 /7
6
9
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7/11 B A 8/10
6 /12
Drawing End Ellipse
5/1
B
A
4/2
The plain end of the coat
hook can now be constructed.
Project each of the points
from the Elevation to the
Auxiliary Plan indicating any
points on the end curve with
a small dot.
3
B
7/11
9
8/10
A
X
X
6 /12
5/1
BA
4/2
3
Draw a smooth curve through
each of the points.
1 /11
B
A
2 /10
12
3 /9
4 /8
5 /7
6
9
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7/11 B A 8/10
Darkening Finished Drawing
The view is now complete
and any extra lines should
now be darkened.
Remember that some of the
lines may need to be drawn
as hidden detail.
6 /12
5/1
B
A
4/2
3
B
7/11
9
8/10
A
X
X
6 /12
5/1
BA
4/2
3
1 /11
B
A
2 /10
12
3 /9
4 /8
5 /7
6
9
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Final Drawing
The finished drawing should
look like this.
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AUXILIARY PLAN
finished
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