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AUXILIARY ELEVATION
graphic communication @ boclair academy
Auxiliary Elevation
The elevation and plan of an angled
bearing block are shown.
Project an auxiliary elevation in the
position indicated
PLAN
ELEVATION
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Drawing Datum Lines
Start by projecting the extreme
limits of the Auxiliary Elevation
onto the given base line.
This should be done at the required
angle – in this case 45o.
PLAN
Indicate the position of the two
datum lines that will be used to
calculate heights.
X
X
ELEVATION
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Finding Centres for Curves
Measure the height of the base and
the height to the centre line.
Transfer these dimensions to the
Auxiliary Elevation.
PLAN
Draw suitable lines to indicate
these positions.
X
X
ELEVATION
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Construction of hole (1)
Looking at the drawing you should be
fairly confident that the hole on the
Auxiliary Elevation is circular and can
be drawn using compass’s.
This fact can be checked by measuring
the width and height of the hole from
the Plan and Elevation and also
confirming that there is a centre line to
indicate that the shape is circular.
PLAN
However, if you are not sure it is
worthwhile constructing the shape.
Working with the front surface of the
hole, project random cuts onto the Plan
and then onto the Auxiliary Elevation.
X
X
ELEVATION
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Construction of Hole (2)
Measure the size from the datum
line up to each of the points on the
circle.
Transfer these dimensions onto the
Auxiliary Elevation.
PLAN
Draw a smooth curve through each
of the points.
X
X
Front Elevation
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Drawing Top Curve
The same process can be carried out
for the round top of the angled
bearing block.
If you are confident that the top is a
half circle then the shape can be
drawn with compass’s using the
existing centre lines.
PLAN
However, if you are not sure,
measure the heights for the curve
using the existing random lines and
transfer the heights onto the Auxiliary
Elevation.
X
Draw a smooth curve through each
point.
X
ELEVATION
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Drawing Outlines of Top
Before starting to draw the base of
the bearing block, the top can be
finished by darkening the outlines.
PLAN
X
X
ELEVATION
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Drawing Base
Project each of the corners of the
base from the Plan to the Auxiliary
Elevation.
Each of the edges can be darkened
to finish the drawing.
PLAN
X
X
ELEVATION
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Finished Drawing
This slide shows the finished drawing.
PLAN
X
X
ELEVATION
graphic communication @ boclair academy
AUXILIARY ELEVATION
finished
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