Transcript Auxiliary Intro

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Auxiliary Views
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Auxiliary Views
Auxiliary views are additional views that are used in
orthographic projection.
Auxiliary views are normally used to view the True Shape of a
surface which does not face the Elevation, End Elevation or Plan
at 90o.
Auxiliary views can be drawn as Auxiliary Elevations or
Auxiliary Plans.
An Auxiliary Elevation uses the same heights as the other
Elevations and as with other Elevations it is projected from the
Plan.
An Auxiliary Plan uses the same widths as the existing Plan and
similarly to the Plan it is projected from the Elevation.
An Auxiliary view can be considered as looking at the object
from different positions located somewhere between either the
Elevation and End Elevation (for Auxiliary Elevations) or between
the Plan and End Elevation (for Auxiliary Plans).
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Auxiliary Elevations
The block shown below shows an Elevation and an End Elevation
with two Auxiliary Elevations between them.
As can be seen, in the Auxiliary Elevation, heights are the same as
those on the Elevation and End Elevation.
It appears that the viewer is moving slowly round the block and
viewing it from different viewing positions at ground level.
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Auxiliary Plans
The block shown below shows a Plan and an End Elevation with two
Auxiliary Plans between them.
As can be seen the Auxiliary Plan, widths are the same as those on
the Plan and End Elevation.
It appears that the viewer is moving slowly round the block and
viewing it from different view points in a radius from directly above the
block around to ground level.
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Auxiliary Elevations
Unfortunately, because our object will be drawn on a piece of paper it
will be difficult to ‘walk round the block’ to view it from different
positions. We need to use some of the previously drawn views of the
drawing to project our views.
What this means is that the views will be drawn in slightly different
positions to that shown in the previous slide.
Each of the Auxiliary Elevations in the drawing will be projected from
the Plan, in the same way that the Elevation has been drawn (and
occasionally the End Elevation)
When drawing Auxiliary Elevations, the drawing will need to be drawn
at the angle that you choose to view the block at.
For SQA purposes this will normally only be at 30o, 45o or 60o (the
usual angles of the class set squares) although there is no reason
why other angles could not be used.
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Auxiliary Elevations
END ELEVATION
The blocks shown here
show the positions where
Auxiliary Elevations might
be positioned to show the
Front View or different
Elevations to the left hand
side.
PLAN
ELEVATION
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Auxiliary Plans
A similar situation occurs when drawing Auxiliary Plans.
Each of the Auxiliary Plans in the drawing will be projected from the
Elevation, in the same way that the Plan was projected.
When drawing Auxiliary Plans, the drawing will again need to be
drawn at the angle that you choose to view the block at.
For exam purposes, this will also normally only be at 30o, 45o or 60o.
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Auxiliary Plans
The blocks shown here show
the positions where Auxiliary
Plans might be positioned.
PLAN
Similar views could also be
drawn to the right hand side of
the Elevation.
END ELEVATION
ELEVATION
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Auxiliary Projection
The table below shows when Auxiliary Views have been used in
National Qualifications exams in past years. Look up our Past
Paper section to see how many other Auxiliary Views have come up
in more recent exams.
YEAR
Subject
Paper
Type
Baby Feeding Bottle
Higher
Auxiliary
Elevation
TOTAL MARKS FOR
QUESTION
1999
2000
2001
2002
Not specified
Approx 15
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Auxiliary Views
finished
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