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8/12/2019 Intro to Aux Views
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AUXILIARY VIEWS
Tech Ed Dept
Technical Drawing
Stuarts Draft High School
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Introduction (Cont)
However, to solve problems involving inclined
(slanted) surfaces, you will need to learn todraw views on auxiliary (additional) planes of
projection. These are called auxi l iary views.
In this lesson we will explore how to draw
these views on planes that are parallel to theinclined surfaces.
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AUXILIARY VIEWS ARE
"HELPER VIEWS"
When an object has inclinedsurfaces, these do not show
up in true shape or size inregular views. However, aview on a plane parallel tothe inclined surface doesshow its true size and
shape. This is an auxi l iaryview. It, along with the otherregular views describe theobject better.
RegularViews
Regular
Views
with
Auxiliary
View
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Why Do We Use Them?
An auxiliary view is a projection on an auxiliary
plane that is parallel to an inclined (slanting)
surface.
It is a view looking directly at the inclined surface
in a direction perpendicular to it.
Auxiliary projections are important for describingthe true geometric shapes of inclined surfaces.
You also use them for dimensioning these shapes.
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Why Do We Use Them?
In the figure to the left, a simple
inclined wedge block is shown in theregular views. In none of these viewsdoes the slanted surface, called A ,appear in its true shape. In the frontview, all that shows is its edge lineMN. In the side view, which is madeby looking in the direction of arrow Y,
surface A appears, but it is fore-shortened. Surface A is also fores-hortened in the top view. Line MNalsoappears in both views, but lookingshorter than its true length, whichshows only in the front view.
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THE RELATIONSHIP OF AUXIL IARY
VIEWS TO REGULAR VIEWS
To show Surface A in its trueshape, you need to imagine aplane parallel to it, as in
Diagram B. This is called anauxi l iary plane. A view of thisplane from the direction ofarrow X, which is perpendicularto it, will show the true size andshape of Surface A at A1.Looking at Diagram C thisauxi l iary view
has beenrevolved (turned) to align withthe plane of the paper. Byfollowing this method, you canshow the true size and shapeof any inclined surface.
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Step by Step Directions for Making
Auxiliary Views
A. Examine the views that are given for an inclined surface. B. Find the line that is considered the edge view of the inclined
plane.
C. In the front view, draw a light construction line at right angles
to the inclined surface. This is the line of sight.
D. Think of the auxiliary plane as being attached by hinges to the
front (vertical) plane from which it is developed.
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Step by Step Directions for Making
Auxiliary Views
E. From all points labeled on the frontview, draw projection lines at rightangles to the inclined surface (parallel
to the line of sight) F. Draw a reference line parallel to
the edge view of the inclined surfaceand at a convenient distance from it.
G. Transfer the depth dimension,which in this case is the primaryreference, to the reference line as
shown. H. Project the labeled points and
connect them in sequence to form theauxiliary view. The points used toidentify the shape are for solvingdifficult problems (instructionalpurposes).
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How to Draw an Auxiliary View
Using the Center Plane Reference
In diagram A, (to the left)
the object is shown in apictorial view. Because
the object is symmetrical,
you use a center plane
as a reference plane, tomake the auxiliary view
using the following steps.
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How to Draw an Auxiliary View
Using the Center Plane Reference
Diagram B shows you use acenter plane as a reference
plane, (center planeconstruction). The edge view ofthis plane appears as acenterline, lineXY, on the topview. Number the intersection
points on the top view. Thentransfer these numbers to theedge view of the inclinedsurface on the front view, asshown.
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How to Draw an Auxiliary View
Using the Center Plane Reference
Now, in the top view, find the
distances (D1& D2) from the
numbered points to thecenterline. These are the
depth measurement.
Transfer them onto the
corresponding constructionlines (gold color) that you
have just drawn, measuring
them off on either side of line
XY as shown in Diagram D.
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How to Draw an Auxiliary View
Using the Center Plane Reference
Connect and numberthese points as in
Diagram E and you willhave the auxiliary view ofthe inclined surface.Now lets watch it done
all together along withhow its done with anell ipse.
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Auxiliary ViewCenter-Plane Reference Method
Copyright 2003 Glencoe/McGraw-Hill
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Lets Practice Drawing an Auxiliary
View Using the Center Plane Reference
Following the form and
dimensions given in the
drawing on the left,
demonstrate how to create
an auxiliary view using the
front and top views only.
Remember, were after the
true size and shape of the
inclinedsurface.
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Lets Practice Drawing
an Auxiliary View
Assignment: Following the
form and dimensions givenin the drawing on the left,
draw the auxiliary view as
shown using the front and
top views only. Remember,were after the true size and
shape of the inclinedsurface
(the shaded area).
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Lets Practice Drawing
Auxiliary Views
These are additional top
views that may be in-
serted into the previous
problem (from page
338). Insert these new
top views into the
problem, adjust the frontview accordingly, and
complete the auxiliary
view. Do two drawings
per paper (front & back.)
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Lets Practice Drawing an Auxiliary
View Using the Center Plane Reference
Follow the same
directions as theprevious slide.You can findthese in your textbook on pages
338 and 339. Dotwo drawings persheet of paper(front & back.)