intro to aux views

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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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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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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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.)

intro to aux views

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