Lesson 11
AUXILIARY VIEWS
Embedded Files
W E L C O M E !
W E L C O M E !
LESSON 11 OUTLINE
LESSON 11 OUTLINE
InShot_20220714_094906893.mp4INTRODUCTION TO AUXILLIARY
AUXILIARY VIEW INTRODUCTION
HOW TO DRAW AN AUXILIARY VIEW
OBJECTIVES
At the end of the lesson students should be able to;
explain what is an Auxiliary view
recognize Primary and Auxiliary view
to construct an Auxiliary view
WHAT IS AN AUXILIARY VIEW?
WHAT IS AN AUXILIARY VIEW?
An auxiliary view is an extra view. It is a special type of orthographic view used to describe the shape of an inclined surface of an object that cannot be described exactly and completely by any of the six normal orthographic views.
AUXILIARY VIEW
AUXILIARY VIEW
Many objects are of such shape that their principal faces cannot always be assumed parallel to the regular planes of projection.
The base of the design for the bearing is shown in its true size and shape but the rounded upper portion is situated at an angle with the planes of projection and does not appear in its true size and shape in any of the three regular views. In order to show the true circular shapes, it is necessary to assume a direction of sight perpendicular to the planes of those curves, as shown at the resulting view is called an auxiliary view. This view, together with the top view, completely describes the object. The front and right-side views are not necessary. A view obtained by a projection on any plane other than the horizontal, frontal, and profile projection planes is known as an auxiliary view.
METHODS OF CONSTRUCTING AUXILIARY VIEWS
METHODS OF CONSTRUCTING AUXILIARY VIEWS
1. Folding Line Method
1. Folding Line Method
Folding lines are the hinge lines of the glass box. Drawn at any convenient distance between two given views.
2. Reference Line Method
2. Reference Line Method
Line always assumed edgewise in regular view and auxiliary view. In case of symmetrical object, reference line may be placed on center of the object.
PRIMARY AUXILIARY VIEWS
PRIMARY AUXILIARY VIEWS
A primary auxiliary view is one that is projected directly from any one of the six normal orthographic views.
SECONDARY AUXILIARY VIEWS
SECONDARY AUXILIARY VIEWS
Occasionally ,the inclined features of an object cannot be fully described by a primary auxiliary view. When this is the case, it is necessary to draw a secondary auxiliary view. A secondary auxiliary view is always used in conjunction with and projected directly from, a primary auxiliary view.
POINTS TO REMEMBER !
1. Lines that do not help to describe the inclined surface that an auxiliary view represents should not be drawn unless they are required to clarify the shape of an object or are needed for dimensioning purposes.
2. Auxiliary views are not drawn for all inclined surfaces. They are only drawn when it is necessary to describe or dimension features of an inclined surface that cannot be described or dimensioned by means of the six normal orthographic views.
3. Partial orthographic views should be used in conjunction with auxiliary views as much as possible.
4. In some instances it is sufficient to use a partial auxiliary view to describe an inclined surface.
5. A secondary auxiliary view is projected from a primary auxiliary view and is used when it is necessary to describe features of an inclined surface that cannot be clearly described by the primary auxiliary view.
STEPS IN DRAWING AUXILIARY VIEW
STEPS IN DRAWING AUXILIARY VIEW
1. With the given regular views, visualize them carefully and identify the view with inclined
line/s.
2. Draw straight lines from all points or corners along the inclined line perpendicularly.
3. Draw straight lines from other points/corners found in the same view parallel to the lines
drawn in #2.
4. Draw two reference/folding lines, one parallel to the inclined line and another one to the
view to be measured.
SHORT DEMONSTARATION ON AUXILIARY VIEW
SHORT DEMONSTARATION ON AUXILIARY VIEW
AUXILIARY VIEW.mp4LEARNING ACTIVITY
DIRECTIONS: PRINT the ACTIVITY SHEET provided below. STRICTLY NO REVISON TO BE MADE.
LESSON11LA.docxREFERENCES:
CONTENT SOURCE:
Manaois, German M. Drafting Volume 2: Phoenix Publishing House, Inc., 1983, Reprinted 2004
Manaois, German M. Drafting Volume 2: Phoenix Publishing House, Inc., 1983, Reprinted 2004
Brown, W. C. (1994). Drafting for Industry /by Walter C. Brown. Goodheart-Willcox.
Brown, W. C. (1994). Drafting for Industry /by Walter C. Brown. Goodheart-Willcox.
Spencer, H. C., Dygdon, J. T., & Novak, J. E. (1995). Basic Technical Drawing (6th ed.). Glencoe/McGraw-Hill School Pub.
Spencer, H. C., Dygdon, J. T., & Novak, J. E. (1995). Basic Technical Drawing (6th ed.). Glencoe/McGraw-Hill School Pub.
Giesecke, Mitchell,Spencer,Hill,Dygdon Technical Drawing (Seventh Edition)
Giesecke, Mitchell,Spencer,Hill,Dygdon Technical Drawing (Seventh Edition)
VIDEO:
https://youtu.be/RxO0H1lW6o8
Page updated
Report abuse