Lecture Slides Auxiliary materials Reference Books Study Guide.
Lecture 4 Saturday, 23 May 2015 1 ENGINEERING GRAPHICS 1E9 Lecture 4: Auxiliary Views.
-
Upload
irma-price -
Category
Documents
-
view
216 -
download
0
Transcript of Lecture 4 Saturday, 23 May 2015 1 ENGINEERING GRAPHICS 1E9 Lecture 4: Auxiliary Views.
Lecture 4 Tuesday 18 April 2023 2
Auxiliary ViewAn auxiliary view is an orthographic view taken in such a manner that the lines of sight are not parallel to the principal projection planes (frontal, horizontal, or profile). There are an infinite number of possible auxiliary views of any given object.Principal faces of the object are not parallel to PP planes.
Lecture 4 Tuesday 18 April 2023 3
Why Auxiliary View?• Inclined planes and oblique
lines do not appear true length or true size in any of the principle planes of projection
• To determine the true length of an oblique line or the true size of an inclined plane, an auxiliary view must be created.
• The auxiliary view shows the true shape and size of circular shapes.
Lecture 4 Tuesday 18 April 2023 4
Steps of Drawing
1. Select the face that is to be drawn as i) a true surface, ii) a true length line, iii) an end view of a line.
Lecture 4 Tuesday 18 April 2023 5
Steps of Drawing
2. Draw construction lines perpendicular to the surface/line/point of interest. This line should go in a direction, and far enough that leaves enough space for the view.
Lecture 4 Tuesday 18 April 2023 6
Steps of Drawing
3. Draw a folding line at an appropriate distance. This will act as a reference plane.
Lecture 4 Tuesday 18 April 2023 7
Steps of Drawing
4. Transfer distances from another view (adjacent view). This view will typically be the view adjoining the view that the auxiliary is drawn from.
Lecture 4 Tuesday 18 April 2023 8
Steps of Drawing
5. Complete the view. Draw visible and hidden lines as seen from the direction of projection lines.
Lecture 4 Tuesday 18 April 2023 9
Example 2
1. Draw two orthographic views and assume a direction of sight for auxiliary view.
Lecture 4 Tuesday 18 April 2023 10
Steps of Drawing
2. Draw construction lines parallel to the arrow.
Lecture 4 Tuesday 18 April 2023 11
Steps of Drawing
3. Assume reference plane coinciding with back surface. Draw reference plane (edge view) in the top view and auxiliary view.
Lecture 4 Tuesday 18 April 2023 12
Steps of Drawing
4. Draw auxiliary view of surface A. Transfer depth measurements from top view.
Lecture 4 Tuesday 18 April 2023 13
Steps of Drawing
5. Complete the view by adding other visible edges and objects.
Lecture 4 Tuesday 18 April 2023 15
Classification of Auxiliary Views
• Auxiliary views are classified according to the principal dimension of the object shown in the view.
1. Depth/Front auxiliary view
2. Height/Top auxiliary view
3. Width/Side auxiliary view
Lecture 4 Tuesday 18 April 2023 16
Depth Auxiliary ViewAny auxiliary view projected from the ‘elevation’ showing depth of object Elevation is the adjacent view, Plan and Side-View are alternative views
Direction of sight
Lecture 4 Tuesday 18 April 2023 17
Height Auxiliary ViewAny auxiliary view projected from the plan showing height of object Plan is adjacent view, Side-View and Elevation are alternative views
Direction of sight
Lecture 4 Tuesday 18 April 2023 18
Width Auxiliary ViewAny auxiliary view projected from the side-view showing width of object Side-View is adjacent view, Plan and Elevation are alternative views
Direction of sight
Lecture 4 Tuesday 18 April 2023 19
Notes• An auxiliary view is an orthographic view taken on planes
other than principal projection (PP) planes (frontal, horizontal, or profile).
• Principal dimension shown in auxiliary view is not shown in the adjacent view from which auxiliary view is projected.
• A primary auxiliary view is projected on the plane perpendicular to one PP plane and inclined to other 2 PP planes.
• A secondary auxiliary view is projected from primary auxiliary views.
Lecture 4 Tuesday 18 April 2023 20
Other Auxiliary Views
• Any auxiliary view projected from the primary auxiliary view is secondary auxiliary view