Introduction
Pictorial drawing is a method of representing a three-dimensional image on a two -dimensional surface. it is a means of enabling a person without any technical training to visualize a design or a graphic with relative ease. All drawing principals and line types must be adhered to, meaning each type of line will be used for its particular purpose and must be used correctly. Always use a 30º set-square when necessary.
Isometric box is used as a basic start to draw isometric drawing because it guides you so it is always wise to do it.
An example of isometric box:
Introducing the lesson:
Task
GIVEN:
For this task you will have to draw an isometric drawing using the three views of a casting shown below. They are drawn in third-angle orthographic projection.
INSTRUCTIONS:
Convert the bracket into an isometric drawing and use the corner marked A on your answer sheets as the lowest point of the drawing.
Process
How to do an Isometric drawing?
•You first ensure that you have set your paper correctly using a T-square to avoid the drawing skewed drawings and lines.
STEPS IN CONSTRUCTING AN ISOMETRIC DRAWING
Step 1
♦ Draw the three axes using triangles as light as possible. Be sure the cross axes are about 30º from the lower edge of the paper.
Step 2
♦ Plot the principal dimensions, Height (H) on the vertical axis, Width (W) on the left 30º axis, and Depth (D) on the right 30º axis. Get the measurements from the orthographic views.
Step 3
♦ Draw the box or the crate lines. Use light lines only.
Step 4
♦ Draw the details of the object by analyzing the figure and determining the points in relation to other points representing the corners, surfaces and edges.
Step 5
♦ Check the accuracy of your drawing
Step 6
♦Trace the visible edges with heavier lines and label the isometric view.
Resources
♦ How to do an isometric drawing? https://www.creativebloq.com/features/isometric-drawing#:~:text=Using%20the%20ruler%2C%20draw%20a,degree%20angle%20on%20each%20side.
♦ Types of line used in isometric drawings https://www.cdli.ca/courses/grade8control/ds2/t06/02knowledge-skills/act-01a.htm#:~:text=Isometric%20drawings%20are%20unique%20in,not%20use%20colour%20or%20shading.
♦ Examples of isometric drawings https://www.civilclick.com/isometric-projection/
Isometric drawing-simplified:
Evaluation
Marks allocation:
| Marks | |
| Correct scale | 3 |
| Correct dimensions | 10 |
| Correct position | 10 |
| Accuracy | 15 |
| Neatness | 5 |
| Labelled | 2 |
| Grand total marks | 45 |
Conclusion
Learners in order to be perfect on drawings you have to keep on practicing, there's no other way besides that. It is your responsibility to learn about neatness and tidiness when doing your drawing and presentation is a reflection of your personality. Please have a look out on your "Mind Action Series" textbook on page 45 to prepare yourself for further exercises.
Credits
Media/Resources
♦Textbook(Mind Action Series)
Teacher Page
It will be wise for this tool to be used consistently as we are in this pandemic that is COVID 19 because it can help you access the work that has been done even though you were not in class.
For queries: fundisilemhlapho@gmail.com