Types of Pictorial Drawings and Their Applications Technical Drawing SS 2 First Term Lesson Notes Week 9

Lesson Plan: Technical Drawing – Week 9

Subject: Technical Drawing

Class: SS 2

Term: First Term

Week: 9

Age: 16-17 years

Topic: Pictorial Views (Drawings)

Sub-topic: Types of Pictorial Drawings and Their Applications

Duration: 80 minutes

Behavioral Objectives:

By the end of the lesson, students should be able to:

1. Define pictorial drawings.
2. Mention and explain types of pictorial drawings.
3. Draw blocks in isometric and oblique projection.
4. Relate isometric and oblique projections to the wall, laptops, and sockets.

Keywords:

Pictorial drawings, isometric projection, oblique projection, block drawing

Set Induction:

Begin with a discussion on the importance of pictorial drawings in everyday life and various industries.

Entry Behavior:

Students have learned basic drawing techniques and understand orthographic projections.

Learning Resources and Materials:

• Drawing instruments (protractor, compass, T-square, set square, divider, scale, French curve, straight edge)
• Drawing board and paper
• Charts and posters showing examples of isometric and oblique drawings

Building Background/Connection to Prior Knowledge:

Discuss how previous lessons on orthographic projections relate to pictorial views and their practical applications.

Embedded Core Skills:

• Critical thinking and problem solving
• Communication and collaboration
• Leadership and personal development

Learning Materials:

• Lagos State Scheme of Work for Technical Drawing
• Drawing manuals and textbooks

Instructional Materials:

• Protractor, compass, T-square, set square, divider, scale, French curve, straight edge
• Drawing board, drawing paper

Content:

1. Definition of Pictorial Drawings:
   • Pictorial drawings are 3D representations of objects that show three sides of an object in one view.
2. Types of Pictorial Drawings:
   • Isometric Projection:
     • Shows three faces of an object, where all three axes are equally foreshortened, and the angle between any two axes is 120 degrees.
   • Oblique Projection:
     • Shows the front face in true shape and size, with the other faces receding at an angle, typically 45 degrees.
3. Drawing Blocks in Isometric and Oblique Projections:
   • Isometric Projection:
     • Start with a vertical line and two lines at 30 degrees from the horizontal.
     • Draw the block by connecting points along these axes.
   • Oblique Projection:
     • Begin with a true shape of the front view.
     • Recede the other faces at 45 degrees to create depth.
4. Relating Projections to Real-Life Objects:
   • Isometric projection can be used to draw the edges of a wall.
   • Oblique projection can be applied to illustrate the front view of laptops and the depth of sockets.

Evaluation:

Fill-in-the-Blank Questions:

1. Pictorial drawings represent objects in ________.
   a) 2D
   b) 3D
   c) 1D
   d) 4D
2. The angle between axes in isometric projection is ________.
   a) 90 degrees
   b) 60 degrees
   c) 120 degrees
   d) 45 degrees
3. Oblique projection shows the front face in ________ size.
   a) Reduced
   b) Enlarged
   c) True
   d) Distorted
4. The receding angle in oblique projection is typically ________.
   a) 90 degrees
   b) 60 degrees
   c) 30 degrees
   d) 45 degrees
5. Isometric projection shows ________ faces of an object.
   a) One
   b) Two
   c) Three
   d) Four
6. Pictorial drawings are important in ________ industries.
   a) Entertainment
   b) Art
   c) Various
   d) None
7. The front face in oblique projection is drawn ________.
   a) Distorted
   b) True to shape
   c) Enlarged
   d) Reduced
8. Isometric projection helps to visualize ________ of an object.
   a) Depth
   b) Height
   c) Width
   d) All dimensions
9. Oblique projection is useful for showing ________.
   a) Internal structure
   b) External details
   c) Both a and b
   d) None
10. In isometric projection, all three axes are ________.
    a) Different
    b) Equal
    c) Unequal
    d) Irregular

Class Activity Discussion:

1. Define pictorial drawings and their importance.
2. List and describe types of pictorial drawings.
3. Explain the steps to draw blocks in isometric projection.
4. How do you draw blocks in oblique projection?
5. Relate isometric projection to a wall.
6. How is oblique projection applied to illustrate laptops?
7. Describe how pictorial views help in understanding sockets.
8. Explain the angles used in isometric and oblique projections.
9. Discuss the applications of pictorial drawings in various industries.
10. Why is it essential to learn about pictorial views?

Presentation:

Step 1: The teacher revises the previous topic on orthographic projections.
Step 2: The teacher introduces the new topic on pictorial views, explaining isometric and oblique projections.
Step 3: The teacher allows the students to demonstrate drawing blocks in both projections and relates them to real-life objects, correcting them where necessary.

Teacher’s Activities:

• Explain the concepts of pictorial views.
• Demonstrate the steps to draw isometric and oblique projections.
• Guide students as they practice drawing blocks in these projections.

Learners’ Activities:

• Follow the teacher’s demonstration.
• Practice drawing blocks in isometric and oblique projections in pairs or small groups.
• Ask questions and seek clarifications.

Assessment:

Evaluation Questions:

1. Define pictorial drawings.
2. What are the types of pictorial drawings?
3. Explain how to draw a block in isometric projection.
4. Describe the steps to draw a block in oblique projection.
5. How do you relate isometric projection to a wall?
6. How can oblique projection be used to illustrate a laptop?
7. What is the significance of pictorial views in technical drawing?
8. Explain the angles involved in isometric projection.
9. Discuss the practical applications of oblique projection.
10. Why is understanding pictorial drawings important in technical drawing?

Conclusion:

The teacher goes around to mark the students’ work, provides feedback, and makes necessary corrections to ensure proper understanding.

More Useful Links:

• Constructing and Converting Views Technical Drawing SS 2 First Term Lesson Notes Week 10 and 11
• Revision and Examination Technical Drawing SS 2 First Term Lesson Notes Week 12 and 13