Constructing and Converting Views Technical Drawing SS 2 First Term Lesson Notes Week 10 and 11

Lesson Plan: Technical Drawing – Week 10 and 11

Subject: Technical Drawing
Class: SS2
Term: First Term
Week: 10 and 11
Age: 16-17 years
Topic: Pictorial Drawing
Sub-topic: Constructing and Converting Views
Duration: 80 minutes

Behavioral Objectives:

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

1. Construct given views correctly.
2. Convert orthographic views to isometric and oblique projections.

Keywords:

Orthographic views, isometric projection, oblique projection, block drawing, geometrical solids

Set Induction:

Discuss the importance of being able to convert orthographic views to pictorial views in technical fields such as engineering and architecture.

Entry Behavior:

Students have learned basic orthographic projections and are familiar with isometric and oblique drawings.

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 orthographic, isometric, and oblique drawings

Building Background/Connection to Prior Knowledge:

Review the concepts of orthographic projections and their practical applications in technical drawings.

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. Constructing Given Views:
   • Understanding the importance of accurate construction in technical drawing.
   • Steps to construct given views:
     1. Identify the necessary dimensions and angles.
     2. Use drawing instruments to accurately plot points and lines.
     3. Check for accuracy and completeness.
2. Converting Orthographic Views to Isometric and Oblique Projections:
   • Isometric Projection:
     • Convert orthographic views by aligning the object’s edges at 30 degrees to the horizontal.
     • Maintain equal scaling on all axes.
   • Oblique Projection:
     • Start with the true shape of the front view.
     • Recede the other faces at a 45-degree angle, adjusting for depth.
3. Practical Applications:
   • Engineers and architects use these skills to visualize and communicate designs.
   • Isometric and oblique drawings help in understanding the spatial relationship of different components.

Evaluation:

Fill-in-the-Blank Questions:

1. Converting orthographic views to isometric projection involves aligning edges at ________.
   a) 30 degrees
   b) 45 degrees
   c) 60 degrees
   d) 90 degrees
2. Oblique projection starts with the ________ view.
   a) Side
   b) Top
   c) Front
   d) Bottom
3. Accurate construction in technical drawing is important for ________.
   a) Design communication
   b) Aesthetics
   c) Cost estimation
   d) Material selection
4. Orthographic views are typically ________.
   a) 2D
   b) 3D
   c) 1D
   d) 4D
5. Isometric projections maintain equal scaling on all ________.
   a) Faces
   b) Lines
   c) Axes
   d) Points
6. The angle used for receding lines in oblique projection is ________.
   a) 30 degrees
   b) 45 degrees
   c) 60 degrees
   d) 90 degrees
7. Converting views helps in visualizing ________.
   a) Textures
   b) Colors
   c) Designs
   d) Materials
8. Technical drawings are essential in ________ industries.
   a) Fashion
   b) Engineering
   c) Culinary
   d) Entertainment
9. Isometric drawings are useful for understanding ________.
   a) Costs
   b) Designs
   c) Textures
   d) Colors
10. Oblique projections help in visualizing ________.
    a) Designs
    b) Textures
    c) Costs
    d) Colors

Class Activity Discussion:

1. Define orthographic views and their importance.
2. Explain the steps to construct given views correctly.
3. Describe how to convert orthographic views to isometric projections.
4. Discuss the process of converting orthographic views to oblique projections.
5. Explain the practical applications of isometric drawings.
6. Describe the applications of oblique drawings.
7. Discuss the importance of accurate construction in technical drawing.
8. Explain why converting views is essential in technical fields.
9. Discuss the difference between isometric and oblique projections.
10. Explain the benefits of learning pictorial drawing skills.

Presentation:

Step 1: The teacher revises the previous topic on pictorial views.

Step 2: The teacher introduces the new topic on constructing and converting views, explaining the steps and importance.

Step 3: The teacher allows the students to practice converting orthographic views to isometric and oblique projections, providing guidance and corrections as needed.

Teacher’s Activities:

• Explain and demonstrate the process of constructing given views.
• Show how to convert orthographic views to isometric and oblique projections.
• Provide examples and supervise student practice.

Learners’ Activities:

• Follow the teacher’s demonstration.
• Practice converting orthographic views to isometric and oblique projections in pairs or small groups.
• Ask questions and seek clarifications.

Assessment:

Evaluation Questions:

1. What are orthographic views?
2. Explain the importance of constructing views accurately.
3. How do you convert an orthographic view to an isometric projection?
4. Describe the steps to convert an orthographic view to an oblique projection.
5. Why is converting views important in technical drawing?
6. What industries benefit from isometric drawings?
7. Discuss the benefits of oblique drawings.
8. Explain the angle used in isometric projections.
9. How does accurate construction help in design communication?
10. Why is it important to learn about pictorial drawings?

Conclusion:

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