### Lesson Plan: Technical Drawing - Pictorial Drawing Revision
**Subject:** Technical Drawing
**Grade Level:** Senior Secondary 2
**Lesson Topic:** Revision - Pictorial Drawing
**Duration:** 80 minutes
#### Objectives:
By the end of the lesson, students will be able to:
1. Identify different types of pictorial drawings (Isometric, Oblique, and Perspective).
2. Understand the principles and techniques involved in creating each type of pictorial drawing.
3. Apply these principles to create accurate pictorial drawings from given orthographic projections.
4. Evaluate and critique their own drawings and those of their peers.
#### Materials Needed:
- Drawing paper
- Pencils (HB, 2H)
- Erasers
- Rulers
- Set squares
- Protractors
- Compass
- Samples of isometric, oblique, and perspective drawings
- Orthographic projection worksheets
- Projector and screen (optional for showing examples)
#### Lesson Outline:
##### 1. Introduction (10 minutes)
- **Greeting and Roll Call:**
- Welcome the students and take attendance.
- **Objective Overview:**
- Briefly explain the lesson objectives.
- Importance of pictorial drawings in technical design.
##### 2. Review of Pictorial Drawing Types (25 minutes)
- **Isometric Drawing:**
- Discuss characteristics: equal axes angles (120 degrees), no perspective distortion.
- Explain isometric axes and measurement.
- Show examples and demonstrate briefly on the board.
- **Oblique Drawing:**
- Discuss characteristics: front face true size, receding axes at 45 degrees or other angles.
- Explain Cavalier and Cabinet Projections.
- Show examples and demonstrate briefly on the board.
- **Perspective Drawing:**
- Discuss characteristics: convergence to vanishing points, realism.
- Explain one-point, two-point, and three-point perspectives.
- Show examples and demonstrate briefly on the board.
##### 3. Guided Practice (25 minutes)
- **Isometric Drawing Exercise:**
- Provide an orthographic projection and guide students through converting it to an isometric drawing.
- Monitor and assist students as they work.
- **Oblique Drawing Exercise:**
- Provide a different orthographic projection for creating an oblique drawing.
- Check progress, provide tips, and correct techniques as needed.
##### 4. Independent Practice (15 minutes)
- **Perspective Drawing Exercise:**
- Provide an orthographic projection and have students convert it to a one-point perspective drawing.
- Allow students to work independently, offering assistance as needed.
##### 5. Critique and Review (5 minutes)
- **Peer Review:**
- Have students pair up and evaluate each other's drawings.
- Encourage constructive feedback focusing on accuracy and technique.
- **Class Discussion:**
- Briefly discuss common errors and successful techniques observed during the peer review.
##### 6. Conclusion (5 minutes)
- **Recap:**
- Summarize key points from the lesson.
- Emphasize the importance of mastering different types of pictorial drawings.
- **Assignment:**
- Assign a take-home task to create an isometric drawing from a provided orthographic projection.
- **Questions:**
- Open the floor for any questions or concerns.
##### 7. Closing (3 minutes)
- **Reminder:**
- Remind students about the importance of practice and the upcoming assessments.
- **Goodbye:**
- Thank the students for their participation and attention.
#### Assessment:
- Informal assessment through observation during guided practice.
- Peer review and feedback during critique session.
- Homework assignment to be submitted in the next class for formal assessment.
#### Homework:
- Complete the assigned isometric drawing from the provided orthographic projection, ensuring accuracy and clean presentation.
#### Notes for Teachers:
- Prepare transparency slides or digital examples to expedite the review of pictorial types.
- Consider grouping weaker students with stronger ones during peer review for balanced feedback.
- Adjust the difficulty of orthographic projections based on students' proficiency level.
By the end of this revision session, students will have reinforced their skills in creating and understanding various pictorial drawings, which are crucial for their continued success in technical drawing.