Title: Drawing a Nut and Bolt in Engineering Graphics and Design

Grade Level: High School (9th-12th grade)

Subject: Engineering Graphics and Design

Duration: 2 class periods (90 minutes each)

Objectives: 1. Students will understand the basic principles of engineering graphics and design. 2. Students will learn how to create accurate technical drawings of a nut and bolt. 3. Students will develop their skills in using drafting tools and techniques. 4. Students will apply their knowledge of engineering graphics to create a 3D representation of a nut and bolt.

Materials: - Engineering drawing paper - Pencils (HB and 2H) - Erasers - Rulers (preferably with metric measurements) - Compass - Protractor - Engineering drafting software (optional)

Procedure:

Day 1:

Introduction (10 minutes): 1. Begin the lesson by discussing the importance of engineering graphics and design in various fields of engineering. 2. Explain the significance of accurate technical drawings in manufacturing and assembly processes.

Demonstration (20 minutes): 1. Show students examples of technical drawings of nuts and bolts. 2. Explain the different views (top, front, and side) and the importance of dimensioning in engineering graphics. 3. Discuss the use of orthographic projection and isometric projection in representing 3D objects.

Hands-on Activity (60 minutes): 1. Distribute engineering drawing paper, pencils, erasers, rulers, compasses, and protractors to each student. 2. Instruct students to draw the top, front, and side views of a nut and bolt using the given dimensions. 3. Encourage students to use proper drafting techniques, such as light construction lines, accurate measurements, and neatness. 4. Circulate the classroom to provide individual guidance and support as needed.

Day 2:

Review (10 minutes): 1. Begin the class by reviewing the concepts covered in the previous session, including orthographic projection and dimensioning.

Demonstration (20 minutes): 1. Introduce the concept of isometric projection and its application in engineering graphics. 2. Show students how to create an isometric drawing of a nut and bolt using a 30-degree set square or engineering drafting software (if available).

Hands-on Activity (60 minutes): 1. Instruct students to create an isometric drawing of the nut and bolt they drew in the previous session. 2. Encourage students to pay attention to the angles and proportions while creating the isometric projection. 3. Remind students to use proper drafting techniques and to include accurate dimensions in their drawings.

Conclusion (10 minutes): 1. Have students share their drawings with the class. 2. Discuss the challenges they faced and the strategies they used to overcome them. 3. Emphasize the importance of precision and attention to detail in engineering graphics and design.

Assessment: 1. Evaluate students’ technical drawings based on accuracy, neatness, and adherence to drafting techniques. 2. Assess students’ understanding of the concepts covered through class participation and their ability to explain the steps involved in creating technical drawings.

Extension Activity: 1. Challenge advanced students to create an exploded view of the nut and bolt, showing individual components and their assembly. 2. Encourage students to explore engineering drafting software to create 3D models of nuts and bolts.

Note: Adjust the lesson plan duration and complexity based on the grade level and prior knowledge of the students.