Class: Senior Secondary School 2 (SS2 / SSS2)
Term: 2nd Term
Week: 8
Age: 16 years
Duration: 45 minutes
Subject: Metal Work
Curriculum Theme: Pre-Vocational Studies
Previous Lesson: Welding Positions and Joints.
Topic: Rivets
Subject Matter: Meaning of rivets (permanent mechanical fasteners), types of rivets, uses of rivets, riveting in sheet metal work, hand work, machine work

Specific Objectives

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

Cognitive Domain:

Define a rivet.
State at least three types of rivets.
Explain the uses of rivets in metal work.

Affective Domain:

Appreciate the importance of rivets as permanent fasteners.
Develop an interest in learning various metal joining techniques.

Psychomotor Domain:

Identify different types of rivets.
Demonstrate basic hand riveting techniques.
Produce a simple rivet joint.

Work cooperatively with peers during practical demonstrations or group activities.

Reference Materials

The following resources were used in planning this lesson:

Senior Secondary Schools Education Curriculum
State Unified Scheme of Work
Macmillan Senior Secondary Metal Work for SSS 1-3

Instructional Materials

The teacher will teach this lesson with the aid of:

Assorted rivets (e.g., snap head, flat head, countersunk)
Hammers
Drilling machine
Steel plates (for demonstration)
Rivet sets and dollys

Rationale for the Lesson

This lesson helps pupils understand rivets as important permanent fasteners in metal work. It enables them to identify different types and their applications, preparing them for practical tasks involving metal fabrication and assembly in various industries.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of different types of hand tools and simple metal joining methods.

Lesson Content/Board Summary

Rivets

Meaning of Rivets

A rivet is a permanent mechanical fastener. Before installation, it consists of a smooth cylindrical shaft with a head on one end. The end opposite the head is called the tail. Once inserted into a pre-drilled hole, the tail is deformed (usually by hammering or pressing) to form a new head, permanently joining the two or more pieces of material together.

Types of Rivets

Rivets are classified based on their head shape and material. Common types include:

Snap Head Rivets: Have a hemispherical head, commonly used for general structural work.
Flat Head Rivets: Have a flat, cylindrical head, used where a low-profile head is required.
Countersunk Head Rivets: Have a conical head that fits into a countersunk hole, creating a flush surface.
Pan Head Rivets: Have a slightly rounded, low-profile head, often used in heavy-duty applications.
Mushroom Head Rivets: Have a large, low-profile, rounded head, providing a large bearing surface.
Pop Rivets (Blind Rivets): Used when access is only available from one side of the material.

Uses of Rivets

Rivets are widely used in various applications where strong, permanent joints are required. Some common uses include:

Joining sheet metal in aircraft construction.
Fabricating structural steel components in bridges and buildings.
Assembling parts in shipbuilding.
Attaching brake linings to shoes in automotive industries.
Joining components in boilers and pressure vessels.
General repair and fabrication work in workshops.

Riveting Process

Riveting is the process of forming a permanent joint using rivets. It can be done manually (hand riveting) or using machines (machine riveting).

Hand Riveting: This involves using hand tools like a hammer, rivet set, and dolly to form the second head (tail) of the rivet. It is suitable for lighter work and where power tools are not available.
Machine Riveting: This uses a riveting machine (pneumatic, hydraulic, or electric) to quickly and efficiently form the rivet head. It is used for heavy-duty applications, mass production, and where consistent pressure is required.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils, reviews the previous lesson, and introduces the topic “Rivets” by showing samples of rivets and objects joined by rivets.
Pupils’ Activity: Pupils respond to greetings, recall previous knowledge, and observe the samples shown by the teacher.
Learning Point: Pupils are prepared for the new lesson and connect it to practical applications.

Step 2: Meaning of Rivets

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher defines what a rivet is, explaining its function as a permanent mechanical fastener, and writes the definition on the board.
Pupils’ Activity: Pupils listen attentively, ask questions for clarity, and copy the definition into their notebooks.
Learning Point: Pupils understand the basic concept and purpose of a rivet.

Step 3: Types of Rivets

Time: 8 minutes
Teaching Skill: Illustration/Classification
Teacher’s Activity: The teacher explains and shows different types of rivets (e.g., snap head, flat head, countersunk) using actual samples or diagrams.
Pupils’ Activity: Pupils observe the different rivet types, identify their features, and list them in their notes.
Learning Point: Pupils can identify and name various types of rivets based on their head shapes.

Step 4: Uses of Rivets

Time: 7 minutes
Teaching Skill: Elaboration
Teacher’s Activity: The teacher explains the various applications of rivets in different industries and everyday items, providing examples.
Pupils’ Activity: Pupils listen, contribute examples if they know any, and note down the uses of rivets.
Learning Point: Pupils understand where and why rivets are used.

Step 5: Hand Riveting

Time: 8 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher demonstrates the process of hand riveting using steel plates, a hammer, a rivet set, and a dolly, explaining each step.
Pupils’ Activity: Pupils observe the demonstration carefully, noting the tools used and the steps involved.
Learning Point: Pupils learn the practical steps for forming a rivet joint manually.

Step 6: Machine Riveting

Time: 7 minutes
Teaching Skill: Explanation/Description
Teacher’s Activity: The teacher explains the concept of machine riveting, its advantages over hand riveting, and mentions the types of machines used.
Pupils’ Activity: Pupils listen and understand the principles of machine riveting and its benefits.
Learning Point: Pupils comprehend the difference between hand and machine riveting and their respective applications.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define a rivet.
List three types of rivets.
State two uses of rivets.
Briefly explain the difference between hand riveting and machine riveting.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, emphasizing the importance of rivets in metal fabrication, and gives homework (e.g., draw and label three types of rivets).
Pupils’ Activity: Pupils listen to the summary, ask any remaining questions, and note down the homework.
Learning Point: The lesson is reinforced, and pupils are given an opportunity for further practice.

Lesson Keywords

Rivet – A permanent mechanical fastener consisting of a shaft and a head.
Fastener – A device that mechanically joins or affixes two or more objects together.
Riveting – The process of forming a permanent joint using rivets.
Joint – A connection between two or more parts.
Dolly – A tool used to support the head of a rivet while the tail is being formed.
Rivet Set – A tool used to draw the sheets together and start forming the tail of the rivet.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to research more advanced riveting techniques or specialized rivets. For those needing more support, the teacher can provide additional diagrams, simplified explanations, and closer supervision during practical observation or drawing tasks.

Note for teachers using this lesson plan

Ensure that actual rivet samples and, if possible, a simple riveting setup for demonstration are available. Emphasize safety precautions when handling tools like hammers and working with metal. Encourage pupils to ask questions and relate the lesson to real-world applications they might have seen.