Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 2nd Term
Week: 9
Age: 15 years
Duration: 45 minutes
Subject: Metal Work
Curriculum Theme: Pre-Vocational Studies
Previous Lesson: Marking Out Tools and Marking a Metal Workpiece.
Topic: Cutting Tools
Subject Matter: Cutting tools such as hacksaw, chisels, files, scraper, taps and dies.

Specific Objectives

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

Cognitive Domain:

Define cutting tools.
List different types of cutting tools.
State the uses of hacksaw, chisels, files, scraper, taps, and dies.
Explain the purpose of taps and dies in threading.

Affective Domain:

Appreciate the importance of using appropriate cutting tools for specific tasks.
Show interest in learning safe handling procedures for cutting tools.

Psychomotor Domain:

Correctly identify different cutting tools.
Demonstrate basic handling of a hacksaw, file, and chisel.

Work collaboratively with peers during practical identification of tools.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Technology (Metal Work Section)
State Unified Scheme of Work for Senior Secondary Metal Work
Basic Metalwork for Senior Secondary Schools by A.O. Ajetunmobi

Instructional Materials

The teacher will teach this lesson with the aid of:

Actual hacksaw, chisels, files, scrapers, taps and dies
Sample metal pieces
Whiteboard/Chalkboard and markers/chalk

Rationale for the Lesson

This lesson helps pupils understand how different tools are used to shape and modify metal. Knowing about cutting tools and their uses is important for carrying out practical metalwork tasks safely and effectively, which prepares them for future technical skills.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of common hand tools and general workshop safety rules.

Lesson Content/Board Summary

Cutting Tools

Definition of Cutting Tools

Cutting tools are hand or machine tools designed to remove unwanted material from a workpiece to achieve a desired shape, size, or finish. They work by shearing, abrading, or tearing away material.

Types of Cutting Tools and Their Uses

The following are common cutting tools and their uses:

Hacksaw: Used for cutting various types of metal, such as bars, pipes, and sheets. It consists of a frame and a replaceable blade with teeth.
Chisels: Used for cutting, shaping, and removing excess metal. They are typically made of hardened steel with a sharp cutting edge and are struck with a hammer.
Files: Used for removing small amounts of metal, smoothing rough surfaces, deburring, and shaping workpieces. Files come in various shapes (flat, round, half-round) and cuts (single-cut, double-cut).
Scraper: Used for removing burrs, cleaning surfaces, and achieving fine surface finishes on metal.

Taps and Dies for Threading

Taps and dies are specialized cutting tools used to create screw threads:

Taps: Used to cut internal threads (female threads) inside a hole, allowing a bolt or screw to be fitted.
Dies: Used to cut external threads (male threads) on the outside of a rod or pipe, allowing it to be screwed into a threaded hole or nut.

Teaching Methods/Instructional Techniques

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

Instructional Procedures

Step 1: Introduction

Time: 3 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to mention any tools they know that are used to cut or shape materials in everyday life. The teacher then introduces the topic, “Cutting Tools” in Metal Work.
Pupils’ Activity: Pupils respond by mentioning tools like knives, scissors, saws (for wood). They listen attentively to the topic introduction.
Learning Point: Pupils recall prior knowledge of cutting tools and are prepared for the lesson.

Step 2: Definition of Cutting Tools

Time: 5 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher explains what cutting tools are, emphasizing their function in removing material to achieve desired shapes and sizes. The teacher writes the definition on the board.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification.
Learning Point: Pupils understand the general concept and purpose of cutting tools.

Step 3: Types of Cutting Tools and Their Uses (Hacksaw, Chisels, Files, Scraper)

Time: 10 minutes
Teaching Skill: Elucidation/Demonstration
Teacher’s Activity: The teacher presents the hacksaw, chisels, files, and scraper, showing each tool to the pupils. For each tool, the teacher states its specific use and highlights its key features. The teacher writes the name of each tool and its use on the board.
Pupils’ Activity: Pupils observe the tools, listen to the explanations, and note down the types and their uses.
Learning Point: Pupils learn to identify and state the uses of common metal cutting tools.

Step 4: Taps and Dies for Threading

Time: 7 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher introduces taps and dies, explaining their specialized function in creating internal and external threads. The teacher shows actual taps and dies and, if possible, demonstrates how they are used with a small sample. The teacher writes the definitions and uses on the board.
Pupils’ Activity: Pupils observe the tools, listen to the explanation of threading, and take notes.
Learning Point: Pupils understand the function of taps and dies in creating threads.

Step 5: Demonstration of Basic Handling

Time: 8 minutes
Teaching Skill: Demonstration/Practical Application
Teacher’s Activity: The teacher demonstrates the correct way to hold and position a hacksaw for cutting, a file for smoothing, and a chisel for light cutting on a sample metal piece. The teacher emphasizes safety precautions.
Pupils’ Activity: Pupils carefully observe the teacher’s demonstration, paying attention to grip, posture, and safety.
Learning Point: Pupils observe proper handling techniques and safety measures for cutting tools.

Step 6: Practical Identification and Handling

Time: 5 minutes
Teaching Skill: Practical Application/Guided Practice
Teacher’s Activity: The teacher distributes the tools (or passes them around) and guides pupils to correctly identify each tool. The teacher allows pupils to practice holding the hacksaw, file, and chisel under supervision.
Pupils’ Activity: Pupils handle the tools, identify them, and practice holding them as demonstrated by the teacher.
Learning Point: Pupils gain hands-on experience in identifying and handling cutting tools.

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 cutting tools.
List four types of cutting tools mentioned in the lesson.
State one use for a hacksaw and one use for a file.
Explain the difference between a tap and a die.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the importance of selecting and using the correct cutting tool safely for different metalwork tasks. The teacher assigns homework: “Draw and label any three cutting tools discussed today.”
Pupils’ Activity: Pupils listen to the summary and copy the homework assignment.
Learning Point: The lesson is reinforced, and pupils are given an opportunity to practice their learning.

Lesson Keywords

Cutting Tools – Tools used to remove material from a workpiece.
Hacksaw – A hand tool used for cutting metal.
Chisel – A tool with a sharp edge used for cutting or shaping metal, often struck with a hammer.
File – A hand tool with abrasive ridges used for smoothing, shaping, or removing small amounts of material from workpieces.
Scraper – A tool used for removing burrs or achieving fine surface finishes.
Tap – A tool used to cut internal threads in a hole.
Die – A tool used to cut external threads on a rod or pipe.
Threading – The process of creating screw threads on a material.

Differentiation

For pupils who grasp concepts quickly, the teacher can encourage them to research other types of cutting tools not covered in the lesson. For pupils needing more support, the teacher can provide additional one-on-one guidance during the practical identification and handling session.

Note for teachers using this lesson plan

Ensure all tools are readily available and in good working condition for the demonstration and practical sessions. Emphasize safety precautions at every stage, especially when pupils are handling tools. Encourage active participation and questions to foster a deeper understanding of the subject matter.