Lesson Notes By Weeks and Term v4 - JHS 3

Lesson Video

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Performance objectives

• Identify tools and equipment for joining and assembling.
• Explain different methods of joining materials.
• Demonstrate safe use and maintenance of tools.
• Discuss how to select appropriate materials.
• Evaluate different joining techniques.

Lesson summary

This lesson introduces the fundamental concepts of joining and assembling. In our daily lives in Ghana, from the wooden benches we sit on in church to the metal gates that protect our homes and the beautiful clothes we wear, joining and assembling are essential processes. Understanding how different materials are joined together is a crucial skill for everyday problem-solving, repairs, and for future careers in trades like carpentry, welding, and fashion design. This lesson will explore the various methods, materials, and tools used to bring separate parts together to create a useful and complete product (artefact).

Lesson notes

A. What are Joining and Assembling? Joining: This is the process of fastening or connecting two or more pieces of a material together. Think of it as the single action of putting parts together. Assembling: This is the overall process of putting together all the various joined parts to create a final, complete product or artefact. Assembling includes all the joining activities.

Example: A carpenter *joins* two pieces of wood with a nail. When he joins all the pieces of wood to make a complete chair, he is *assembling* the chair. B. Types of Joints

Joints are classified based on how easily they can be taken apart. Permanent Joints: Description: These joints cannot be separated without damaging or destroying the components or the fastener. They are designed to last forever. Ghanaian Example: A welder joining two metal rods to make a burglar-proof window. You cannot separate the rods without cutting the metal. Using super glue to fix a broken ceramic bowl is also permanent. Semi-Permanent Joints: Description: These joints are not intended to be disassembled, but they can be taken apart, usually with some difficulty and potential damage to the components. Ghanaian Example: A local carpenter nailing together a wooden 'chop box'. You can remove the nails with a claw hammer, but it might damage the wood slightly. Rivets used on a metal trunk are also semi-permanent. Temporary Joints: Description: These joints are designed to be easily assembled and disassembled multiple times without damaging the components. Ghanaian Example: Using bolts and nuts to attach the legs to a table. You can use a spanner to easily remove the nuts and bolts to transport the table. Screws used to fix the handle on a door are also temporary. C. Methods of Joining, with Materials and Tools

Let's discuss the main methods used to join materials. Mechanical Fastening This method uses mechanical devices (fasteners) to hold materials together.

Evaluation guide

• B9.3.3.1
• Demonstrate
• understanding of
• materials. tools and

Reference guide

• for each identified joining method.
• Explain the appropriate joining method to use for a specific task involving wood, metal, or fabric.
• Key Concepts and Explanations
• A. What are Joining and Assembling?
• Joining: This is the process of fastening or connecting two or more pieces of a material together. Think of it as the single action of putting parts together.
• Assembling: This is the overall process of putting together all the various joined parts to create a final, complete product or artefact. Assembling includes all the joining activities.