Lesson Notes By Weeks and Term v4 - SHS 3

Lesson Video

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Performance objectives

• Identify and describe the parts of five key woodworking machines.
• Explain the uses of each machine.
• Understand proper care and maintenance practices.
• Learn to select the right machine for a specific task.

Lesson summary

In Ghana, the woodwork and furniture industry is a major source of employment and entrepreneurship, from the local carpenter in our community making "konkonsa" benches and roofing trusses, to large factories in Accra or Kumasi producing fine furniture for export. To be successful and safe in this industry, one must move beyond hand tools to master the use of powerful machines. This lesson introduces you to five essential woodworking machines that increase speed, accuracy, and the range of creative possibilities. Understanding how to choose the right machine for the job, use it safely, and maintain it well is a critical skill for any modern wood technologist.

Lesson notes

Introduction to Woodworking Machines

Woodworking machines are power-driven tools designed to perform specific operations on wood with greater speed, power, and precision than hand tools. Proper use requires skill, knowledge, and a strict adherence to safety rules.

The Mortising/Drilling Machine

A mortising machine is a specialized tool used to cut square or rectangular holes in a piece of wood. These holes are called mortises, which typically receive a matching tenon to form a strong mortise-and-tenon joint. Key Parts and their Functions: Motor Head: Houses the electric motor that powers the machine. Hollow Chisel: A square, hollow steel chisel. Inside it is an auger bit. Auger Bit: A drill bit that sits inside the hollow chisel. It rotates to clear out most of the waste wood. Chisel & Bit Assembly: The auger bit drills a round hole, and the sharp edges of the stationary chisel square it off as the assembly is plunged into the wood. Work Table: A flat surface where the workpiece is placed. Fence: An adjustable guide against which the workpiece is held to ensure cuts are parallel to the edge. Hold-down Clamp: Secures the workpiece firmly to the table to prevent it from lifting when the chisel is withdrawn. Depth Stop: An adjustable rod that limits how deep the chisel can plunge, ensuring all mortises are of a uniform depth. Operating Handle: A long lever used by the operator to lower the chisel assembly into the wood. Uses: Cutting mortises for furniture (e.g., chair legs, table frames). Making joints for door and window frames. Any application requiring a strong, neat, square-holed joint. Safety: Always clamp the workpiece securely. Ensure the chisel is sharp and properly set. Keep hands clear of the cutting area. Wear safety goggles.

Evaluation guide

• Use an appropriate machine for a specific operation independently
• Group work/Collaborative Learning: Guide learners in mixed ability groups to co -
• operatively and passionately identify the following machines:
• Mortising/Drilling Machine