Tenoning Operations with Woodworking Machines for SS 3

Class: SS 3
Term: First Term
Week: 8
Age: 16 years
Duration: 45 minutes
Subject: Machine Wood Work
Curriculum Theme: Wood Machining Operations
Previous Lesson: Wood Machining Operations and Curve Cutting
Topic: Wood Machining: Tenoning Operations with Woodworking Machines
Subject Matter: Machine operation of tenoning

Specific Objectives

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

Cognitive Domain

• Define tenoning in machine woodworking.
• Identify the main parts of a tenoning machine.
• Describe the step-by-step procedure for tenoning operations.

Psychomotor Domain

• Demonstrate the correct and safe operation of a tenoning machine.
• Properly use safety devices during tenoning operations.

Affective Domain

• Appreciate the importance of safety precautions when operating woodworking machines.
• Work carefully and precisely during practical tenoning tasks.

Reference Materials

The following resources were used in planning this lesson:

• 2025 Revised 9 Years Basic Education Curriculum
• Relevant State Unified Scheme of Work
• Woodworking Technology textbooks for Senior Secondary School
• The HeadTeacher Scheme of work

Instructional Materials

The teacher will teach this lesson with the aid of:

• A functional tenoning machine
• Wood samples for tenoning
• Safety goggles
• Push sticks
• Measuring tape/ruler
• Pencils
• Dust extractor (if available)

Rationale for the Lesson

This lesson is essential as it equips students with the practical skills required for accurate and safe tenoning operations using woodworking machines. Mastering tenoning is fundamental for constructing strong and precise wood joints, which is a core skill in advanced woodworking and carpentry. It also reinforces the critical importance of machine safety in a workshop environment.

Prerequisite/Previous Knowledge

Students should have basic knowledge of different woodworking machines, workshop safety rules, and the concept of wood joints from previous lessons.

Lesson Content/Board Summary

Wood Machining: Tenoning Operations with Woodworking Machines

Definition of Tenoning

Tenoning is a woodworking operation that involves cutting a rectangular projection (called a tenon) on the end of a piece of wood. This tenon is designed to fit snugly into a corresponding mortise (a rectangular hole) in another piece of wood, forming a strong mortise and tenon joint.

Types of Tenoning Machines

The most common machine used for cutting tenons in a school workshop is the tenoning machine, often a dedicated machine or a spindle moulder/router with specific tooling.

Main Parts of a Tenoning Machine

A typical tenoning machine consists of several key parts:

1. Machine Table: The flat surface on which the workpiece rests.
2. Fence: Guides the workpiece to ensure straight and accurate cuts.
3. Clamping Device: Holds the workpiece firmly in place during cutting.
4. Cutting Heads/Blades: Specialized cutters designed to shape the tenon. These can be saw blades, grooving cutters, or a combination.
5. Motor: Powers the cutting heads.
6. Control Panel: Contains start/stop buttons and other operational controls.
7. Guard: A safety cover to protect the operator from moving parts and flying debris.
8. Depth Adjustment: Mechanism to control the thickness and length of the tenon.

Procedure for Tenoning Operations

The general steps for operating a tenoning machine to cut a tenon include:

1. Preparation:
   1. Ensure the machine is clean and in good working order.
   2. Wear appropriate personal protective equipment (PPE), especially safety goggles.
   3. Select the correct cutting heads and adjust them for the required tenon thickness and length.
   4. Adjust the fence to guide the workpiece accurately.
   5. Perform a test cut on a scrap piece of wood to verify settings.
2. Workpiece Setup:
   1. Mark the tenon dimensions accurately on the workpiece.
   2. Position the workpiece firmly against the fence and secure it with the clamping device.
3. Cutting the Tenon:
   1. Switch on the machine and allow the cutting heads to reach full speed.
   2. Carefully feed the workpiece into the cutting heads, maintaining firm pressure against the fence.
   3. Guide the workpiece smoothly through the cut, avoiding sudden movements.
   4. Once the cut is complete, switch off the machine and wait for the cutters to stop before removing the workpiece.
4. Inspection:
   1. Inspect the cut tenon for accuracy, smoothness, and correct dimensions.
   2. Repeat the process for all required tenons, rechecking settings periodically.

Safety Devices and Precautions

Safety is paramount when operating tenoning machines:

1. Guards: Always ensure all machine guards are in place and properly adjusted.
2. Clamping Devices: Use clamps to secure the workpiece, preventing kickback and ensuring stable cutting.
3. Push Sticks/Hold-downs: Use push sticks for small workpieces to keep hands away from cutting heads.
4. Emergency Stop Button: Know the location of the emergency stop button and how to use it.
5. Personal Protective Equipment (PPE): Always wear safety goggles, hearing protection, and appropriate clothing.
6. Machine Maintenance: Regularly check that cutters are sharp and securely fitted.
7. Clear Work Area: Keep the area around the machine clear of debris and obstructions.
8. No Loose Clothing/Jewellery: Avoid loose clothing, long hair, or jewellery that could get caught in moving parts.
9. Never Force a Cut: Allow the machine to do the work; forcing a cut can lead to kickback or damage.

Teaching Methods/Instructional Techniques

Demonstration, Explanation, Guided Practice, Question and Answer, Observation, Practical Activity.

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Recalling/Engaging

Teacher’s Activity: The teacher greets the students and reviews the previous lesson on general woodworking machine safety. The teacher then introduces the concept of tenoning and its importance in joinery, asking students if they have seen mortise and tenon joints before.

Pupils’ Activity: Students respond to questions and share their prior knowledge about woodworking machines and joints.

Learning Point: Introduction to tenoning

Step 2: Definition of Tenoning

Time: 7 minutes

Teaching Skill: Explaining/Defining

Teacher’s Activity: The teacher defines tenoning and explains its purpose in creating strong wood joints, using visual aids or pre-cut samples of tenons and mortises. The teacher also briefly mentions the common types of machines used for tenoning.

Pupils’ Activity: Students listen attentively, ask clarifying questions, and observe the samples.

Learning Point: Meaning of tenoning

Step 3: Identifying Tenoning Machine Parts

Time: 8 minutes

Teaching Skill: Identification/Labelling

Teacher’s Activity: The teacher points to a tenoning machine (or a diagram/picture) and identifies its main parts, explaining the function of each part, such as the table, fence, clamping device, and cutting heads.

Pupils’ Activity: Students observe, listen, and identify the parts of the tenoning machine as explained by the teacher.

Learning Point: Tenoning machine parts

Step 4: Explaining Tenoning Procedure

Time: 7 minutes

Teaching Skill: Describing/Sequencing

Teacher’s Activity: The teacher describes the step-by-step procedure for setting up the machine and cutting a tenon, from marking the workpiece to making the cut and inspecting the result. The teacher emphasizes precision in measurements and settings.

Pupils’ Activity: Students listen and mentally follow the steps, noting down key stages of the operation.

Learning Point: Tenoning operation steps

Step 5: Practical Demonstration of Tenoning Operation

Time: 8 minutes

Teaching Skill: Demonstrating/Modelling

Teacher’s Activity: The teacher performs a live demonstration of the tenoning operation on a wood sample, carefully following all safety procedures and explaining each step as it is performed. The teacher ensures students have a clear view.

Pupils’ Activity: Students observe the demonstration closely, paying attention to the teacher’s technique and safety practices.

Learning Point: Practical tenoning demonstration

Step 6: Emphasizing Safety Devices and Precautions

Time: 5 minutes

Teaching Skill: Reinforcing/Warning

Teacher’s Activity: The teacher highlights the various safety devices on the tenoning machine and reiterates critical safety precautions that must be followed during operation, such as wearing PPE, using guards, and proper clamping.

Pupils’ Activity: Students listen and ask questions about specific safety measures, understanding their importance.

Learning Point: Importance of safety devices

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. What is tenoning?
2. Mention three main parts of a tenoning machine.
3. List two safety precautions to observe when operating a tenoning machine.
4. Briefly describe one step in the tenoning operation.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Understanding tenoning operations

Step 8: Note-Taking

Time: 4 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on tenoning operations and safety into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson notes

Step 9: Conclusion

Time: 1 minute

Teaching Skill: Summarizing/Concluding

Teacher’s Activity: The teacher briefly summarizes the lesson by reminding students of the importance of accurate tenoning and strict adherence to safety rules in machine woodworking. The teacher encourages students to practice these skills responsibly.

Pupils’ Activity: Students listen and prepare for the next lesson.

Learning Point: Reinforcement of tenoning

Continuous Assessment/Further Study

Type: Homework

Instruction: Answer the following questions in your notebook:

1. Draw and label any four parts of a tenoning machine.
2. Explain in your own words why safety goggles are essential when operating a tenoning machine.
3. Research and briefly describe one other type of wood joint that can be made using a machine.

Lesson Keywords

• Tenoning – The process of cutting a tenon on a workpiece.
• Tenon – A projecting piece of wood formed on the end of a rail or stile for insertion into a mortise.
• Mortise – A hole or recess cut into a piece of wood to receive a tenon.
• Fence – A guide on a woodworking machine that helps to keep the workpiece straight during cutting.
• Kickback – A sudden, violent reaction where a workpiece is thrown back towards the operator by a rotating cutter.
• PPE – Personal Protective Equipment, such as safety goggles, ear protection, and gloves.

Differentiation

For learners who grasp the concepts quickly, challenge them to identify different types of tenons (e.g., haunched tenon, through tenon) and discuss their applications. For learners who need more support, provide additional one-on-one guidance during the practical demonstration and allow them to practice on scrap wood under close supervision before attempting the main task.

Suggested Lesson Videos

For further visual learning, search on YouTube for: “tenoning machine operation woodworking” or “how to cut tenons on spindle moulder”.

Teacher Guide for Using This Lesson Plan

Before the lesson, ensure the tenoning machine is fully functional, properly set up, and all safety guards are in place. Have various wood samples ready, including some pre-cut tenons and mortises for demonstration. Begin by reviewing basic workshop safety, as this lesson involves machine operation. During the demonstration, speak clearly and slowly, highlighting each step of the tenoning process and emphasizing safety precautions. Encourage students to ask questions throughout the demonstration. For the practical activity, supervise closely, ensuring every student wears appropriate PPE and follows safety protocols. Allow students to copy the Board Summary notes after the evaluation to consolidate their learning. Pay attention to common errors such as incorrect machine settings, improper workpiece clamping, and neglecting safety devices. Provide immediate feedback and correction. For advanced learners, discuss the precision required for tight-fitting joints and the impact of cutter sharpness. For struggling learners, offer additional hands-on guidance and simplify the tasks where possible, focusing initially on safe machine handling.