Lesson Notes By Weeks and Term - Junior Secondary School 3

TERM: 2ND TERM

SUBJECT: BASIC TECH

CLASS: JSS 3

Reference Materials

• NERDC, INTRODUCTORY TECHNOLOGY FOR JSS, BOOK 3
• EVANS, INTRODUCTORY TECHNOLOGY FOR JSS, BOOK 3

WEEK 1

TOPIC: WOOD WORKING MACHINES

CONTENT

• Introduction 
• Wood Working Machines
• Circular Sawing Machine
• Surface Planing
• Thicknessing Machine
• Drill Press Machine
• Wood Lathe 
• Band Saw

INTRODUCTION 

Wood working machine are machines used for wood processing  and making the wood ready for use. These machines are used for heavy woodwork operation and also for mass production.

In the past, nearly all-sawing operations were carried out by hand: a lot of energy was put into it and it was more time consuming. In modern days, various machines through improved technology are now available. 

Evaluation 

1. State the reasons for using wood working machines.
2. Mention two manual wood working tools      

WOOD WORKING MACHINES

Wood working machines include the following:

1. Circular sawing machine
2. Surface planing
3. Thicknessing machine
4. Drill Press machine
5. Wood lathe 
6. Band saw

Circular Sawing Machine: This is a woodworking machine used to re-saw or prepares timber into suitable sizes for articles of joinery, furniture e.t.c.  Circular saws include the ripsaw and cross cut saw. Other special purpose saw and are fitted onto the machine as their uses arises include upper saw, hollow ground saw, ground-off saw, wobble saw or drunken saw, novelty saw, planer saw.

There are other sawing machines that can do the same job as circular sawing machine does a hand feed bench type with tilting arbor, and rise and fall attachment would be most suitable.

Band Sawing machine: T0his is a wood working machine having a compensating arrangement of a band saw that allows the upper pulley to move up and down and adjust to the changes in the saw and keep the tension of the blade constant.

Surface Planing Machine: This is a woodworking machine that enables the sawn timber to be planed to remove marks thus ensuring a flat surface.

Planing is the most laborious operations in woodworking. The introduction of the planing machines enables construction of pieces to be planed to the required thickness joining edge to edge.

Surface planing machine is used for truing up the edges, removing the marks and for removing the “wind or twist” on the face of the wood. It can also handle chamfering, beveling, tapering and tenoning.

Thicknessing Machine: This is a woodworking machine that is used exclusively for planing wood to a specific thickness after surface planing operation. 

In order to achieve a perfect operation, the front table is pulled backwards from the cutter block to allow the wood chips fly out.  

The Drill Press: This another wood working machine, which can also be used as machine tools, used for performing various operations such as boring, sanding and mortising.

Wood Lathe Machine: This is a wood working machine, which can be used for metal working operations, employed where a number of turning will be made. 

Generally, turning can be made on the lathe in two ways i.e. between centres and the faceplate- both inside and outside. The lathe bed must be sturdy. The headstock runs on double bearing which may be directly driven with about four speeds

Evaluation 

1. State 6 wood working machine
2. Differentiate between surface planing machine and Thicknessing machine
3. Draw and label the drill press.

Reading Assignment 

Read WOOD WORKING MACHINES

Reference Materials   

NERDC, Introductory Technology for JSS, book 3, pages 61- 66

EVANS, Introductory Technology for JSS, book 3, pages 111- 115

Weekend Assignment 

1. Which of the following is not a wood working machine (a) Circular sawing machine (b) Surface planing machine (c) Milling machine (d) Thicknessing 
2. A machine that is used to resaw or prepare timber into suitable sizes for articles of joinery and furniture is known as (a) Circular sawing machine (b) Surface planing machine (c) Milling machine (d) Thicknessing
3. A machine that is used exclusively for planing wood to a specific thickness after surface planing operation is called __  (a) Circular sawing machine (b) Surface planing machine (c) Milling machine (d) Thicknessing
4. A wood working machine, which can also be used as machine tools, used for performing various operations such as boring, sanding and mortising is known as (a) Drill press (b) Surface planing machine (c) Milling machine (d) Thicknessing
5. The largest wood working machine is ___  (a) Drill press (b) Wood lathe machine (c) Milling machine (d) Thicknessing

Theory 

1. Explain the functions of 6 wood working machine
2. Draw and label drill press.