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WEEK:  8 (EIGHT).        Â
CLASS:Â JSS TWO
TOPIC: METALWORKÂ MACHINES.
SUB-TOPIC:
- Types of metalwork machines.
- Functions of the different types of machines.
Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)
A machine tool is a machine that cut metals and performs some other operations by manipulation of its parts. The five basic machine tools are:
- Lathe
- Shaper and planer
- Milling machine
- Grinding machine
- Drill press
THE MILLING MACHINE
It is of two kinds; the vertical and horizontal milling machine. It can be used to perform what is called up-cut or down-cut. Using either method, the machine is used to:
- Cut gear
- Cut grooves
- Cut splints.
MILLING MACHINE
DRILL PRESS
Drill press is used for boring or drilling holes in thick metals whose diameter is beyond 25mm. The drill press has its essential features:
- An electric motor which drives the drill
- A variable vee -belt that can be changed to select different speed
- A hand lever controlling the up and down movement of the drill
- An adjustable tilting table
- The chucks
POWER SAWING MACHINE
The main feature is the power saw blade which is powered by an oscillating mechanism that drives the blade across the rigidly gripped work piece. It is used for cutting metals.
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