Lesson Notes By Weeks and Term v4 - SHS 2
ENGINEERING MATERIALS, TOOLS, AND MACHINES
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ENGINEERING MATERIALS, TOOLS, AND MACHINES
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Applied Technology
Class: SHS 2
Term: 1st Term
Week: 10
Grade code: 2.2.1.LI.4
Strand code: 2
Sub-strand code: 1
Content standard code: 2.2.1.CS.1
Indicator code: 2.2.1.LI.4
Theme: METAL TECHNOLOGY
Subtheme: ENGINEERING MATERIALS, TOOLS, AND MACHINES
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Welcome, learners! Today, we are moving into one of the most important and versatile machines in any engineering workshop: the milling machine. Think about the parts needed for a corn mill, a car engine, or even the metal frame for a storefront. How are those flat surfaces, slots, and grooves made so precisely? The answer is often the milling machine. Understanding how to use this machine safely and effectively is a key skill for any future technician, engineer, or fabricator. This lesson will introduce you to the machine's major parts, its basic operations, and the vital role of cutting fluids in achieving a perfect finish.
2.1 The Milling Machine: The Master of Flat Surfaces and Slots
A milling machine is a machine tool that removes metal from a workpiece by using a rotating cutter with multiple cutting edges. Unlike a drill press, where the tool moves only up and down, the milling machine can move the workpiece in three directions (X, Y, and Z axes), allowing for the creation of flat surfaces, slots, grooves, pockets, and other complex shapes.
Think of it this way: In a pillar drill, you bring the spinning drill bit down to the stationary workpiece. In milling, you move the workpiece into the spinning cutter.
There are two main types: Vertical Milling Machine: The spindle (which holds the cutter) is vertical. This is the most common type in school workshops and is very versatile. Horizontal Milling Machine: The spindle is horizontal. It is often used for heavier cuts and cutting long slots.