Lesson Notes By Weeks and Term v4 - SHS 3
ENGINEERING MATERIALS, TOOLS AND MACHINES
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
ENGINEERING MATERIALS, TOOLS AND MACHINES
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Applied Technology
Class: SHS 3
Term: 1st Term
Week: 8
Grade code: 3.2.1.LI.3
Strand code: 2
Sub-strand code: 1
Content standard code: 3.2.1.CS.1
Indicator code: 3.2.1.LI.3
Theme: METAL TECHNOLOGY
Subtheme: ENGINEERING MATERIALS, TOOLS AND MACHINES
This page supports the lesson note with a companion video and a short classroom-ready summary.
For class groups and homework, share this lesson page so learners also get the summary, objectives, and full lesson context.
This lesson introduces Computer Numerical Control (CNC) milling, a modern manufacturing technology that uses computers to control machine tools. In Ghana, as our industries grow from small-scale workshops like those in Suame Magazine to larger factories in Tema, understanding automated manufacturing is crucial. CNC technology allows us to produce high-quality, precise parts for everything from the automotive industry and agricultural machinery to the oil and gas sector. This lesson will demystify the CNC milling machine, breaking down its components and the process of turning a digital design into a physical object.
2.1 What is CNC?
CNC stands for Computer Numerical Control. Computer: A computer processor is used to read instructions and control the machine. Numerical: The instructions are in the form of numbers and codes (called G-code). Control: The computer uses these numbers to precisely control the movement and operation of the machine's tools.
Think of it like a very advanced, strong, and precise robot. You give it a set of digital instructions, and it follows them perfectly to cut or shape a material.
A CNC Milling Machine is a specific type of CNC machine that uses a rotating cutting tool to remove material from a stationary workpiece. It is used to create flat surfaces, drill holes, and cut complex shapes and profiles.