The content is just an excerpt from the complete note for JSS1 Third Term Basic Technology Lesson Note – Marking Out Tools; Measuring Tools; Driving Tools and Cutting Tools. Check below to download the complete PDF
WEEK 5
TOPIC: METAL WORK HAND TOOLS: MARKING OUT TOOLS, MEASURING TOOLS, DRIVING TOOLS AND CUTTING TOOLS.
CONTENTS (i) Marking-out tools
(ii) Measuring tools
(iii) Driving tools
(iv) Cutting tools
Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)
Sub-Topic I: MARKING OUT TOOLS
These are hand tools used for marking out the required shapes of a particular metal from the sheet metal before cutting in the metal workshop. Examples are:
- Surface plate: for checking the alignment and flatness of the object.
- Surface table: this is used for marking out large objects, for checking accuracy, for height alignment and checking parallelism.
- Scriber: this is used for marking out straight lines on metals in conjunction with other marking out tools.
- Centre punch: this is used to locate the centre of a hole to be drilled.
- Dot punch: this is smaller in shape and is used to mark or dot on scribed lines.
- Trammel: this is used for marking out large diameter, where compass cannot serve.
- Marking gauge: this is re-adjustable. It is used for marking specific lines along and across the grains of the wood.
- Odd leg caliper: (Jenny’s Caliper). This is used for marking out lines parallel to an edge. It is also used for finding the centre of a round bar.
- Mortise gauge: this is used for marking out two parallel lines at a time.
To gain full access to the note: DOWNLOAD FILE
