JSS1 Third Term Basic Technology Lesson Note – Marking Out Tools; Measuring Tools; Driving Tools and Cutting Tools

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 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.

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