Categories: Lesson Notes

JSS1 Basic Technology Lesson Note on Marking Out Tools; Measuring Tools; Driving Tools and Cutting Tools

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TOPIC: METAL WORK HAND TOOLS: MARKING OUT TOOLS, MEASURING TOOLS, DRIVING TOOLS AND CUTTING TOOLS.

CONTENTS

  1. Marking-out tools
  2. Measuring tools
  3. Driving tools
  4. 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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