Lesson Notes By Weeks and Term - Junior Secondary 1

TERM – 3^RD TERM

WEEK FOUR

Class: Junior Secondary School 1

Age: 12 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic: METALWORK HAND TOOLS I

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Describe and identify measuring tools
2. State the uses of measuring tools
3. Describe and identify marking out tools
4. State the uses of marking out tools
5. Describe and identify holding tools
6. State the uses of holding tools

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,

demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures, measuring tools, marking out tools, holding tools.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

METALWORK HANDTOOLS I

Metalworking hand tools are manual instruments designed for shaping, cutting, joining, and manipulating metal materials. These tools are generally classify into the following groups: Measuring tools, marking out tools, boring tools, holding tools and cutting tools.

Measuring Tools

Measuring hand tools in metalworking are instruments designed for accurate measurement and layout of metal materials. Common measuring hand tools for metalworking include:

1. Calipers: Used for precise measurement of distances between two points, available in various types like outside, inside, and depth calipers.

2. Micrometer: Provides highly accurate measurements of small distances or thicknesses in metal.

3. Steel Rule: Straight measuring rule made of steel, often used for linear measurements.

4. Combination Square: Combines a ruler and a right-angle measuring tool for layout and marking.

5. Scribing Tool: Used for marking precise lines on metal surfaces.

Marking out Tools

Marking out hand tools in metalworking are instruments designed for accurately indicating measurements, layout lines, and reference points on metal surfaces. Common marking out hand tools include:

1. Scribes: Pointed tools used for scratching or scoring lines onto metal surfaces.

2. Center Punch: Creates an indentation to mark the center of a hole or to start

drilling.

3. Engineer's Square: Provides a right-angle reference for marking perpendicular lines.

4. Surface Gauge: A tool with an adjustable spindle and fine adjustment for marking precise measurements on a metal surface.

5. Try Square: Similar to an engineer's square, it ensures accurate right angles during marking and layout.

6. Divider: For marking and transferring measurements, often used to scribe circles or arcs.

Holding Tools

Holding hand tools in metalworking are instruments designed to secure and stabilize metal workpieces during various machining and fabrication processes. Common holding hand tools include:

1. Vise: A mechanical device with adjustable jaws used to hold metal securely in place on a workbench or machine.

2. C-Clamp: A clamp with a C-shaped frame used to hold metal parts together during welding or other operations.

3. Magnetic Clamp: Uses magnetic force to secure metal pieces, especially useful for welding.

4. Toggle Clamp: Quickly clamps and holds workpieces in position, often used in fixtures and jigs.

5. Parallel Clamps: Long, adjustable clamps with parallel jaws, suitable for holding large and flat metal surfaces.

6. G-clamp: A versatile clamp with a G-shaped frame, used for securing metal parts during cutting, drilling, or welding.

7. Pipe Clamps: Designed for holding cylindrical metal pieces like pipes during various processes.

8. Bench Dogs: Protruding stops on a workbench used to secure metal pieces during planing, shaping, or drilling.

EVALUATION: 1. Mention 5 measuring tools and state their uses

2. Mention 5 marking out tools and state their uses
3. Mention 5 holding tools and state their uses

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively