Lesson Notes By Weeks and Term v3 - Junior Secondary 1
Metal Work Hand Tools
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Metal Work Hand Tools
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Subject: Basic Technology
Class: Junior Secondary 1
Term: 3rd Term
Week: 5
Theme: Tools, Machines And Processes
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Identify the different handtools used for metalwork Describe the hand to ols; Draw sketches of the different hand to ols; and Use the hand to ols in metalwork Care and maintain metalwork hand to ols.
(Shape): Flat file, Half-round file, Round file, Triangular file, Square file.
Types (Cut): Single-cut (single rows of teeth, finer finish), Double-cut (criss-cross teeth, faster material removal), Rasp-cut (coarse, individual teeth for soft materials).
Function: Used for removing small amounts of material, smoothing rough edges, shaping, and finishing metal surfaces.
Nigerian Context: Essential for deburring newly cut metal pieces, shaping edges of fabricated parts, and achieving a smooth finish on repairs.
Cold Chisels: Description: Hand-held cutting tools made of hardened steel with a sharp cutting edge. They are struck with a hammer.
Types: Flat chisel (for general chipping, cutting rivets), Cross-cut (or Cape) chisel (for cutting keyways, grooves).
Function: Used for chipping away excess metal, cutting sheet metal, splitting nuts, and cutting off rivets or bolts.
Nigerian Context: Used in heavy fabrication, demolition, and by mechanics to remove stubborn bolts or cut through thick sections.
Snips/Shears: Description: Hand tools with two blades joined by a pivot, similar to scissors but designed for cutting sheet metal.
Types: Straight snips (for straight cuts), Bent snips (for curved cuts).
Function: Used for cutting thin sheets of metal (e.g., aluminium, galvanised iron).
Nigerian Context: Used by roofers, sign makers, and fabricators working with thin sheet metals for ductwork, cladding, or decorative purposes.
D. Striking Tools: These tools are used to apply impact force.
Hammers: Description: Tools with a heavy head (usually metal) attached to a handle.
Parts: Head (face, pein), Handle, Wedge.
Types: Ball Pein Hammer: One end of the head is flat (face), the other is spherical (ball pein).
Function: The face is used for general striking, driving chisels, and punching. The ball pein is used for riveting, shaping metal, and peening (spreading) metal.
Cross Pein Hammer: One end is flat, the other is wedge-shaped, perpendicular to the handle.
Function: Similar to ball pein, but the cross pein is useful for starting nails, shaping, and working in grooves.
Claw Hammer: (Less common in direct metalwork, but general purpose) One end is flat, the other has a 'V'-shaped claw.
Function: Primarily for driving and extracting nails in woodworking, but sometimes used for light metalwork or prying.
Nigerian Context: Ball pein hammers are essential for blacksmiths, welders, and mechanics for shaping metal, removing dents, and for riveting.
E. Miscellaneous Tools: Screwdrivers: Description: Hand tool with a tip designed to fit into the head of a screw, for turning (driving or removing) screws.
Types: Flat-head (for slotted screws), Phillips-head (for cross-recessed screws).
Function: Used for assembling or disassembling components secured by screws.
Nigerian Context: Ubiquitous in appliance repair, electronics, and general maintenance.
Spanners/Wrenches: Description: Tools with jaws designed to fit over nuts and bolts, for tightening or loosening them.
Types: Open-ended spanner, Ring spanner, Adjustable spanner (or shifting spanner).
Function: Used for applying torque to nuts and bolts.
Nigerian Context: Essential for mechanics, fitters, and anyone assembling or disassembling machines or structures with bolted connections.
F. Care and Maintenance of Metalwork Hand Tools: Proper care ensures tools last longer, remain effective, and are safe to use.
1. Cleaning: Always clean tools after use to remove dirt, grease, and metal filings. A wire brush can be used for files.
2. Oiling/Greasing: Apply a thin film of oil or grease to bare metal parts of tools (especially cutting and measuring tools) to prevent rust, particularly in Nigeria's humid climate.
3. Sharpening: Keep cutting edges of tools (chisels, snips, hacksaw blades) sharp. Replace dull or worn-out blades/files.
4. Proper Storage: Store tools in a toolbox, on a tool rack, or in a cabinet. This protects them from damage, prevents rust, and ensures they are easily found. Do not just leave them scattered on the workbench or floor.
5. Safe Handling: Use the correct tool for the job. Ensure handles are secure and not cracked. Wear appropriate Personal Protective Equipment (PPE) like safety glasses. Never use a hammer with a loose head. * Do not over-tighten a vice.
6. Reporting Damaged Tools:** Report any broken blades/files.
4. Proper Storage: Store tools in a toolbox, on a tool rack, or in a cabinet. This protects them from damage, prevents rust, and ensures they are easily found. Do not just leave them scattered on the workbench or floor.
5. Safe Handling: Use the correct tool for the job. Ensure handles are secure and not cracked. Wear appropriate Personal Protective Equipment (PPE) like safety glasses. Never use a hammer with a loose head. * Do not over-tighten a vice.
6. Reporting Damaged Tools: Report any broken or faulty tools to the teacher or workshop supervisor for repair or replacement. Metalwork hand tools are manually operated instruments designed for various tasks in working with metals, such as measuring, marking, holding, cutting, shaping, and joining. Proper understanding of each tool's function and safe usage is paramount.
A. Measuring and Marking Tools: These tools are used to accurately determine dimensions and transfer layout lines onto metal workpieces.
Steel Rule: Description: A flat, flexible or rigid strip of steel with engraved markings (millimetres, centimetres, inches).
Function: Used for measuring lengths, widths, and thicknesses of workpieces, and for marking straight lines.
Nigerian Context: Essential for artisans fabricating metal gates, windows, or measuring materials for vehicle repairs.
Try Square: Description: Consists of a thick stock (handle) and a thinner blade fixed at a 90-degree angle.
Function: Used for checking squareness of corners (ensuring 90-degree angles), and for marking lines perpendicular to an edge.
Nigerian Context: Fabricators use it to ensure frames for doors and windows are perfectly square.
Scriber: Description: A steel rod with a sharp, hardened point at one or both ends, sometimes bent at one end.
Function: Used for scratching or marking lines on metal surfaces, as pencil marks are not permanent or clear enough on metal.
Nigerian Context: Used by artisans to mark cutting or bending lines on sheet metal for various projects.
Centre Punch: Description: A hardened steel rod with a conically ground point, usually 60 or 90 degrees. It is struck with a hammer.
Function: Used to mark the exact centre of a hole to be drilled, preventing the drill bit from "walking" off centre.
Nigerian Context: Crucial for drilling accurate holes in metal plates for attaching components in machinery or furniture.
Dividers: Description: A tool with two pointed legs, joined at the top by a pivot, allowing the legs to be opened or closed to a desired distance.
Function: Used for marking circles, arcs, and for transferring measurements from a rule to a workpiece.
Nigerian Context: Used in fabricating circular components or creating decorative patterns on metal sheets.
B. Holding Tools: These tools are used to secure workpieces during various operations.
Bench Vice: Description: A heavy-duty mechanical tool mounted on a workbench, consisting of a fixed jaw, a movable jaw, and a screw mechanism operated by a handle.
Function: Used to firmly hold workpieces, preventing movement during operations like filing, sawing, drilling, or bending.
Nigerian Context: Indispensable in almost all metalwork workshops, from a small roadside mechanic to a large fabrication shop.
Pliers: Description: Hand-held gripping tools with two jaws and handles, operating on a pivot. Types include combination pliers, long-nose pliers, and cutting pliers.
Function: Used for gripping, holding small parts, bending wires, and sometimes cutting soft wires.
Nigerian Context: Electricians, mechanics, and general handymen use pliers for various tasks from wiring to extracting stubborn pins.
C. Cutting Tools: These tools are used to remove material from metal workpieces.
Hacksaw: Description: A frame with a handle, designed to hold a thin, replaceable blade with teeth.
Parts: Frame, Blade, Handle, Pin, Wing nut (for tensioning).
Function: Used for cutting metals (e.g., steel rods, pipes, angles). Blades come in different teeth per inch (TPI) for various materials.
Nigerian Context: Widely used by plumbers, fabricators, and mechanics for cutting pipes, bars, and other metal sections.
Files: Description: Hardened steel tools with parallel rows of sharp teeth. They come in various shapes and cuts.
Parts: Handle, Tang, Ferrule, Heel, Face, Edge, Point (or Tip).
Types (Shape): Flat file, Half-round file, Round file, Triangular file, Square file.
Types (Cut): Single-cut (single rows of teeth, finer finish), Double-cut (criss-cross teeth, faster material removal), Rasp-cut (coarse, individual teeth for soft materials).
Function: Used for removing small amounts of material, smoothing rough edges, shaping, and finishing metal surfaces.
Nigerian Context: Essential for deburring newly cut metal pieces, shaping edges of fabricated parts, and achieving a smooth finish on repairs.
Cold Chisels: Description: Hand-held cutting tools made of hardened steel with a sharp cutting edge.
They are Teacher Activities: Introduction (10 minutes): Teacher displays a variety of actual metalwork hand tools or high-quality images. Teacher asks students to brainstorm objects made of metal and how they might have been made or repaired, linking to the need for specific tools. Teacher introduces the topic "Metal Work Hand Tools" and states the learning objectives. Tool Identification and Description (25 minutes): Teacher systematically presents each tool (e.g., Steel Rule, Try Square, Hacksaw, Ball Pein Hammer, Bench Vice, File, Cold Chisel, Scriber, Pliers, Snips, Centre Punch, Screwdrivers, Spanners). For each tool, the teacher: Holds it up for clear visibility (or points to its image). States its name. Describes its physical characteristics (shape, material, parts). Explains its primary function and typical uses, with examples relevant to Nigeria. Demonstrates (if practical and safe) its basic operation (e.g., how to measure with a rule, hold with pliers, tension a hacksaw blade).
Sketching Guidance (15 minutes): Teacher selects a few key tools (e.g., Hacksaw, Try Square, Ball Pein Hammer) and demonstrates on the board how to draw simple, clear, and labelled sketches. Teacher emphasizes correct proportions and inclusion of essential parts.
Care and Maintenance (10 minutes): Teacher explains the importance of tool care and maintenance. Teacher outlines the proper procedures for cleaning, oiling, sharpening, and storing tools. Teacher discusses safety precautions when using tools.
Activity Supervision & Q&A (10 minutes): Teacher supervises students as they attempt to sketch tools or identify tools from a displayed collection. Teacher facilitates a Q&A session to reinforce understanding and address misconceptions.
Student Activities: Observation and Participation (20 minutes): Students observe the actual tools or images displayed by the teacher. Students actively participate in discussions, identifying tools, and suggesting their uses based on prior knowledge or observation.
Note-Taking (20 minutes): Students take detailed notes on the name, description, and function of each tool. Students make quick sketches of the tools as the teacher presents them or during dedicated sketching time.
Sketching Practice (15 minutes): Students practice drawing and labelling sketches of selected metalwork hand tools in their notebooks, following the teacher's demonstration.
Interactive Identification (5 minutes): Students volunteer to pick up a tool (if available) or point to an image and state its name and function.
Safety and Care Discussion (5 minutes): Students contribute ideas on how to care for tools and ensure safety in the workshop.
Local Fabrication and Artisanal Workshops: The understanding of metalwork hand tools is fundamental for anyone working in or interacting with local Nigerian artisans. For example, a student observing a welder fabricate a metal gate in a local market will recognize the hacksaw for cutting, the files for smoothing edges, the hammer for shaping, and the vice for holding. This knowledge demystifies the craft and highlights its economic importance in providing jobs and goods (e.g., furniture, security doors, vehicle parts).
Home and Community Maintenance: Basic knowledge of tools empowers individuals to perform minor repairs at home or in their communities. For instance, fixing a broken metal latch on a door, tightening a loose bolt on a bicycle, or straightening a bent metal component using a hammer and vice. This fosters self-reliance and reduces dependence on external labour for simple tasks, which is valuable in rural and urban settings across Nigeria.
Agriculture and Rural Development: Many agricultural implements used in Nigeria (e.g., hoes, cutlasses, plough parts) are made of metal and require periodic maintenance or repair. Understanding metalwork hand tools can help students appreciate how these tools are used to forge, sharpen, or repair farm equipment, thus linking Basic Technology directly to food security and rural livelihoods. This also applies to the repair of farm machinery like grinding mills or water pumps in remote communities.