Lesson Notes By Weeks and Term v3 - Senior Secondary 2
Ironmonogery
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Ironmonogery
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Subject: Carpentary And Joinery
Class: Senior Secondary 2
Term: 2nd Term
Week: 3
Theme: Types And Uses Of Materials
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Identify, name and state the uses of various types of ironmongery. Sketch and fix various ironmongery. Make specifications for or dering common ironmongery.
Types And Uses Of Materials the correct fasteners for strength and aesthetics, identify suitable locks for security, and specify hinges for smooth operation. This directly supports the craftsmanship and quality control in local furniture production, making students valuable assets to workshops or enabling them to start their own businesses.
3. Security Solutions and Entrepreneurship: The understanding of different lock types (mortise, rim, padlock) and their mechanisms is critical for home and business security in Nigeria. Students can apply this knowledge not just in installation but also in advising clients on appropriate security measures. This can lead to entrepreneurial ventures in security installation, repair, and locksmith services, a field with consistent demand due to general security concerns across the country. For instance, knowing how to specify and install a robust mortise lock for an apartment door or selecting a heavy-duty padlock for a shop can significantly enhance safety for individuals and businesses.
8. Differentiation, Remediation and Extension Differentiation and Remediation (Supporting Struggling Learners): Visual Aids and Tactile Learning: Provide simplified, large diagrams of core ironmongery items with clear labels. Allow struggling learners to handle and examine physical samples extensively, linking the physical item to its name and use. Use flashcards for matching names to pictures.
Focused Practice: Reduce the number of items for identification and sketching. Focus on 3-4 most common items (e.g., common nail, wood screw, butt hinge, padlock).
Pre-drawn Templates: For sketching tasks, provide pre-drawn outlines or partially completed sketches that students can complete and label, reducing the initial complexity of drawing from scratch.
Peer Support: Pair struggling learners with more advanced students for group activities, allowing for peer tutoring and collaborative learning.
Simplified Language: When explaining concepts, use simpler language and shorter sentences, breaking down complex procedures into very small, manageable steps.
Repetitive Practice: Offer additional practice sheets for identifying items and stating their uses, possibly with multiple-choice options. Extension and Enrichment (Challenging High-Achieving Learners): Research Project: Task advanced students to conduct a mini-research project on specialized or advanced ironmongery.
Examples include: Concealed Hinges (e.g., European hinges for kitchen cabinets): How do they work, their advantages, and installation challenges.
Specialised Locks: Multi-point locking systems for security doors, smart locks (digital/biometric), or specific commercial door hardware.
Fastener Technology: Researching modern fasteners like structural screws, pocket hole screws, or specific types of anchors for different substrates (e.g., concrete anchors for heavy loads in Nigerian blockwork).
Material Science: Investigate different materials for ironmongery (e.g., brass vs. stainless steel vs. zinc-plated mild steel) in terms of corrosion resistance, strength, and cost-effectiveness in Nigeria's climate and economy.
Design and Specification Challenge: Present students with a complex carpentry project scenario (e.g., "Design a custom built-in wardrobe with drawers and hinged doors for a client, considering durability and aesthetics").
Challenge them to: List all the ironmongery needed. Prepare detailed specifications for each item. Justify their choice of specific ironmongery based on functionality, aesthetics, budget, and local availability in Nigeria. Estimate the quantity and approximate cost of the ironmongery from a local supplier. * Problem-Solving and Innovation: Present a common carpentry problem related to ironmongery failure (e.g., "A heavy school gate sags because its hinges failed," "A cabinet door keeps falling off"). Students should analyze the possible causes (e.g., incorrect hinge type, poor fixing, low-quality material) and propose a durable and practical solution, potentially involving innovative uses of existing ironmongery or suggesting improvements.
Ironmongery Term: 2nd Term Week: 5 ---
1. Overview and Learning Objectives This topic introduces students to ironmongery, which refers to the various metal hardware items used in carpentry and joinery. Understanding ironmongery is fundamental for any carpenter or woodworker, as these components are essential for the functionality, durability, security, and aesthetics of wooden structures, furniture, doors, and windows. In the Nigerian context, from the construction of new homes and schools to the repair of existing furniture and public infrastructure, ironmongery plays a critical role. Proficiency in identifying, specifying, and correctly fixing these items directly impacts the quality and longevity of carpentry projects, enhancing employability and entrepreneurial opportunities for students in the construction and furniture-making sectors across Nigeria. Upon completion of this lesson, students will be able to: Identify and name various types of ironmongery commonly used in carpentry, and accurately state their specific functions and applications. Accurately sketch common types of ironmongery and demonstrate the correct procedures for fixing them onto wooden components. Prepare precise and comprehensive specifications for ordering common ironmongery items for various carpentry projects.
2. Key Concepts and Explanations Definition of Ironmongery: Ironmongery refers to the collection of metal hardware items or fittings manufactured from iron or other metals (e.g., brass, steel, bronze, aluminum) that are used in building construction, especially in carpentry and joinery. These items serve crucial functions such as fastening, joining, supporting, operating (e.g., opening/closing), and securing wooden components. They are vital for enhancing the strength, functionality, security, and aesthetic appeal of doors, windows, gates, cabinets, and furniture.
Categories of Ironmongery: Ironmongery can be broadly categorised based on their primary function:
1. Fasteners: Used to join or hold wooden parts together (e.g., screws, nails, bolts).
2. Operating Mechanisms: Allow movement or control of parts (e.g., hinges, catches).
3. Security Devices: Used to restrict access or secure items (e.g., locks, latches, padlocks).
4. Support and Decorative: Provide structural support or aesthetic enhancement (e.g., brackets, handles). Detailed Explanation of Specific Ironmongery Types: A. Screws Screws are threaded fasteners designed to be driven into wood to create a strong, removable joint. They are more secure than nails and allow for disassembly without damage.
Types of Screws:
1. Wood Screw: Specifically designed for use with wood. It has a coarse thread that tapers to a point, allowing it to cut its own thread in the wood.
Common Head Types: Flat Head (Countersunk): Sinks flush with the wood surface. Ideal when a smooth finish is desired.
Round Head: Sits proud of the surface. Often used for decorative purposes or when extra grip is needed.
Oval Head: Combines features of flat and round heads, partially countersinks and has a decorative dome.
Pan Head: Similar to round but with a flatter, wider top.
Common Drive Types: Slotted: Single straight slot.
Philips: Cross-shaped recess, provides better grip for the screwdriver, reducing cam-out.
Pozidriv: Similar to Philips but with additional smaller slots for even better grip.
Torx (Star Drive): Six-point star-shaped recess, offering excellent torque transfer and minimal cam-out.
2. Lag Screw (Coach Screw): A heavy-duty screw with a hexagonal head, designed for structural timber connections where high strength is required. It's driven with a wrench or spanner. It requires a pilot hole significantly smaller than the shank, and a clearance hole for the unthreaded portion.
3. Self-tapping Screw (Sheet Metal Screw): While primarily for metal, some types are used to attach thin metal components to wood or in certain hardwood applications. They have a sharper, hardened thread that can cut its own thread without a pilot hole in thinner materials, but pilot holes are recommended for wood. (Other types like drywall screws are used for attaching plasterboard to timber studs, relevant in some carpentry contexts)
Uses of Screws: Joining furniture components (cabinets, tables, chairs). Fixing hinges, catches, and other hardware. Attaching wall panels and cladding. Structural connections in timber framing (lag screws).
Sketching Screws: When sketching, represent the head type (flat, round, hex), the shank (unthreaded part), and the threaded portion clearly. Indicate the point. * Fixing Screws:
1. Marking Out: Mark the in thinner materials, but pilot holes are recommended for wood. (Other types like drywall screws are used for attaching plasterboard to timber studs, relevant in some carpentry contexts)
Uses of Screws: Joining furniture components (cabinets, tables, chairs). Fixing hinges, catches, and other hardware. Attaching wall panels and cladding. Structural connections in timber framing (lag screws).
Sketching Screws: When sketching, represent the head type (flat, round, hex), the shank (unthreaded part), and the threaded portion clearly. Indicate the point.
Fixing Screws:
1. Marking Out: Mark the exact position for the screw.
2. Pilot Hole: Drill a pilot hole slightly smaller than the core diameter of the screw's threaded part (for wood screws) to prevent splitting the wood and make driving easier. For the unthreaded shank, a clearance hole (same diameter as the shank) should be drilled through the top piece of wood to allow the screw to pull the two pieces tightly together.
3. Countersinking/Counterboring: For flat-head screws, countersink the hole so the head sits flush or below the surface. For round heads, counterbore if a hidden or flush finish is desired, then plug the hole.
4. Driving: Use an appropriate screwdriver or power drill with the correct bit. Apply steady pressure while driving the screw to avoid stripping the head.
Specification for Ordering Screws: A complete specification includes: Item Name: (e.g., Wood Screw)
Head Type: (e.g., Flat Head, Round Head)
Drive Type: (e.g., Slotted, Philips, Torx)
Material: (e.g., Brass, Stainless Steel, Mild Steel)
Finish: (e.g., Polished, Zinc Plated, Black Phosphate)
Size: Length (e.g., 2.5 inches) and Gauge (diameter, e.g., No. 10). Gauge numbers are standardised (e.g., No. 6, 8, 10, 12).
Quantity: (e.g., 1 gross, 2 boxes of 100, 500 pieces).
Example: "WOOD SCREW, Flat Head, Philips Drive, Brass, Polished, 2.5 inches length, 10 gauge diameter.
Quantity: 2 gross (288 pieces)." B. Locks Locks are mechanical fastening devices that are released by a physical key or other means (e.g., code, fingerprint). They provide security for doors, windows, drawers, and cabinets.
Types of Locks:
1. Mortise Lock: A lock that is fitted into a rectangular recess (mortise) cut into the edge of a door. It typically consists of a latch (spring-loaded bolt) and a deadbolt (solid bolt for security), operated by a handle and a key. These are common for main entrance doors in Nigerian homes.
2. Rim Lock (Surface Mounted Lock): A lock that is fitted directly onto the surface of the door, usually on the inside. It is simpler to install than a mortise lock but is visibly mounted. Often used for interior doors or as a secondary lock.
3. Cylinder Lock (Pin Tumbler Lock): A lock where the key operates a rotating cylinder containing pins. This mechanism is often integrated into mortise or rim locks (e.g., a 'deadlock cylinder'). It can also be a standalone deadlock.
4. Padlock: A portable, detachable lock, not permanently fixed to a structure. It is used in conjunction with a hasp and staple to secure gates, sheds, storage boxes, etc. Extremely common in Nigeria for various security needs.
Uses of Locks: Securing main entrance doors and interior doors of homes, offices, and public buildings. Protecting valuable items in cabinets and drawers. Securing gates, sheds, and containers.
Sketching Locks: For a mortise lock, sketch the main case, the faceplate, the latch bolt, and the deadbolt. For a padlock, show the body and the shackle. Fixing Locks (General Steps for Mortise Lock):
1. Marking Out: Mark the position of the lock body, faceplate, spindle hole, and keyhole on the door edge and face.
2. Mortising: Carefully cut the rectangular mortise into the door edge for the lock body using a chisel or router.
3. Drilling: Drill holes for the spindle (handle) and keyhole.
4. Fitting: Insert the lock body, attach the faceplate, and fit the handles and key cylinder.
5. Strike Plate: Mark and mortise the strike plate on the door frame/jamb to receive the latch and deadbolt.
6. Testing: Test the lock functionality thoroughly.
Specification for Ordering Locks: * Item Name: (e.g.,