Lesson Notes By Weeks and Term v3 - Senior Secondary 2
Project design and drawing
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Project design and drawing
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Subject: Wood-Work
Class: Senior Secondary 2
Term: 1st Term
Week: 8
Theme: Design And Construction
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Design functional furniture items to meet given design problems Make preliminary freehand sketches of different designs of the same furniture items Prepare working drawing in the First and Third Angle Projections Exhibit good draftsmanship skills Prepare working drawings and bill of materials Show appropriate construction details
The design process is a systematic approach to problem-solving, leading to the creation of a functional and aesthetic wooden product.
Problem Identification and Analysis: This involves understanding the client's needs, the intended use of the furniture (e.g., a school desk, a market stall bench), the user (age, ergonomics), space constraints, budget, and desired aesthetics.
Example: A client needs a durable, compact dining table for a small family living in a self-contained apartment in Lagos. The table should accommodate four people, be easy to clean, and fit into a 2m x 2m dining area.
Research and Ideation: Exploring existing designs, materials, and construction methods. Brainstorming multiple solutions to the identified problem. This phase often involves looking at furniture catalogs, visiting local markets (e.g., Ladipo or Mushin furniture markets), and online research.
Preliminary Freehand Sketches: Quick, rough drawings used to explore and visualize various design ideas. These are not to scale but aim to capture the form, proportion, and functionality of potential solutions. Multiple sketches are encouraged to avoid premature commitment to a single idea. Sketches often include basic annotations of ideas for materials or features.
Example: For the compact dining table, sketches might explore a square top with four straight legs, a round top with a central pedestal, or a foldable design.
Refinement and Selection: Critically evaluating the preliminary sketches based on criteria like functionality, aesthetics, material cost, ease of construction, and client feedback. The most promising design is selected for further development.
Working Drawing and Documentation: Developing detailed technical drawings from the selected design, including orthographic projections, dimensions, and necessary lists for construction. A working drawing is a complete graphical and textual description of a product, providing all the necessary information for its manufacture or assembly. It serves as a blueprint for the woodworker.
Components of a Working Drawing: Orthographic Projections: Multiple 2D views (Front, Top, Side) of the object, showing its shape and features from different angles.
Dimensions: Numerical values indicating the size of features and their locations.
Notes: Textual information about materials, finishes, special instructions, or tolerances.
Title Block: Contains essential project information (project name, drawing title, scale, date, drawn by, checked by).
Bill of Materials (BOM): A comprehensive list of all components (wood, hardware, finishes) required.
Cutting List: A detailed list of all wooden components, their finished dimensions, and quantity.
Construction Details: Enlarged views of complex joints or assembly methods. Orthographic projection is a method of representing a 3D object in 2D by showing its views from different angles. The two primary methods are First Angle and Third Angle Projection.
A. First Angle Projection: Concept: The object is imagined to be in the "first quadrant" (between the observer and the projection planes). The views are projected onto planes behind the object. The standard symbol for First Angle Projection is a truncated cone with the smaller circle on the left.
Layout of Views: The Front View is typically placed in the lower-left area of the drawing sheet. The Plan View (Top View) is placed below the Front View. The Right Side View (End View) is placed to the left of the Front View. The Left Side View would be placed to the right of the Front View.
Reasoning: You "push" the view through the object onto the plane behind it. So, looking from the top, the view appears below the front view. Looking from the right, the view appears to the left of the front view.
Application: Widely used in Europe, Asia, and countries following British standards, including Nigeria in some technical fields, though Third Angle is often more intuitive for construction.
B. Third Angle Projection: Concept: The object is imagined to be in the "third quadrant" (the projection planes are between the observer and the object). The views are projected onto planes between the observer and the object. The standard symbol for Third Angle Projection is a truncated cone with the smaller circle on the right.
Layout of Views: The Front View is typically placed in the lower-left or central area of the drawing sheet. The Plan View (Top View) is placed above the Front View. The Right Side View (End View) is placed to the right of the Front View. The Left Side View would be placed to the left of the Front View.
Reasoning: The views are placed in the same relative position as the observer's viewing direction. Looking from the top, the view is drawn above. Looking from the right, the view is drawn to the right.
Application: Commonly used in the USA, Canada, and for architectural and woodworking drawings due to its more intuitive layout. Good draftsmanship ensures clarity, accuracy, and professionalism in technical drawings.
Accuracy: Precise measurement and reproduction of dimensions and angles.
Neatness: Clean lines, clear lettering, absence of smudges or errors.
Line Quality: Consistent line weights for different types of lines (e.g., visible outlines thick, hidden lines dashed thin, centre lines long-short thin).
Lettering: Uniform height, style, and spacing for all text and dimensions.
Use of Instruments: Correct and skilled use of T-square, set squares, compass, protractor, scales, and drawing pencils.
Entrepreneurship in Furniture Making: Students can apply design and drawing skills directly to start their own furniture businesses (e.g., in places like Aba, Nnewi, or Lagos where furniture making thrives). They can design custom pieces for clients, prepare professional drawings for quotes, and efficiently plan material usage to minimize waste and maximize profit. This skill is critical for competing in the formal and informal furniture sectors in Nigeria. Home Improvement and Community Development: Individuals can design and construct practical wooden items for their homes (e.g., kitchen cabinets, wardrobe shelves, reading tables for children) or contribute to community projects (e.g., benches for local markets, notice boards for schools, shelves for health centres). This reduces reliance on imported furniture and fosters self-reliance using locally available materials. Creative Industries and Cultural Preservation: The principles of design can be applied to create culturally relevant wooden items, such as traditional musical instrument stands (e.g., for talking drums or xylophones), display cases for local arts and crafts, or furniture that integrates Nigerian aesthetic patterns and motifs. This integrates vocational skills with cultural heritage preservation and promotion.