Revision Notes on most of Cp 2

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  • Graphics Chapter 2
    • Scale of Production
      • refers to the quantity of the product made
      • One off: customised designs
        • Unique Features
        • Exclusive
        • Uses; Prototype and architectural models               shop signs        vinyl stickers for companies etc
        • made to exact personal specification
        • high quality materials used
        • highly skilled crafts person
        • expensive final product
        • labour intensive and slow process
      • Batch Production: specified quantities 10s-1000s
        • Flexible tooling, machinery and work force
        • use of computer integrated manufacturing
        • Uses: commercially printed materials- magazines
        • Fast response to market trends
        • lower unit costs
        • identical batches of products produced
        • frequent changes in production - costly re tooling
        • poor production planning - large quantites stored therefore storage costs
      • Mass Production: mass market trends
        • uses: electronic products- phones etc. , and graphic products
        • Specialised work force
        • low unit costs
        • Low labour costs
        • automated and efficient manufacturing processes
        • low skilled workforce = low wages
        • High initial set up costs - expensive machinery
        • inflexible- cannot respond quickly to market trends
    • Modelling and Prototyping
      • Block Modelling
        • helps determine shape, dimensions and surface details. Also help with ergonomic factors.
        • MDF
          • no grain so easy to cut
          • excellent surface finsih
          • can be spray painted to create a professional feel
          • use for moulds for vaccuum forming
        • Styrofoam
          • easily cut and shaped
          • produced relatively quickly
        • PROCESS
        • 1. Mark plan and side profiles
        • 2, Cut MDF using bandsaw
        • 3. Shape using Surfoams,rasps and files
        • 4.sanding
      • TOOLS
        • BANDSAW: Cutting sheet materials
        • VIBROSAW: Cutting thin sheet material
        • HOT WIRE CUTTER: hot metal wire that cuts through styrofoam and expanded polystyrene
        • COPING SAW: cutting curves in sheet material
        • PILLAR DRILL: electric drill to drill holes in most materials
        • SURFORM: roughly shaping soft material
        • RASP: shaping soft materials
        • FILE: creating a smooth finish on acrylics and MDF
        • GLASSPAPER smooth surface finish on WOODS and STYROFOAM
        • WET AND DRY PAPER: Making a smooth finish on acrylic and MDF
        • SANDING SEALER: seeling the pourous surface of MDF before painting
        • SPRAY PAINT: profesional looking finish to MDF
      • Rapid Prototyping
        • Fast entry to market
        • reduced development time
        • produces complex accurate shapes directly from CAD
        • Accurate testing of Models
        • two types - 3D printing and Stereolithography
    • Health and Safety
      • Using Computers
        • Repetitive Strain Injury (RSI) affects muscles and tendons due to poor posture and/or repetitve motions
        • Hazard: Using a computer
          • Risk: Eye Strain
            • Control measures: Adjust screen glare using brightness/contrast controls.
            • Reduce reflections
            • take regular breaks to rest eyes
          • Risk: RSI
            • tilt keyboard for comfortable typing position
            • use ergonomic keyboard with wrist support
            • take regular breaks to rest hands
      • Workshop Practices
        • Hazard:: Using a Pillar Drill
          • Risk: Damage to eyes from flying debris
            • Wear Goggles
            • Person at risk: user/peopele in immediate area
            • Control Measures
            • supervision by teacher
            • other students wait behind yellow taped line /barriers
          • Risk: Cuts from metal shavings
            • Person at risk: User
            • Control Measures
            • Work clamped securely in vice
            • Wear Gloves
            • place shavings in disposal container

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