Technology Unit 1

Symbols
1. Start/Stop
2. Outputs
3. Decision/Compare
4. Wait/Increment/Decrement/Expression
Manufacture
1. WOOD
  1. Softwoods: Come from coniferous trees, which can take 30-50 years to reach maturity and are also cheaper than hardwoods.
    1. Pine, Fir + Cedar
  2. Hardwoods: Come from deciduous trees, they can take up to 100 years to reach maturity and grow in warmer climates.
    1. Oak, Mahogany + Birch
  3. Man-Made Boards: These are made by cutting up solid wood and putting back in a variety of ways, this provides stronger, more stable and cheaper wood.
    1. Plywood, Chipboard + Medium Density Fibreboard
  4. Joining Wood.
    1. Butt Joint: Simplest of all joints, it is rather weak but can be strengthened by glue.
    2. Rebate Joint: This corner joint is stronger and more rigid.
    3. Dowel Joint: This is a butt joint which is strengthened by dowels.
    4. Halved Joint: One piece of wood crosses the other and are glued together.
    5. Mitre Joint: Two pieces of wood joined at a 45° angle.
  5. Finishing Wood.
    1. Staining - this changes the woods colour but still allows for the grain to be visible.
    2. Varnishing - this covers the surface of the wood with a protective coating.
    3. Painting - this changes the colour and hides the grain pattern
2. PLASTICS
  1. Thermoplastics: These soften when heated and keep their shape when cooled.
    1. Polystyrene - cheap and light weight
    2. PVC - strong and flexible
    3. Acrylic - hard and rigid
  2. Thermosetting: These are stiffer and stronger and will not soften.
    1. Urea Formaldehyde - hard and a good insulator
    2. Melamine Formaldehyde - hard and heat resistant
3. METALS
  1. Ferrous Metals contain iron.
    1. Cast Iron, Stainless Steel
  2. Non-Ferrous do not contain iron.
    1. Copper, Brass

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Technology Unit 1

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	Created by toffe367 about 9 years ago