Tech revision YEAR 9 -2

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Tech revision YEAR 9 -2
2015-11-15 07:14:38

Technology y9
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  1. When drilling small holes, what can be used to make the material secure?
    Vice or clamp
  2. What is the function of the carpenters brace?
    Carpenters brace makes large holes in wood
  3. What are two types of drill bits?
    • Fortsner drill bit
    • Countersink drill bit
  4. 3 safety precautions when using a drilling machine?
    • Wear goggles
    • Have scrap wood underneath your work
    • Secure your work in a vice
  5. How is the material held when drilling holes over 10mm?
    It should be held in a G clamp to fasten the work securley to drilling table
  6. What precaution must be taken when drilling acrylic?
    Put scrap wood under it
  7. Name two materials that can be filed.
    Acrylic and wood
  8. Name and explain the two basic methods of filing.
    Cross-filing; used to remove waste material and file down to a line. The file is pushed across the work.
  9. Draw-filing; carried out using a smooth file to give a shiny finish. The file is pushed sideways up and down the edge
  10. After filing how can the edge of acrylic be smoothed?
  11. What is a linisher and what is it's function?
    It smooths the faces of materials like acrylic and wood.
  12. 3 safety precautions when using a linishing machine?
    • Goggles
    • No small pieces can be smoothed
    • Must be sanded when the work is on the table
  13. Name the best glue for joining two pieces of acrylic together?
    Tensol Cement
  14. Name two safety precautions when gluing plastics?
    • Replace lid immediatley after use
    • Work in a well ventilated area
  15. Why is the selection of the corrct type of glue for plastics very important?
    If you choose the wrong glue, it can melt the plastic
  16. Name another glue that could be used on acrylics?
    Araldite Rapid
  17. Why are there different marking tools used for various materials?
    They require different tools because it is the clearest to see on the material
  18. What tool is best for marking out on plastic?
    Spirit-based marker pen
  19. Name the tool used to assist in drawing lines at the right angles on plastic and wood?
    A try square
  20. List 3 safety precautions when using a strip heater?
    • Wear gloves
    • Have your hair tied back
    • Tie tucked in
  21. 5 steps on bending?
    1. Mark the position of the bend, using a spirit pen or a chinagraph pencil

    2. Switch strip heaater on. This is simply an electric fire element mounted below a narrow opening.

    3. Place the bend line over the heat. Turn the work over every few seconds to ensure even heating.

    4. The work soon gets soft along the bend line. Once it is soft, place it on some sort of former and hold it there until it cools

    5. Once cooled, acrylic will stay bent. Remove line by rubbing it with metal polish.
  22. 3 types of files?
    • Square
    • Round
    • Half round
  23. Safety rules of files?
    Always use with correctly fitting handle
  24. After filing, name the next two processes?
    Buffing and polishing
  25. Which type of plastic would be suitable to manufacture washing up liquid bottles from?
    Low density polystyrene
  26. Why is acrylic used to make external signs?
    Colourful and cheap
  27. A manufacturer intends to make and sell electrical light fittings, such as plugs and light switches. Which tough plastic with a good looking surface would you reccomend?
    Urea formaldehyde
  28. Name one property of acrylic that may prove to be a disadvantage?
    Scratches easily and breaks easily because it's thin
  29. Name a suitable plastic used in the boat industry to make small rowing boats?
    Polyester resin
  30. Two types of plastic?
    • Thermosetting
    • Thermo
  31. What is the main difference between THERMOSETTING and THERMO?
    Thermosetting; resistant to heat. Once formed, can't be re-shaped.

    Thermo; they can be reshaped multiple times when there is heat.
  32. What is the 5 thermosetting plastics?
    • Urea Formaldehyde
    • Polyester Resin
    • Melamine Formaldehyde
    • Epoxy Resin
    • Phenol formaldehyde
  33. What is the 7 thermoplastics?
    • Acrylic
    • Rigid Polystyrene
    • Expanded Polystyrene
    • Low Density Polythene
    • High Density Polythene
    • Rigid PVC
    • Flexible PVC