DT revision guide

Only what I've been doing in class

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  • Created by: Rachel
  • Created on: 26-04-11 17:28
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Plastics
Thermoset
Once heated and formed, doesn't return to original state form again. E.g. Kettles, saucepan handles
Adhesives e.g. Araldite, an epoxy resin
Polyurethane, basis of many paints and varnishes
Melamine Formaldehyde, used in kitchen surfaces as it is hygienic (won't melt with saucepans
placed on it, etc.)
Polyester Resin can be mixed with fibre glass to make things like car parts.
Thermoplastic
Has a memory and hardens once cooled but will melt subject to heat, and can be remoulded. E.g. gum
shields, plastic cups, zips, toys
Polythene, used for bowls, bottles. Excellent at being moulded into shape.
Polyvinyl chloride. PVC raincoats, coating on wires and pipes
Acrylic, known as Perspex. Used in schools and comes in lots of colours. Can be
Translucent/Opaque
Other:
Used a vinyl cutter
Plastics main source is crude oil
Plastic Memory. Each time a plastic is reheated it will attempt to return to its original flat shape
unless it has been over heated or damaged. This is called a plastic memory.
Cadcam:
Cad = computer aided design
Cam=computer
Isometric Drawings
CAFE QUE
(Cost, Aesthetics, Function, Ergonomics, Quality, User, Environment)
Woods
Softwoods
Coniferous trees (or evergreens) - cones or needles on trees
They grow quickly.
E.g. PINE, SPRUCE, FIR
Grow on the northern and southern parts of the globe.
They are harvested after 30 years. Because of this, they are quite cheap.
Hardwoods
Deciduous trees (trees that lose their leaves)
They grow quite slowly.
E.g. OAK, MAHOGANY
Grow in temperate climates.
Harvested much later.
More Expensive
Manufactured
E.g. CHIPBOARD (chips), PLYWOOD (layers), BLOCKWOOD (blocks in rows), HARDBOARD (dust), MDF
(dust)

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Advantages: cheaper, more flexible (can be wider), stable, less easy to stain
Veneered to look like real wood.…read more

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