Zusammenfassung der Ressource
Design Technology
- Woods
- Hardwood
- Beech
- Oak
- Tough, Hard, Visually
attractive, Durable, Stable
- Mahogony
- Manufactured
- MDF
- Cheap
- Available in large sheets
- Stable (doesn't
warp or twist)
- Plywood
- Softwood
- Pine
- Metals
- Ferrous
- Mild Steel
- Properties
- Tough
Ductile
Malleable
Hard
Durable
- Advantages
- Cheap
Tough
Easy to
weld
Strong
- Disadvantages
- Rusts easily
- Iron and Carbon
mixed together (alloy)
- Stainless Steel
- Carbon Steel
- Non-Ferrous
- Aluminium
- Advantages
- Can be
recycled
Easy to draw
into thin
sheets
- Disadvantages
- Expensive
Difficult to weld
- Copper
- Zinc
- Alloys
- Brass
- Advantages
- Can be polished,
Good conductor
of electricity,
Good corrosion
resistance
- Disadvantages
- Expensive
- Plastics
- Thermoplastics
- PVC
- Acrylic
- ABS
- High impact
strength, tough,
scratch resistant,
Durable,
Plasticity, Good
weather
resistance
- Thermosetting Plastics
- Polyester
Resin
- Finishing techniques
- Woods
- Varnish
- Paint
- Metals
- Paint
- Powder coating
- Galvanising
- Plastic dip coating
- Plating
- Advantages
- Improve
appearance,
Stops rusting,
More durable
- Joining
methods
- Wood Joints
- Mortise and tenon
- Butt Joint
- Dowel Joint
- Dovetail Joint
- Rebate Joint
- Joining Metal
- Welding
- Brazing
- Soldering
- Tools &
equipment
- Saws
- Drill bits
- Fittings
- Marking out
- CAD/CAM
- Computer
Aided Design
- Virtual Modelling
- Designs can be
viewed from all angles
- Can send files
electronically (email)
- Designs can be
changed easily
- Test the product before it is made
- Computer Aided
Manufacture
- Ethics
- Built-in Obsolescence
- Throw-away culture
- New improved
models come
onto the market
- Products designed
to stop working
- Cheaper to replace a
product than to repair
- Offshore Manufacturing
- Cheaper labour and energy costs