Design & Manufacture

Some notes from Chapter 4 of the AQA text book

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Design & Manufacture
Chapter 4
Form
Cost of Production Initial cost
Disposable
(polystyrene)
Aesthetics Consumer
Cost of Material
Preferences
Life expectancy
Why materials
are chosen
High Quality, Long
Prevent Scolding
term use
Function
Form
Not effected by
contents
Patterns on
Not contaminate Hold Liquid the outside See content of cup
contents
Example: Tooth Brush
Tooth Brush
Function Oral cleaning facility (Cleaning Teeth)
Water-filled
Environment Chemicals used for cleaning teeth
Force used to clean teeth.
6-8 weeks (based on dental Advice )
Life Expectancy
Cost Around £2 per brush
PMMA (Acrylic)
Moulded to form by heating
(Thermoplastic)
Injection Moulded (3-D complex shape)
Can be coloured
Injection Moulding = Cost effective
Material
TPE used for over moulding to give grip on
handle (can be coloured)
Dual Moulding
Nylon Bristles (moulded into acrylic to
secure them)
Nylon = Tough, Stiff, High Strength.
Craig Nunn Maiden Erlegh School, Reading [email protected]

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Design & Manufacture
Chapter 4
Example: Domestic 13-amp Plug
Domestic 13-amp Plug
Provide a safe connection between a 240volt
Function
appliance and the electrical supply in a home.
Upper and lower `wings' to make it easier
to insert and pull out of plug socket without
fingers touching the pins.
Features Brass pins to allow electricity to pass
through.
2-part case stopping contact between user
and the electricity. (Insulator)
Environment
Designed to last a long time with appropriate use.
Life Expectancy
Cost
Coloured white.…read more

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