GCSE design and technology knowledge organiser for units 1, 3,4,6,7. Covers all of the relevant content for AQA GCSE design and technology exams. Condense all notes for the topics into a few pages, cutting down revision time and making it easy to visually see and interpret the information. Contains...
Component Selection Availability and costs Tolerance
Unit 7 – Making - The process for selecting - Compromise plays an important - Tolerance is the amount of erro
Principles components to complete a task role when balancing deadlines and a given task. Its often though o
is the same a for selecting costs. Materials and components that is plus or minus.
Material Selection materials. Usually both - During a making activity, it ma
are available from different sources
- Ensuring that materials are used
aesthetic and functionality and suppliers and prices can vary a achieve 100% accuracy, there
appropriately in different parts need to be considered. great deal. amount of tolerance needs to b
of a product can be a difficult Strength – Various types of strength - If items are purchased in bulk, the given product, material or com
decision. Materials need to be may need to be tested to ensure cost generally decreases
both aesthetically pleasing and materials and components perform considerably. If a large quantity of
have functional properties. their roles successfully. This is a very Measuring Units
material is required, it may be - When measuring and marking ou
Considering Functionality broad area and covers factors cheaper to purchase it in larger
- Assessing the exact including resilience to wear and tear, recommended to work in millime
formats and cut it to size.
weather proofing and chemical Allowances
functionality required for
resistance. - An allowance of materials may be required Tessellation
different materials and Movement – Elasticity, in a particular feature such as a lead on a - Using materials as economically
components in a product flexibility and other forms component, the seam allowance on an item money, reduces waster and redu
takes some investigation. of movements may need of clothing or a joint overlap. The allowance production. Sometimes the mate
Selecting the correct to be considered when makes it easier to complete the task over, after the cutting out proces
functionality ensures working out what accurately. used for other components or pa
products are fit for purpose. interactions the products
The main areas of may have to go through. Material Requirements Application of treatmen
functionality to be - One of the first consideration before - The main methods of ap
Planning
considered are: - The key to material management is marking out is to gather the material following categories:
that I required for the task. Gathering - Spraying, painting
Electrical and thermal to plan ahead. Working out the best
the correct amount of material requires - Dipping and imm
conductivity should be taken way to fit the required parts of a
some forethought. - Heat and pressur
into account for some products . product onto the material efficiently
- To work out the area of material you blasting
is not as straightforward. This
require, you first need to know the size - Electroplating and
Pattern and grain matching means you want to get the most
- When planning a garment, the materialsamount of product and reduce of the components to be made, the adhesion
number of components required and any - Buffing and polish
being used may have a pattern to it thatwaste created.
other special
Surface considerations.
treatments and finishes - Printing
needs to be considered in the planning Marking out materials
stage. Planning before ensures that the - The reasons for using surface treatments - Adhesives Reas
- Accuracy and planning are the
pattern in the material matches it for and finishes fall into two main categories. surf
most important factors when 1) Functionality – providing insulation, for m
aesthetic reasons. marking out any material. Taking
Marking and cutting out tools making it tougher, ensuring its hygienic prot
time to measure correctly and providing protection from weather - Ma
- Templates, jigs and patterns are used to ensure
followed by through checks will and water. pr
repetitive accuracy when marking our, cutting out ensure that waste I kept to a
or processing materials, These aids are produces 2) Aesthetic – colouring by printing, dyeing th
minimum and that manufactured or staining, embellishing or applying a fu
to save time and effort when manufacturing components will fit correctly first
multiple copies of a product or component . They sheen to the surface. m
time im
are often used in batch production. - Measure twice, cut once.
pr
fu
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