C (i) Justifies the choice of appropriate materials, components and manufacturing techniques to make the prototype.

• Identification of materials, components, and manufacturing techniques to be used to create the prototype.
• Consider 2 or more (if applicable) and compare and analyse to determine the most suitable.
• Justification of choice of each material, component and manufacturing technique based on the requirements of the prototype.

Materials are identified and selected considering the requirements of the prototype.

• Must be justified through cost, availability (supply), properties (aesthetic, mechanical and physical), manufacturability, environmental concerns, etc.
  • Valid reasons (justification) for your choice need to be presented.
  • Provide rationale for why the materials were chosen compared with other options i.e. appropriateness.
• A variety of materials should be considered.
  • These can be, natural and man-made timbers, plastics, metals, textiles, composites etc.
  • Use material selection charts.
  • Finishing of materials should be considered.

Components are identified and selected according to the requirements of the prototype.

• • Should be justified by considering cost, availability (supply), etc
    • Valid reasons (justification) for your choice need to be presented.
    • Provide rationale for why the components were chosen compared with other options i.e. appropriateness.
  • Components can include:
    • parts of the product, body, frames, etc.
    • hardware (nuts, bolts, gears, hinges, etc. 
    • Mechanical components, assemblies, or sub- assemblies, etc.
  • Joining or attaching of components

Manufacturing techniques are identified and selected according to the requirements of the prototype including joining, cutting, laser cutting, and so on.

• • Valid reasons (justification) for your choice need to be presented.
    • Provide rationale for why the manufacturing techniques were chosen compared with other options i.e. appropriateness.
    • can be justified by considering cost, availability (supply) and/or the working properties of the materials, etc
  • A variety of manufacturing should be considered.
    • These could be shaping, forming, casting, joining, CNC, 3D printing, etc

Other aspects to consider …

• This can be done in a table format. It will easier to work with.
  • Part name, component/material/manufacturing justification
• Include images where appropriate.
• This should be on approximately two A4 and approximately 400 words

 

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C (ii) Develops an accurate design proposal in sufficient detail for a third party to manufacture the prototype

Develop designs to sufficient detail for a third party (manufacturer, craftsman) to be able to interpret/understand them correctly and be able to manufacture it without help.

Appropriate technical drawings with sufficient detail for prototype manufacture

• Develop the design to take into account the choice of materials, components and manufacturing techniques.
• Use CAD, hand drawn, paper/card models and other techniques and methods to finalise the details of the design
• 3D drawings
• A set of working drawings such as, an Orthogonal (with dimension and appropriate standards/conventions), part or assembly (exploded and number the parts), sectional, isometric (3D) and exploded isometric (if needed).
• Use correct conventions, title, scale, units, name, drawing number (of a set), 3rd angle projection, dimensions, 

Bill of Materials (BoM) or Cutting (materials) list.

• • Include details such as part number, part name, sizes, materials, components, quantity, production method, finish, costings, etc.
  • In a table format.
  • This should be on approximately nine A4. Students must not include any extended writing to address this strand.

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C (iii) Produces a detailed plan for the manufacture of the prototype.

An appropriate construction plan comprises a sequential order of operations to follow to make the prototype. The construction plan must be written before the prototype is manufactured; it must not be written retrospectively.

Students must produce completed construction plan template for the process to make the prototype prior to the manufacture (it is not to be done retrospectively).

Plan should contain

• • is a sequential set of steps – step number.
  • component name.
  • description of tasks/process (no more than 10 words)
  • estimated time of completion of each stage.
  • equipment requirements.
  • risk assessment (health and safety considerations).
  • quality control (jigs, etc).
  • presented as a table or flow diagram or a Gantt chart.

Other aspects to consider …

• It should be in enough detail for a third party to be able to manufacture the prototype.
• The construction plan template must be used
• There must be no more than 10 words per cell in the construction plan template.
• This should be on approximately two A4. Students must not include any extended writing to address this strand.