Key term
CCEA A-Level Technology and Design 8900
Material Selection and Wood
Metals
Plastics
Composite and Emerging Materials
Processing Materials
Product Analysis and Design Communication
Design for Manufacture, Quality and Safety
Electronic Control SystemsOption A
Topic overviewControl systems, feedback and electronics safetyResistors, Ohm's law and power ratingsCapacitors and RC timingPotential dividers, sensors and comparatorsSwitches, pull-up and pull-down resistorsOutput devices and LEDsTransistors, Darlington pairs and thyristorsLogic gates, truth tables and flip-flops555 monostable and astable timers
Microelectronic Control SystemsOption A
Topic overviewMicrocontroller systems, ADCs and DACsStrain gauges and bridge circuitsOptical switches, encoded discs and Schmitt triggersOp-amp amplifiers and gainZener diodes and voltage regulatorsKarnaugh maps and binary countersSeven-segment, LCD and dot matrix displaysPIC flowcharts and programmingDC motors, stepper motors and driver circuits
Mechanical and Pneumatic ComponentsOption B
Topic overviewOpen and closed loop mechanical and pneumatic controlSafe working with compressed air and mechanismsLevers, linkages and momentsGear types and gear trainsPulleys, belts, chains and shaft fixingsCams, cranks and converting motionCompressed air supply and pneumatic valvesCylinders, shuttle valves, restrictors and reservoirsPneumatic circuits for logic, timing and speed control
Mechanical and Pneumatic SystemsOption B
Topic overviewHydraulics, system limitations and plant safetyTorque, work, power and air consumptionVacuum handling, proximity sensors and 5/3 valvesSequential and cascade pneumatic circuitsCam profiles and follower displacement diagramsGear geometry, pulley blocks and ratchetsToggles, treadles, shafts and couplingsFriction, brakes and clutchesBearings, lubrication and seals
Designing and Manufacturing ProductsOption C
Topic overviewResearch, questionnaires and specificationsIdea generation, critiques and computer simulationManufacturing planning and product evaluationCFRP, GRP, Kevlar and tungsten carbideSmart materials, nanotechnology and biophotovoltaicsIsometric, perspective and assembly drawingLaminating, steam bending, cutting and printing processesRisk assessment and product safety lawScales of production, JIT and cell productionQuality assurance, ISO 9001 and continuous improvementDesign influences and intellectual property rights
Product Design in Industry and SocietyOption C
Topic overviewLife-cycle environmental impact and climate changeThe 6Rs, waste and environmental legislationSustainable metals, plastics and degradable polymersProduct life cycles, consumer types and relaunchesCAD, CAM, 3D scanning and quick-change mouldingMarket pull, technology push and market strategyPrice, place and promotionJigs, fixtures and ICT in quality controlDesign for maintenance, inclusion and scale productionRendering, typography and presentationDyson, Baylis, Memphis and Apple
Product Development
Product and System Design and Manufacture
Product Development
Modelling, testing and evaluating a redesign
- 3 things to know
- AS 2
Overview
Three-dimensional models and materials, 3D printing, models against prototypes, recording changes, testing against the original, objective evaluation and a worked mass reduction.
What you need to know
Answer each one before you reveal it.
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Key term
What materials are commonly used for quick design models?
Key term
When is 3D printing useful for a redesign model?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Why does a redesign need a three-dimensional model?
Model answer
A three-dimensional model shows the redesign's size, form and handling in a way drawings cannot. Problems can be spotted before production.
- 2
What materials are commonly used for quick design models?
Model answer
Card, foam board, modelling foam and wood are quick and cheap to shape. The materials suit testing form and scale.
- 3
When is 3D printing useful for a redesign model?
Model answer
3D printing produces accurate parts directly from CAD, including complex shapes. The method suits testing fit and function of small components.
- 4
What is the difference between a model and a prototype?
Model answer
A model mainly shows appearance and form. A prototype works like the final product so its function can be tested.
- 5
Why should changes made during modelling be recorded?
Model answer
A model often reveals problems that lead to design changes. Records explain why the final design differs from the plan.
- 6
What making skills might a redesign model require?
Model answer
A model may need accurate marking out, cutting, shaping, joining and finishing. Some parts may use CAM processes such as laser cutting.
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