VCE Product Design And Technologies cheat sheet
VCE Product Design And Technologies · Keep the key ideas within reach.
Design and Product Development Processes
Design brief components: problem statement, target user, constraints, criteria for success, budget, timeline, and required deliverables.
Research types: primary (interviews, observation, user testing) versus secondary (literature, standards, competitor analysis); primary data is collected first-hand for the specific brief.
Ideation methods include brainstorming, SCAMPER (Substitute, Combine, Adapt, Modify, Put to other use, Eliminate, Reverse), morphological analysis, and sketching.
Design process sequence: brief → research → specification → ideation → development → prototyping → testing → evaluation → production planning.
A product design specification (PDS) converts the brief into measurable requirements, each with a value and unit so compliance can be tested.
Evaluation criteria must be set before testing; formative evaluation occurs during development, summative evaluation after the product is complete.
Iteration is expected: testing results feed back into ideation or development, and each cycle should be documented in the design folio.
A design folio records the process, not just outcomes; assessors look for evidence of decision-making, justification, and revision.
Materials, Components and Properties
Mechanical properties: tensile strength, compressive strength, hardness, toughness, elasticity, plasticity, ductility, and malleability.
Physical properties: density, melting point, thermal and electrical conductivity, thermal expansion, and moisture absorption.
Ferrous metals contain iron (steel, cast iron); non-ferrous metals exclude iron (aluminium, copper, brass, titanium).
Thermoplastics soften repeatedly on heating (PE, PP, PVC, ABS, acrylic); thermosetting polymers cure once and cannot be remelted (epoxy, melamine, phenolic).
Composites combine a matrix and reinforcement (e.g., glass-fibre polyester); properties are directional and depend on fibre orientation.
Hardwood comes from broad-leaved trees (oak, ash, jarrah); softwood from conifers (pine, fir); manufactured boards include MDF, plywood, and particleboard.
Material selection uses a property profile matched to function, then filters by cost, availability, manufacturability, and environmental impact.
Smart and modern materials include shape-memory alloys, photochromic pigments, piezoelectric ceramics, and biodegradable polymers.
Manufacturing, Production Processes and Workshop Techniques
Scale decision rule: one-off (custom), batch (limited quantity with repeat setup), mass (high volume, dedicated tooling), and continuous production.
Subtractive processes remove material (sawing, milling, turning, drilling); additive processes build up material (3D printing, laminating); forming reshapes material (bending, casting, moulding).
Joining methods: permanent (welding, adhesive, rivets, nails) versus temporary (screws, bolts, knock-down fittings).
Casting processes include sand casting, die casting, and injection moulding; each requires a mould with draft angle for removal.
Jigs hold the workpiece; fixtures hold and locate the tool relative to the work; both improve repeatability and safety.
Tolerance is the permitted variation from nominal dimension; clearance fits allow movement, interference fits require force to assemble.
Quality control uses go/no-go gauges, sampling inspection, and statistical process control to detect variation before defects multiply.
JIT (just-in-time) production reduces inventory but increases dependence on reliable suppliers and accurate demand forecasting.
Product Design Factors
Purpose: the specific need or problem the product addresses; function: how the product performs that purpose technically.
Aesthetics factors include form, colour, texture, proportion, balance, and the visual language appropriate to the user and market.
Sustainability factors: material choice, energy in manufacture, product lifespan, repairability, recyclability, and end-of-life disposal.
Ethical factors include fair labour, honest marketing claims, planned obsolescence avoidance, and accessibility for diverse users.
Legal factors include consumer guarantees, product safety standards, mandatory labelling, intellectual property, and occupational health and safety law.
Cost components: materials, labour, tooling, overhead, distribution, and margin; unit cost falls with volume when tooling is amortised.
Design trade-offs occur when improving one factor degrades another; the PDS should rank factors so trade-offs are defensible.
Inclusive design considers age, ability, culture, and anthropometric data so the product fits the intended range of users.
Technologies and Tools, Including Digital Design and Production
CAD (computer-aided design) enables parametric modelling, where dimensions drive geometry so design changes update automatically.
CAM converts CAD geometry into machine instructions; G-code is the common language for CNC machines and 3D printers.
3D printing methods: fused deposition modelling (extruded filament), stereolithography (resin cured by light), and selective laser sintering (powder fused by laser).
CNC routers and laser cutters require vector files (DXF, SVG); laser kerf removes material along the cut path and must be allowed for in dimensions.
Rapid prototyping shortens iteration, but printed parts are usually anisotropic and weaker along layer boundaries than moulded parts.
Digital tools for design include CAD, rendering for visualisation, simulation (FEA for stress, thermal analysis), and spreadsheets for cost modelling.
File management matters: version control, naming conventions, and backups prevent loss and allow traceability of design decisions.
Appropriate technology decision rule: choose the tool that meets tolerance and volume requirements at lowest total cost, not the most advanced tool.
Sustainability, Environmental Impact and Circular Design
Cradle-to-grave analysis covers extraction, manufacture, distribution, use, and disposal; cradle-to-cradle designs for continuous material reuse.
Life cycle assessment (LCA) quantifies impacts such as carbon footprint, water use, and energy across a product's life stages.
Circular design strategies ranked by value retention: refuse, reduce, reuse, repair, remanufacture, recycle, recover energy.
Design for disassembly uses reversible fasteners and material labelling so components can be separated for repair or recycling.
Planned obsolescence shortens product life; counter-strategies include modular design, replaceable parts, and durable materials.
The 6Rs (reduce, reuse, recycle, repair, rethink, refuse) are applied at design stage, where most environmental impact is locked in.
Embodied energy is the energy consumed in producing a material; aluminium has high embodied energy but is highly recyclable.
Extended producer responsibility places end-of-life take-back obligations on manufacturers, influencing material and fastener choices.
Users, Markets, Needs and Product Evaluation
User-centred design collects data through interviews, surveys, observation, and usability testing, then translates it into requirements.
Anthropometric data (percentiles of body dimensions) informs sizing; the 5th to 95th percentile range typically accommodates most users.
Market research distinguishes market pull (demand-driven) from technology push (innovation-driven) product development.
Evaluation methods include user trials, performance testing against the PDS, comparison with competitor products, and cost-benefit analysis.
Usability criteria: effectiveness (task completion), efficiency (time and effort), satisfaction, and error rate.
Product evaluation should test against the criteria set in the brief, not against criteria invented after testing.
Market segmentation groups users by need, age, income, or use context so the product targets a defined group rather than everyone.
Feedback loops from users after launch inform incremental redesign and future product generations.
Safe and Responsible Work Practices and Project Management
Hierarchy of control: eliminate, substitute, engineer controls, administrative controls, then personal protective equipment as last resort.
A risk assessment records hazard, likelihood, severity, risk rating, and control measure; it is reviewed when the process changes.
Safety data sheets (SDS) give handling, storage, and first-aid information for chemicals such as adhesives, solvents, and resins.
Machine safety rules: guards in place, correct bit or blade for the material, material secured, no loose clothing, eye protection worn.
Project management tools include Gantt charts (timeline and dependencies), critical path analysis, and work breakdown structures.
Critical path is the longest sequence of dependent tasks; any delay on it delays the whole project.
Time, cost, and quality form the project management triangle; adjusting one constraint affects the other two.
Workshop documentation includes risk assessments, material safety records, maintenance logs, and incident reports.