This mini-lesson covers Topic 4 — Final production: manufacturing techniques, scales of production (one-off, batch, mass, continuous), automation and robots, and assembly.
Work through each screen, answer the questions as you go (some are wordy, some are calculations) and collect ⭐ stars. Press Start when you are ready.
Final production turns designs into finished products. Processes fall into families:
Key idea: the best process depends on material, geometry, tolerance, finish and — crucially — the quantity to be made.
In mass production the cycle time is the time to make one part. From it we find the throughput (parts per hour).
An injection moulder has a cycle time of 30 s.
throughput = 3600 ÷ 30 = 120 parts per hour
The quantity required decides how a product is made:
Trade-off: mass and continuous production spread high setup and tooling costs over huge volumes, cutting unit cost — but they are inflexible if the design changes.
Tap a process, then tap its family.
High-volume production is increasingly automated. CNC machines and industrial robots repeat tasks with speed and consistency; computer-integrated manufacturing (CIM) links design, machining and handling into one system.
Robots excel at 3-D tasks — dull, dirty and dangerous — such as welding, spraying and pick-and-place. Assembly joins components into the finished product; design for assembly (DFA) reduces the number of parts and fasteners to save time and cost.
Trade-off: automation raises quality and output but needs high capital investment and can reduce the flexibility and workforce of a plant.
Tap a description on the left, then its scale on the right.
Injection moulding needs an expensive steel mould (tool), so its high setup cost only pays off over large volumes — but then each part is very cheap. A one-off part is better machined or 3D printed, where setup is low but each part is slower.
Key idea: the "best" process depends on quantity: tooling-heavy processes win at high volume, flexible processes win at low volume.
Forming and moulding covers a family: injection moulding (complex solid parts), blow moulding (hollow bottles), rotational moulding (large hollow items like tanks), vacuum forming (thin shells from sheet) and compression moulding (thermosets).
Each suits a different geometry and volume, so designers choose by part shape, material and quantity.
Using standard components (fasteners, bearings, connectors) and standard sizes cuts cost and simplifies assembly and repair. Interchangeable parts made to tolerance mean any component fits any product on the line.
This underpins mass production and makes spare parts and servicing far easier for the user.
Computer-integrated manufacturing (CIM) links CAD, CAM, robots, handling and inspection under one computer system. Data flows from design straight to machines, giving fast changeovers, consistent quality and real-time production control.
Trade-off: CIM raises output and consistency but demands very high capital investment and skilled maintenance.
Automation changes work: fewer manual, repetitive jobs but more skilled roles in programming, maintenance and quality. Ergonomics and safety must be designed into workcells so people and robots operate together without hazard.
Firms weigh productivity gains against retraining, job impact and the loss of flexibility that heavy automation can bring.
Process families: subtractive (cut away), additive/joining (add or fix), forming and moulding (shape material).
Scales of production: one-off, batch, mass, continuous — chosen by volume and cost.
Automation: CNC, robots and CIM raise consistency and speed for high volumes.
Assembly: joining components; design for assembly (DFA) cuts parts, time and cost.
Throughput: parts per hour = 3600 ÷ cycle time (s).
You have worked through Final Production for IB Diploma Design Technology SL. Press Finish to see your score.
You have worked through Final Production for IB Diploma Design Technology SL. 🎉
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