The role of computer-aided design and manufacture, CNC machining and additive manufacturing, and the digital systems that support modern production such as robotics, flexible manufacturing systems and the management of a global supply chain.

What this dot point is asking

AQA wants you to explain how CAD and CAM work together, describe CNC machining and additive manufacturing, and explain the digital systems (robotics, flexible manufacturing, automated handling and global supply-chain management) that support modern production, with their advantages and drawbacks.

CAD and CAM

CAD allows quick modification, simulation and stress testing, and shares accurate files across a design team. The deeper advantage AQA looks for is that CAD turns the design into data, and data can be tested, copied and transmitted at almost no cost. A designer can run finite element analysis to predict where a part will fail under load, simulate the motion of a mechanism, render a photoreal image for a client, and produce a cutting list, all from the same model before anything physical exists. Because the file is shared, a team spread across several sites works on one master model rather than reconciling separate drawings, which links this topic to global supply chains. CAM closes the loop: it takes the geometry and generates the tool paths and machine instructions (often G-code) that drive the machine, so there is no manual re-drawing and no transcription error between the design and the made part.

CNC and additive manufacturing

It is worth being clear on why each method suits different work. CNC is subtractive and accurate but wastes the removed material and is limited by what a tool can physically reach, so it suits accurate metal parts in moderate volume. Additive manufacturing builds only where material is needed, so it wastes little, can create internal channels and lattices impossible to machine, and needs no dedicated tooling, which is why it dominates rapid prototyping and bespoke one-offs such as custom medical parts, though it is slower per part and the surface finish and strength can be inferior. Choosing between them is the same trade-off logic as choosing any process: accuracy, waste, geometry, volume and cost.

Digital systems in production

Modern factories link these tools with robotics (for welding, assembly and handling), flexible manufacturing systems (FMS) that can switch products quickly, automated guided vehicles and stock control. A flexible manufacturing system matters because it combines the efficiency of automation with the adaptability of changing product simply by loading a new program, so a single line can make several variants economically in smaller batches, which is increasingly how modern products are made. Digital data also lets a company run a global supply chain, coordinating design in one country, manufacture in another and distribution worldwide, with shared CAD files, automated stock control and just-in-time delivery keeping the chain synchronised. The trade-offs run through all of this: automation gives accuracy, repeatability and round-the-clock running, but demands high capital investment, risks deskilling the workforce, and makes production dependent on reliable software, data and power, so the right level of automation depends on the production volume and the value of human skill in the task.