GCSE Design & Technology: Manufacturing Processes and Scales of Production Revision Guide

Scales of production

Products can be manufactured at different scales depending on how many are needed. One-off production makes a single, often bespoke or unique item, such as a hand-made piece of furniture, and typically requires highly skilled labour and general-purpose tools, making it expensive per item. Batch production makes a set quantity of identical products before the process is changed to make a different product, which suits products needed in limited numbers, such as a run of school uniform items. Mass production makes very large quantities of identical, standardised products, often using dedicated machinery and production lines, which lowers the cost per item but requires a large upfront investment. Continuous production runs non-stop, 24 hours a day, and is used for products such as chemicals, fuel or paper that are produced in a constant, unbroken flow.

CAD and CAM

Computer Aided Design (CAD) allows designers to create, modify and test designs digitally, including 2D drawings and 3D models, before anything is physically made. Computer Aided Manufacture (CAM) uses computer-controlled machinery, such as laser cutters, CNC (Computer Numerical Control) routers and 3D printers, to manufacture parts directly from CAD data. Using CAD/CAM together allows designs to be changed quickly, manufactured with high accuracy, and reproduced consistently, which is especially valuable in batch and mass production, though the machinery itself can be expensive to buy and set up.

Quality control and quality assurance

Quality control involves checking products during and after manufacture, such as measuring dimensions or testing function, to identify faulty items before they reach the customer. Quality assurance is broader: it is a system of procedures and standards applied throughout the whole manufacturing process, from material selection to final packaging, designed to prevent faults from happening in the first place rather than just catching them afterwards. Both approaches are used together in industry to maintain consistent product standards.

Specialist tools and equipment

Jigs and templates help manufacturers work quickly, accurately and consistently, especially in batch and mass production. A jig holds a workpiece in position and guides a cutting tool, ensuring that every part is made identically. A template is used to mark out or check a shape repeatedly, saving time compared with measuring each item individually. Specialist machinery, such as CNC lathes, routers and laser cutters, can carry out complex or repetitive tasks with a level of precision that would be very difficult to achieve reliably by hand.

Common mistakes

• Confusing quality control (checking finished or in-progress products for faults) with quality assurance (the whole system of procedures designed to prevent faults occurring).
• Assuming CAD and CAM are the same thing — CAD is used to design, while CAM is used to manufacture from that design.
• Choosing the wrong scale of production for a scenario in an exam answer, for example suggesting mass production for a single bespoke item, which would be far too expensive and inflexible.