OCR Engineering Manufacture Level 1/Level 2 (J823) Past Papers

Process planning for one-off manufacture requires selecting the correct operation sequence based on the component geometry and material. For a turned component: start with facing (creating a flat end), then rough turning (removing bulk material), finish turning (achieving final diameter), drilling (if required), then parting off. Operations must be sequenced to allow workholding — operations that require a chuck jaw near the workpiece should come before parting off. Document each operation with: operation number, description, machine/tool used, quality check required, and time estimate. Quality control in manufacture requires precise measurement. Vernier callipers read to 0.02mm accuracy: read the main scale (mm), then find the vernier scale division that aligns exactly with a main scale division and multiply that number by 0.02. Micrometers read to 0.01mm: read the sleeve scale (0.5mm per graduation), then the thimble scale (0.01mm per graduation), add them together. For hole gauges, know the difference between go and no-go gauges: the 'go' gauge must pass through (part is not undersize); the 'no-go' gauge must not pass through (part is not oversize). For manufacturing in quantity, match the production method to the scenario: jobbing production for one-off bespoke items (expensive per unit, flexible); batch production for small to medium quantities of the same item (moderate cost, some set-up time); mass/flow production for high-volume identical items (low unit cost, high capital investment). Just-in-time (JIT) inventory reduces storage costs but requires reliable suppliers; just-in-case holds buffer stock and is more resilient to supply disruptions.