Production: Materials, Processes, Tools and Quality Control
Materials
Know how to classify materials as metals (ferrous and non-ferrous), polymers (thermoplastics and thermosets), ceramics, composites, and timber (hardwood and softwood). For each, know at least one property–application link: thermoplastics are recyclable and reformable; thermosets cross-link and cannot be remelted; composites combine a matrix and reinforcement to give high strength-to-weight. Understand material selection criteria: strength, durability, cost, availability, workability, appearance, and environmental impact.
Processes
Be able to describe joining (welding, adhesives, fasteners, knock-down fittings), shaping (casting, moulding, machining, laminating), and finishing (painting, anodising, oiling, powder coating). Link the process to the material: you cannot weld a thermoplastic; you weld it.
Tools and equipment
Know the difference between hand tools, power tools, and fixed machinery, and the safety controls for each. Understand jigs and fixtures: a jig guides the tool; a fixture holds the work.
Quality control
Know inspection, testing, tolerances, and go/no-go gauges, plus statistical ideas such as sampling and control charts. Understand that tolerances define acceptable variation and that interchangeability depends on them.
Traps
Students name a process without explaining why it suits the material. Students confuse a jig with a fixture. Students describe quality control as "checking at the end" only.
Rule of thumb
Always write the material–process–property chain: "Aluminium is chosen because it is light and corrosion-resistant; it is joined by riveting because welding would distort thin sheet."
Worked example
A chair frame in mild steel: select for strength and weldability; shape by cutting and bending; join by MIG welding; finish by powder coating for corrosion resistance; inspect weld penetration and check tube length against a tolerance.