How are products made commercially, and how does the scale of production affect the methods used?
Commercial manufacture: the scales of production (one-off/job, batch and mass/continuous production), their effects on cost and quantity, and the use of jigs, templates, moulds, computer-aided manufacture (CAM) and automation to ensure consistency and speed in industry.
A focused answer to the SQA National 5 Design and Manufacture content on commercial manufacture, covering one-off, batch and mass production, how scale affects cost and quantity, and the use of jigs, templates, moulds, CAM and automation for consistency in industry.
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What this dot point is asking
The SQA wants you to know how products are made in industry and how the scale of production changes the methods, cost and quantity. You should be able to identify a suitable scale for a product and explain why industry uses jigs, templates, moulds and CAM for consistency and speed.
The scales of production
The right scale depends on how many are needed and how standard they are: unique items suit one-off; large standard runs suit mass production.
How scale affects cost and quantity
As scale increases from one-off to mass production:
- The quantity rises sharply.
- The cost per item falls because set-up and tooling costs are spread over many products (economies of scale) and labour is reduced by machines.
- Flexibility falls: a mass production line is expensive and slow to change to a new design, whereas one-off work can be different every time.
Tools for consistency and speed
To make identical products quickly and cheaply, industry relies on aids that remove human variation.
Computer-aided manufacture (CAM) uses computer-controlled machines (such as CNC routers and laser cutters) to make parts directly from a CAD file. CAM gives high accuracy, repeatability and speed, and links design straight to production. Automation (machines and robots replacing manual work) further increases speed and consistency and lowers labour cost.
Try this
Q1. State which scale of production makes a single, custom product. [1 mark]
- Cue. One-off (job) production.
Q2. Explain why the cost per item falls as production moves from one-off to mass production. [2 marks]
- Cue. Set-up, tooling and labour costs are spread over many identical products (economies of scale), and machines reduce labour.
Q3. Describe one benefit of using CAM in manufacture. [1 mark]
- Cue. High accuracy and repeatability, fast production, and a direct link from the CAD design to the machine.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA-style Describe4 marksDescribe the difference between one-off, batch and mass production, giving an example of a product made by each.Show worked answer →
Award up to 4 marks: up to 3 for the three types and 1 for examples. One-off (job) production makes a single, often custom, product to order, for example a tailor-made wedding dress or a bespoke piece of furniture (1 with example). Batch production makes a set number of identical products in a group (a batch), then the equipment is changed to make a different batch, for example a run of 500 loaves or a batch of school chairs (1 with example). Mass (or continuous) production makes very large numbers of identical products on a production line, often running constantly, for example drinks cans or fasteners (1 with example). The fourth mark is for clear, correct examples. Markers reward the contrast in quantity and the matching examples.
SQA-style Explain3 marksExplain why a manufacturer uses jigs and templates in batch production.Show worked answer →
Award up to 3 marks for explained points. A template or jig guides the tool or marks the same shape every time, so each part comes out identical, giving consistent quality across the batch (1). It speeds up production because the worker does not measure and mark each part from scratch, so more can be made in the same time (1). It reduces errors and waste because the guide prevents mistakes, lowering cost (1). A jig may also hold the work safely in place during machining. Markers reward consistency, speed and reduced error linked to the use of the jig or template.
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