The hardest part of manufacturing might be changing what you make next

The order is for a handful of parts. From the customer’s side, it sounds like a small job.

Imagine it arriving at a British subcontract manufacturer on a busy Thursday. The material is available. The machine can make the part. Nobody doubts the team’s ability. But the fixture needs changing, the drawing has a revision, the first component must be checked and another customer is expecting the work already on the machine.

The cutting may be the shortest part of the conversation.

That is the particular challenge of making many different things in relatively small quantities, often called high-mix, low-volume manufacturing. The factory must repeatedly get ready to do something different, then do it right before the order is finished.

For a business selling responsiveness, that ability to change is part of the product. It deserves more attention than it usually receives in the photograph of a gleaming new machine.

Small does not mean simple

A short run can be commercially important for reasons that have little to do with the number of pieces. It might prove a design before a customer commits to production, supply a specialist application or keep an existing product supported after demand has fallen.

The manufacturer still has to establish how the work will be done. A mistake in the first component can matter disproportionately when there are only a few to make. There is less repetition over which to recover the preparation effort.

UK injection moulder SGH describes the practical demands of its own high-mix operation in terms of tooling readiness, machine allocation and checks between production runs. That is one manufacturer’s account, rather than a measure of the whole sector, but it shows how much work sits around the actual forming of a part. SGH’s manufacturing account.

The same commercial question reaches beyond moulding: does the customer understand what the supplier must prepare, and has that preparation been allowed for?

Calling a job small should not make the work needed to begin it disappear.

The temptation to make a few more

Once a machine is ready, extending the run can seem sensible. The tooling is in place. The process is settled. Why stop just as everything is working?

Sometimes making more is sensible. Stable repeat demand, material availability and a customer’s agreed stock arrangement can justify it. A longer run may use a constrained resource more effectively.

But imagine the customer changes the design before the extra pieces are needed. Or the extended run takes the slot promised to a different buyer. The apparent saving in preparation can become stock nobody wants or a delivery problem elsewhere.

There is no universally virtuous batch size. The useful discussion is about whose uncertainty the extra production is absorbing, and whether that trade has been recognised.

A customer asking for very small deliveries may value flexibility highly. That does not automatically mean the supplier should manufacture each delivery as a separate run. Production quantities, delivery quantities and stock ownership need their own conversation.

The skill is in the transition

Visit a factory at full speed and it is easy to see the output. Watch it move from one job to the next and a different kind of expertise becomes visible.

Who notices that the next drawing and the available fixture no longer agree? Who knows which questions must be resolved before an urgent order can honestly be promised? Who can distinguish a difficult first setup from a job that will remain difficult every time it returns?

These are production skills worth designing around. Leaving them to a last-minute rescue turns an ordinary requirement of the business into a recurring emergency.

One practical thought experiment is to follow a single change of job from the last acceptable part of the previous order to the first acceptable part of the next. Where did the time go? Some of it will be essential. Some may be waiting for an answer that could have been obtained earlier.

The point is to understand the transition with the people doing it. Faster changeovers should never depend on rushed checks or unsafe access to machinery.

Automation has to survive the second job

A demonstration that repeats one task beautifully is only the beginning of the assessment for a factory making varied products.

What happens when the component changes? Who prepares the next job? How much new tooling is required? Can the team recover when the incoming material or part presentation differs from the demonstration?

Those questions do not weaken the case for automation. They make the case relevant to the factory buying it.

The UK’s Advanced Manufacturing Research Centre was exploring this problem years ago. In 2017 it described a reconfigurable research cell at Factory 2050 intended to help smaller businesses trial technologies, including small-batch manufacturing and robotic assembly, before production use. It is a historical example of the research direction, not a statement about today’s access arrangements. AMRC’s announcement.

The theme remains present in the High Value Manufacturing Catapult’s 2026 technology roadmap, which identifies adaptable automation and rapid changeovers among the capabilities needed for varied production. A roadmap sets an ambition; it does not mean every technology is ready for every workshop. HVM Catapult technology roadmap.

For a smaller manufacturer, a convincing trial might therefore include two or three representative jobs and the transitions between them. That is an editorial suggestion, not a universal test specification. The mix should reflect the work the business actually intends to win.

Responsiveness is something to sell properly

Back at the imagined Thursday enquiry, the most helpful answer may be a conversation about the customer’s real deadline, design certainty and likely follow-on demand.

Perhaps the urgent requirement is one part for a trial. Perhaps the whole batch is needed together. Perhaps a small change to the design would make future orders easier to produce. Each answer changes the promise the manufacturer can make.

Britain’s specialist manufacturers have a compelling story in this kind of work: the judgement involved in turning varied, demanding requests into something that can be made reliably.

That story is stronger when flexibility is treated as a capability to develop and price, with preparation, equipment and people behind it.

The next time a customer says it is only a small batch, the interesting question is what will have to change to make it happen.