Low-volume, high-mix: a plant organised around changeover

Setup time is what you are really selling

The plant's commitment is to be ready quickly, over and over. That means external setup wherever possible — tooling pre-kitted, programmes proven offline, fixtures on standard bases — and equipment chosen for quick-change capability rather than raw cutting power. Machines with tool magazines, pallet changers, modular workholding and probing earn their premium here in a way they never would on a dedicated line. Layout follows the same logic: tooling stores beside the machines, gauges at the point of use, and a documented method for anything run more than once, because the second run should never cost what the first did.

Where this demand shape comes from

The mix arrives from spare parts obligations, capital equipment builds, regulated niches, and customers who need variety more than they need price. Order sizes are small, repeat intervals irregular, and the same part may return after a long gap carrying the same drawing and none of the original setup knowledge. That pattern rewards shops keeping proven programmes, setup sheets and fixture records searchable by part number, since the difference between a job that simply runs and one that has to be re-engineered from scratch is entirely a records question. Losing a fixture between orders can cost considerably more than the job that originally paid for it.

Stock spread thinly across a long tail

Material and components sit in many small quantities, much of it slow-moving and some effectively dead. Kitting becomes essential — releasing a job with a missing item wastes the setup as thoroughly as a machine breakdown does — and a shortage discovered at the spindle is the most expensive kind. Obsolescence accumulates quietly: a customer changes a design, a programme ends, and the parts remain on the shelf because no periodic review flags them. Physical control matters as much as system control, since small parts in wide variety are exactly what goes missing.

Buying quantities nobody wants to sell

Price breaks written for volume buyers stay out of reach, minimum order quantities exceed what the job needs, and distributors rather than mills become the practical source. That premium is structural and belongs in the quotation rather than being treated as a purchasing failure. Consolidating spend across many part numbers with fewer suppliers restores some leverage, as does agreeing call-off arrangements where a supplier holds an annual quantity and releases against demand. Supplier fatigue is a real hazard: a vendor asked repeatedly for tiny amounts on urgent dates will eventually deprioritise the account.

The data burden, and where the model breaks

Every part number needs a routing, a bill of materials, a setup record, an inspection requirement and a price, and maintaining thousands of these is itself a workload. Scheduling has to sequence around shared tooling and setup similarity rather than simply by due date, since grouping jobs by fixture or material can recover a full shift in a week. Quality paperwork multiplies as well — a first-article report per part, per revision. Growth stalls when engineering and planning cannot keep pace with the quotation flow, and the classic failure is a shop charging for machine time while giving setup away.

Frequently asked questions

How should we price setup on short runs?

Charge it explicitly rather than amortising it invisibly into a unit price, and quote a separate figure for a repeat order where the setup already exists. Hiding setup in the piece price makes small quantities look expensive and large ones look cheap, which invites customers to argue about the wrong number. It also removes the incentive to reduce changeover: once the charge is visible, a genuine improvement becomes a competitive argument you can actually make.

Is it worth grouping similar jobs together in the schedule?

Almost always, provided delivery dates allow it. Sequencing by shared fixture, material or tooling family converts several full setups into one setup plus minor adjustments, and the saving drops straight to the result. The discipline required is a planner willing to hold a job briefly to catch the family run, and a sales team that understands why. The limit is customer promise dates: grouping that pushes a job past its commitment simply relocates the cost.

Do we need a full manufacturing execution system for a shop like ours?

The transaction volume is low but the variety is high, which is a different problem from the one those systems usually solve. What matters most is reliable routing and setup documentation, accurate job costing, tooling and programme retrieval by part number, and scheduling that respects shared constraints. Some shops get that from a well-configured production module, others need dedicated shop-floor software. Buying capability designed for repetitive high-output lines rarely fits the way work actually arrives here.