Machinery obligations: the maker's duties, the user's duties, and where they swap

Supply-side and use-side duties answer different questions

The supply side asks whether the equipment as designed and built is capable of being used safely, and expects assessment, protective measures, instructions and a declaration from whoever places it on the market. The use side asks whether this employer selected suitable equipment, installed it properly, controls the risks it creates in its actual setting, inspects it and trains people to operate it. A machine can be entirely sound on the supply side and dangerous in use because of where it was put, what it feeds and who works nearby, which is why a supplier's paperwork never closes the user's assessment.

Modification can quietly promote a user into a manufacturer

Where a business changes a machine in a way that alters what it does or introduces hazards the original assessment did not consider, many jurisdictions treat the result as new equipment placed on the market, with the modifier picking up the supply-side duties. Bolting on an automatic feeder, uprating a drive, removing a guard to accommodate a longer workpiece or repurposing a machine for a different material can all cross that line. Whether a specific change counts turns on national interpretation and on the nature of the alteration, so the sensible discipline is to assess proposed modifications against that question before the fabrication is booked rather than afterwards.

Joining machines together usually creates a new one

Linking previously independent machines with shared controls, transfer devices and a common emergency stop tends to produce an assembly that is treated as a single item of equipment in its own right, needing its own assessment, its own documentation and its own declaration covering the whole. Responsibility then depends on who did the integrating: an external integrator, the equipment supplier, or your own maintenance department. Where a plant team assembles a line from bought-in units and nobody produces documentation for the assembly, the manufacturer of that line is the factory itself, generally without anyone in the building realising it.

Used, rebuilt and imported plant carries the awkward cases

Second-hand machines are often bought at auction or from a closing plant with incomplete documentation, missing guards and no instructions. Obligations differ between simply reselling existing equipment and substantially rebuilding it, and importing machinery from outside the market normally brings supply-side responsibilities onto the importer, including checking that documentation and marking exist. A cheap machine with no file behind it can require assessment, guarding work, control system upgrades and translated instructions before it can be used, and that cost belongs in the purchase decision rather than in next year's maintenance budget.

What a user is expected to have on file, and where to verify it

For each significant machine, a user can usefully hold the supplier's declaration, the instructions in a language the operators read, a risk assessment covering its use in this location, records of pre-use checks and any scheduled examinations, training records for operators, and a change history. Design questions about safety functions, interlocking and control system integrity belong with the engineering discipline. What applies to your equipment depends on the jurisdiction, the machine and the alterations made, and this is not engineering or legal advice; national safety authorities and the relevant standards bodies publish the operative position.

Frequently asked questions

We added a robot cell to an existing press. Have we become the manufacturer?

Quite possibly, because integrating a robot with an existing machine usually creates an assembly with hazards neither original assessment examined, and the party doing the integrating typically inherits supply-side duties for the result. Even where a specialist integrator did the work, the scope of what they took responsibility for needs to be explicit in the contract. Establish before installation who will produce the assessment, the documentation and the declaration for the combined installation.

We bought a machine at auction with no paperwork. What can we realistically do?

Treat it as an engineering project rather than a purchase. That normally means commissioning an assessment of the machine as it stands, identifying what protective measures are missing against current expectations, carrying out the work, and writing your own instructions and records. Some machines are economic to bring up to standard and some are not, which is precisely why used plant should be assessed before bidding. Take specialist advice on whether your work counts as refurbishment or as placing new equipment on the market.

Does the supplier's declaration cover the way we actually use the machine?

No. It addresses the equipment as supplied for its intended use, described in the instructions. Your use introduces a specific material, a specific layout, specific adjacent activities and specific people, none of which the supplier assessed. The user-side assessment covers that ground, and it also has to consider foreseeable things operators do, such as reaching in to clear a jam. Where your use falls outside what the instructions describe, that is a signal to reassess rather than to proceed.