Customization is the reason non-standard automation exists and also the reason so many of these projects finish late. A standard machine is bought against a specification; a custom machine is designed against requirements that were not fully known when the design started, and every later change is paid for twice — once in engineering and once in the schedule. Buyers working with non-standard automation equipment should treat customization as something to be constrained, not something to be accommodated at every meeting.
Customization starts where the standard machine stops working
The decision to go custom is justified by something a standard design cannot do: part geometry that will not fixture conventionally, a tolerance or finish requirement outside the standard's range, a footprint the building imposes, a feeding or unloading sequence tied to an upstream process, or a changeover requirement across product families that no catalogue machine handles. Write that reason down at the start, because it becomes the test for every later request. Anything that does not serve it is a preference, and preferences belong in a change log with a price attached.
Three places customization changes the design most
The part-handling interface. Fixtures, grippers, feeds and orientation features are where a custom machine earns its cost or loses it, and they are also the part most likely to be changed late, because the part drawing itself changes. Design the interface as a replaceable module with a documented mounting pattern, so the next product is a fixture change rather than a rebuild.
The control layer. Every custom feature becomes a function that someone has to programme, prove and maintain. The question to hold is how much of the customisation is delivered as configurable parameters an operator can change — recipes, speeds, stroke limits, enable conditions — and how much is hard-wired logic that requires the integrator to return. Two machines with identical hardware can differ enormously in flexibility on that line alone.
The service envelope. A bespoke frame, a non-standard drive, or a sensor chosen for one awkward station means spares that nobody stocks. Each custom choice should be tested against one question: can the plant maintain this in two years without the original engineer.
Use a freeze point, and make it mean something
Set a design freeze — the point after which changes are change orders with cost and schedule impact stated — and hold it. Before that point, spend the effort on the parts list rather than on the machine: the full range of parts the machine must handle, their dimensional variation, what the next product will look like, and the cycle time in and out of the cell. After it, accept that a better idea is a change order, because a project that stays open to improvement never reaches acceptance.
Suppliers offering integrated engineering and development work — the kind of service PowerDe lists alongside its automation range, with capability described at Engineering Services — can carry the design effort, which usually shortens the path to a working machine. The commercial point does not change: the deliverable before build must be a specification the buyer signs, not an understanding.
Specify acceptance against the custom requirement, not against the machine
A custom machine has no industry-standard acceptance test, so write one that proves the reason it was built. If it exists to handle a difficult geometry, the test is that geometry, in production, at rate, with your operators. If it exists for fast changeover, the test is a timed changeover between two products you chose. Include the parts the machine rejects and the stoppages it causes, because a custom build usually passes its first test and fails its maintenance.
Close the file with the documentation that makes the customisation maintainable: as-built drawings, the programme with its comments, the parameter list, the fixture drawings, and the spares list with part numbers. Custom equipment without as-built documentation is equipment nobody will dare to change — which is the moment the next product arrives and the machine stops being an asset.
