Amortised, Not Absorbed: Who Actually Holds the Tooling and CAM Assets When a Chinese CNC Contract Ends
The gap between paying for tooling and owning it
When a Chinese machining supplier prices a new part, the tooling element often arrives as a modest one-off charge — sometimes labelled fixture cost, programming charge, electrode set or NRE. Just as often there is no line at all: the cost is amortised into the unit price across the first order or an agreed volume band. Both are ordinary commercial practice. Neither, on its own, establishes who owns the physical fixture, the soft jaws, the gauges, the master model, or the CAM file whose toolpaths have been tuned over four or five iterations until the surface finish finally behaved.
Under English law, title does not follow payment unless the contract says it does. A purchase order that pays "tooling: £2,400" buys a cost recovery, not a transfer of property. Chinese suppliers frequently treat customer-specific tooling as belonging to the customer in spirit while retaining physical custody — and, quite understandably, the engineering knowledge embedded in the programs. Those two positions are compatible right up to the moment they are not.
Where the ambiguity bites
The failure is rarely dramatic. It usually appears as a low-grade irritation that turns into a project delay:
- The part moves to a new supplier and the first article takes three extra weeks because the proven program stayed behind.
- A design revision requires the original fixture, which is sitting in a factory that no longer wants the work.
- A supplier is acquired, and the new management treats your tooling as part of the asset base.
- A dispute over an unpaid invoice results in a hold being placed on equipment that you believed you owned.
None of these outcomes requires bad faith. They require only a purchase order that was silent.
Enumerate the asset classes before you negotiate price
Ownership clauses fail when they are written in general terms. "All tooling shall remain the property of the Buyer" is a reasonable sentence that becomes difficult to enforce when nobody can prove what the tooling consisted of. The first practical step is a schedule in the purchase order that lists each class separately.
- Hard tooling — fixtures, base plates, dedicated clamps, soft jaws, welding or assembly jigs.
- Cutting and forming consumables that are part-specific — form tools, broaches, custom inserts, EDM electrodes.
- Inspection assets — dedicated gauges, checking fixtures, CMM programs, and the nominal data they reference.
- Digital assets — 3D models, 2D detail drawings, CAM source files, post-processors, tool libraries, probing routines and setup sheets.
Digital assets are the ones most often overlooked and most often contested. A CAM file is not a neutral artefact: it encodes feeds, speeds, stock allowances and work-holding decisions that took time to establish. Ask for it in native format, not as a PDF screenshot or a neutral G-code output that cannot be re-posted to a different machine.
Clauses that make retrieval enforceable
Four provisions do most of the work.
Title and custody. State that title to the listed assets passes to the buyer on payment of the tooling charge or, where tooling is amortised, on completion of the agreed amortisation volume. Distinguish title from custody: the supplier holds the assets as bailee, for the buyer's benefit, and may use them only for the buyer's orders.
Marking. Require permanent identification — buyer name, part number, asset number — on every physical item, and a matching asset register maintained by the supplier and reissued quarterly. An unmarked fixture in a rack is effectively unfindable.
Escrow and refresh. For digital assets, require a deposit with a third-party escrow agent or, more simply, delivery of a full copy within ten working days of each engineering change. A copy that is refreshed annually goes stale; a copy refreshed at every revision stays usable.
Exit and transfer. Specify the trigger events — termination for convenience, termination for cause, insolvency, change of control, or a defined period of inactivity on the part — and the obligations that follow: release within a stated number of days, packing to a defined standard, shipment at whose cost, and cooperation on a technical handover call.
The retrieval mechanics nobody rehearses
The clause is the easy part. Retrieval is a logistics problem, and it is worth planning before it is needed.
- Agree a destination in advance. Naming a UK contract machinist or a nominated freight forwarder at the point of order removes a negotiation from the worst possible moment.
- Price the exit. Fix a reasonable decommissioning and packing charge in the original order so it cannot be repriced under pressure.
- Photograph the assets at first article. A dated photographic register, countersigned by the supplier, ends most arguments about condition and completeness.
- Handle export classification early. Most fixtures and programs are unproblematic, but if the part sits in a controlled category, the technical data may carry its own restrictions. Establish the position while relations are cordial.
- Keep a duplicate of the digital set in the UK. The cheapest insurance against a digital asset dispute is a copy you already hold and have verified opens correctly.
A short checklist for the next purchase order
Asset schedule attached and signed? Title and custody separated in the wording? Physical marking and register agreed? Native CAM and model files specified, with a delivery trigger? Exit events and release timeline defined? Decommissioning cost fixed? A UK-side destination nominated?
Seven lines of contract text will not eliminate the risk of losing a fixture, but they convert an unwinnable argument into an administrative task. Given how often tooling is amortised rather than invoiced, that is a disproportionately good return.
