Too many buyers order a customized automated assembly machine on promises alone, then discover defects after delivery. Our Wenzhou team has seen the damage — and how to prevent it.
Confirm validation before ordering by requiring a written validation path: a User Requirement Specification, Design Qualification review, an approved Factory Acceptance Testing protocol with pass/fail criteria, sample parts produced by the machine that match your product, and complete documentation — all tied to payment milestones in the contract.
That answer covers the framework. Now let me break it down. Below, I will walk through the exact tests, documents, and checks I recommend to every buyer who contacts our factory. Each step is something you can request in writing before you sign a purchase order.
Last year a procurement manager from Mexico asked us to run his own copper lugs through our terminal assembly machine before he paid the balance. Smart move.
Request a full Factory Acceptance Testing run using your actual components: a continuous production trial of at least several hours, cycle-time verification, repeatability checks, defect-rate counts, safety function tests, alarm simulations, and sample parts you can measure against your own product drawings.
The single most important request is simple. Ask the factory to produce real parts with the finished machine, then check whether those parts match the product you actually need to make. This is the test I insist on for every buyer, because it cuts through every sales claim. A machine can look impressive on video. Vibratory bowl feeders can spin and sort beautifully. But if the crimped lug or assembled fitting coming off the line does not match your drawing, nothing else matters.
Here is the test package I recommend you name explicitly in your purchase agreement:
| Test | What It Proves | What You Should Receive |
|---|---|---|
| Continuous production trial | Stability over hours, not minutes | Timed output log and video |
| Sample part production | The machine makes YOUR product | Physical samples shipped to you |
| Cycle-time verification | Sustained speed matches the quote | Raw timing data per station |
| Repeatability check | Precision holds across hundreds of cycles | Dimensional measurement report |
| Safety and alarm tests | Guards, e-stops, and interlocks work | Signed safety checklist |
| System integration testing | PLC, HMI, sensors, and feeders work together | Fault-response records |
Good suppliers also test worst-case conditions. Ask for deliberate jam recovery, sensor failure simulation, power-loss restart, and trials with your most variable components. We map these scenarios in a risk assessment matrix 1 before the build, so nothing surprising happens at your site. A newer trend worth adopting: high-speed video analysis during Factory Acceptance Testing, which reveals micro-stoppages and harmonic vibrations invisible to the naked eye but damaging to long-term component life.
There is a trade-off we weigh on every project: filming and documenting a full FAT adds days to our schedule, but it removes every argument later.
Verify FAT results by approving the test protocol before the build finishes, attending in person or by live video, checking raw data against pass/fail criteria, tracing every requirement through a traceability matrix, and requiring signed deviation reports plus machine-produced samples shipped to you.
FAT is the supplier-side test used to determine whether the equipment satisfies the agreed acceptance criteria before shipment. That definition matters. If no acceptance criteria were agreed in advance, the FAT report is just the supplier grading its own homework. So the verification work starts before the test, not after it.
Ask for the FAT protocol early, while the machine is still being built. Review it. Confirm every requirement from your User Requirement Specification 2 appears as a testable line item with a pass/fail threshold. Then sign it. Once you approve the protocol, the supplier cannot quietly skip the hard tests.
Many of our overseas buyers in the US, Canada, and Slovakia cannot fly to Wenzhou for every project. So we run live-video FATs and share raw logs. Wherever your supplier is, insist on the same. A summary page saying "PASS" tells you little. Raw cycle counts, timestamps, and measurement sheets tell you everything.
| Verification Method | What It Catches |
|---|---|
| Pre-approved protocol with signatures | Skipped or watered-down tests |
| Live witness (on-site or video) | Staged or edited demonstrations |
| Traceability matrix (URS → test) | Requirements never actually tested |
| Raw data review | Cherry-picked results |
| Signed deviation reports | Unresolved failures hidden before shipping |
| Samples shipped for your inspection | Output that looks fine on camera only |
One objection I hear from other suppliers: full validation before ordering is impossible, because final validation needs the real site, utilities, and product. That is partly fair. The honest compromise is a staged approach — define testable assumptions and worst-case scenarios up front, prove them at FAT, then confirm the rest during Site Acceptance Testing at your facility. What is never acceptable is "we validate during commissioning" with nothing in writing beforehand.
A hard lesson from an early export to Slovakia taught me this: a machine without complete drawings and software records becomes an orphan the day something breaks.
Review the User Requirement Specification, Design Qualification records, the process validation protocol, FAT and SAT reports, electrical schematics, software version records, calibration and maintenance plans, spare parts lists, training materials, safety compliance certificates, and a risk assessment matrix covering failure modes.
Documentation is not paperwork for its own sake. Modern custom machines integrate PLCs, HMIs, machine vision, and safety interlocks, and some connect to MES or SCADA systems. Without records, you cannot service, upgrade, or troubleshoot any of that. When we deliver a customized automated assembly machine, the document package travels with it — and I advise every buyer to audit that package before ordering, not at delivery.
The classic validation path runs URS → Design Qualification → FAT → shipment → SAT → Installation Qualification → Operational Qualification → Performance Qualification. Each stage should leave a paper trail. The V-Model framework makes this easy to audit: every design requirement on the left side must map to a specific test protocol on the right side.
| Document | What It Proves | When You Should Receive It |
|---|---|---|
| User Requirement Specification | Your needs are defined and agreed | Before design starts |
| Design Qualification report | The proposed design can meet the URS | Before build approval |
| Process validation protocol | Testing is planned, not improvised | Before or with the PO |
| FAT / SAT reports | Performance proven at factory and site | At each acceptance gate |
| IQ / OQ / PQ protocols | Installation, operation, and real-condition performance verified | Per project plan |
| Electrical schematics and mechanical drawings | Long-term serviceability | With the machine |
| Software version records and backups | You can restore or audit the control system | With the machine |
| Calibration, maintenance plans, spare parts list | Ongoing production stability | Before final acceptance |
If you supply medical device or pharma production, expect to require GAMP 5 standards alignment and full Installation Qualification, Operational Qualification, and Performance Qualification evidence with traceability. IQ proves the installation matches approved specifications, OQ verifies operation across defined parameters, and PQ confirms performance under real production conditions. General industrial buyers can run a lighter package — but the schematics, software records, and maintenance documents are non-negotiable in my view. Buyers now also increasingly ask about software security; a basic audit confirming the PLC and HMI are protected against unauthorized access is a reasonable pre-order request.
During a recent trial for a pneumatic fittings machine, our claimed cycle time 4 held for ten minutes — then a feeder jam exposed the real number. We fixed it before shipment.
Check cycle time and precision by defining pass/fail numbers in the contract, running an extended trial with your real components, timing sustained output rather than short bursts, measuring machine-produced samples against your drawings, and confirming repeatability across worst-case product variation.
Machine cycle time is the most commonly exaggerated number in automation sales. A burst speed measured over thirty cycles is not a production speed. Precision claims have the same problem: one perfect part proves nothing about part five thousand. Here is the process I walk buyers through before they commit to a customized automated assembly machine from anyone, including us.
If your line has a takt time target, verify the machine's sustained rate leaves headroom for changeovers and maintenance. A machine quoted exactly at your takt has zero margin, and margin is what keeps a factory calm.
Validation is evidence, not a promise. Demand the documents, witness the tests, and measure the samples before you pay. If you want a validation-ready machine, our team is ready.
1. OSHA guidance on identifying hazards and assessing risks in industrial and manufacturing environments. ↩︎
2. Provides a standard definition of URS within the systems engineering and validation lifecycle. ↩︎
3. Authoritative Wikipedia entry providing a detailed definition and requirements for Installation Qualification (IQ). ↩︎
4. Standard industrial definition of the time required to complete a single process or part. ↩︎
