Separate the three reasons manufacturers test prototypes
Before choosing any test, be clear about which of these three jobs you are paying for:
- Proof of function — does the mechanism do the thing it is supposed to do, repeatably?
- Proof of robustness — does it still do it under the conditions of a real plant: dust, vibration, temperature swings, operators who are not the designer?
- Proof of manufacturability — can this be built to the same behaviour in numbers, with parts and assembly anyone can source and fit?
Most prototype failures at handover come from a team that proved the first and assumed the other two. Write one sentence per category for your own machine: what has to be demonstrated, and what evidence would satisfy the person who eventually accepts the equipment. Those three sentences become your test scope.
Assess the hardware risks that actually break automation prototypes
For automation equipment, hardware testing is not one generic activity but a set of quite different exposures. Rate your prototype against the items below — high risk means it needs a planned test, low risk means a documented inspection is enough.
Motion and structure. Guideways, frames, mounts and fixturing behave differently once the machine cycles hundreds of times instead of a handful. Check for play, resonance and fastener behaviour after running, not only at assembly.
Electrical and control. Wiring routes, connectors, sensors and actuators are where prototypes differ most from production units. Verify signal integrity with the machine's own motors and drives running, and confirm the safety circuits cut power when they are supposed to.
Thermal and power. A bench prototype sits in an air-conditioned room; a factory machine stands beside heat-generating equipment on a supply that sags and spikes. Power quality and temperature rise on drivers and heaters are worth an explicit test.
Process interface. The part being handled is rarely as consistent as the samples used in the lab. Feed the machine parts at both ends of the incoming tolerance range, including deliberately imperfect ones.
Turn the risk list into test cases with a pass line
A test case is only useful if someone else could run it and reach the same verdict. For each risk above, define the setup, the input, the measured value, the pass line and the number of repetitions. A cycle-count requirement, for instance, is only meaningful if the acceptable drift after that count is also stated.
Keep one page per case: what was tested, on which unit, with what instrument, on what date, with what result. That page is what a customer, an auditor or your own production team asks for later, and it is the reference against which a delivered machine is accepted.
Decide what to run yourself and what to place with a partner
Assessing automation needs honestly means looking at capability, not only cost. Ask three questions about each test in your scope:
- Do we already own the instrument and the fixture this test needs, or would we buy them for one programme?
- Do we have staff who can run it repeatedly and record it to a standard, or only the designer who always “makes it work”?
- Is this test needed once per prototype, or on every build for years to come?
Tests that appear once, need equipment you do not own, and are needed under schedule pressure are the strongest candidates for an external partner — preferably one that also builds the equipment, so the same team sees the test results and the design. Tests that repeat on every unit, or that expose your most sensitive process knowledge, are usually worth keeping in-house, with the test tooling specified as part of the automation rather than improvised around it.
Feed the results back before the design is frozen
The point of hardware testing on a prototype is not a clean report; it is a change list that lands before tooling and long lead-time parts are committed. Every failed pass should end in one of three decisions — change the design, tighten the incoming parts, or add an inspection step in production — recorded next to the test case it came from.
This is also the moment to plan the automation itself: which motions must be repeatable to a stated tolerance, where a sensor replaces a human judgement, and which checks move from the test bench into the machine so the production unit verifies its own output.
An assessment you can run this week
Take the current prototype, and with the engineer who built it plus the person who will maintain it, write down: the failure modes you fear most; which of them have been tested rather than simply observed working once; the pass line for each; and what it would cost in time and equipment to test each one yourself. Wherever the honest answer is “not tested, and expensive to test”, that is the gap to close — and the gap you can bring to a partner that handles both the testing and the build.
Send us your drawings, that failure list and your planned volumes, and we will tell you which tests to run before the prototype is frozen, and which parts of the automation we would change based on what those tests show.
Contact Shenzhen PowerDe Automation Precision Equipment Co., Ltd. — Email: sales@powerde.net · Phone: +86 13023198376 · Contact page
