No, the practice of putting every single machine through overnight vibration testing was discontinued. Reviewing historical quality control logs revealed that it had been about a year and a half since any espresso machine experienced a failure triggered by the shaking machine, indicating that the baseline manufacturing issues had been successfully resolved.
Instead of testing every unit, the factory now uses a batch-testing approach. Out of every run of 40 espresso machines, a sample of nine machines is selected to go onto the shaking apparatus. If even a single unit from that sample displays an issue, the protocol dictates that the remaining machines in that batch of 40 must undergo full vibration testing.
The vibration testing originally revealed that internal electrical wiring connectors were not locking together reliably. This happened because the company was procuring generic locking connectors without tightly evaluating their design tolerances or the tension of their internal springs. Under intense vibration, roughly 1 in 20 of those original springs would shake loose and cause the connector to fail.
To eliminate the loose connections, Decent switched to a high-end cable supplier called BMA Hong Kong. This adjustment caused internal cable costs to spike from 30 cents per cable to about a dollar eighty each, but it allowed Decent to specify exact design metrics for every component. Furthermore, the company introduced a pull-testing protocol where a 20-pound weight is mechanically applied to the locking mechanisms to ensure the spring never fails under real-world stress.