FAT Checks for an Automatic Screw Fastening Machine
Buyers should turn screw-size range, torque capability, and automatic feeding into measurable pass or fail checks before accepting an automatic screw fastening machine.
A practical buyer decision is to make the factory acceptance test prove the machine can feed and tighten the smallest and largest screws in the stated M1.0–M5.0 range, not just a convenient mid-size sample. Ask the supplier to run a defined batch at each end of the range and record every missed pick, jam, cross-thread, and rejected fastener.
For torque, treat 4.9 N·m as a catalog reference ceiling, not a promise for every supplied unit. In the request for quotation, ask how tightening torque is set, displayed, and verified, and whether the acceptance test can include repeated fastening into the buyer's actual joint material. A useful pass criterion might be a stated number of consecutive successful fastenings with no manual intervention; a fail would be any unrecorded stoppage or torque setting that drifts.
Also define what counts as a complete cycle: screw presented, driven, seated, and confirmed. Ask for the test fixture, sample fasteners, and acceptance record format to be agreed in advance.
Before requesting a quote, confirm with the supplier which screw sizes and torque values the test unit will be demonstrated at, how feed reliability and torque are measured, what pass limits apply, and whether the acceptance record will be supplied with the machine.