A batch of machined lugs passes every dimension on the CMM. It still sits in quarantine for four days. The traveller shows an operation stamped by someone not authorised for that step, and the heat number from the mill certificate was copied with two digits swapped. The parts were fine. The records were not, so the parts could not leave.
Our aero and defence supplier overview lists this among five recurring people problems. Happily, it yields quickly, because the same few mistakes recur.
Where record errors appear on the floor
- Traveller or route card: operations stamped out of sequence, a stamp box left blank, or a stamp from a person not cleared for that operation.
- Revision letter: the operator machines to a superseded drawing still pinned at the control, while planning holds the current issue.
- Ballooned dimensional report: a balloon skipped, a reading written against the wrong characteristic, or a value entered in the wrong unit.
- Material and heat traceability: heat numbers mis-copied, offcuts used without transferring the identity, certificates not attached to the batch.
- Corrections: overwriting, whitener or a scribble instead of a single strike-through with dated initials.
- Gauge identity: readings taken with an instrument whose calibration tag has lapsed, or with no serial recorded at all.
The price of a quarantine hold
Time goes first. Parts wait while quality traces the error, raises a deviation or asks the customer for a concession. Delivery slips, and the customer's buyer starts to watch your shipments closely. The indirect cost lands on people. Inspectors spend evenings re-checking travellers instead of inspecting. Operators feel accused. Good inspectors leave for plants where the paperwork arrives clean.
Why the errors keep returning
Most units teach the machine and assume the paperwork. A new operator learns stamping from whoever stands nearby, including that person's shortcuts. Revision changes travel by word of mouth. Night shifts have nobody from quality on hand to ask. And the review sheet rates output and attendance, so a careful record keeper gains nothing for being careful.
Inspectors face their own version. A CMM programmer may print a full report while the customer wants readings only against ballooned characteristics. A final inspector may countersign a traveller without opening the material certificate. Neither habit is laziness. Both come from never being shown what the customer's receiving inspector actually checks. Bring one returned report into the inspection room and walk through every query the customer raised.
A step-by-step fix
- 1
Collect a month of record errors
Ask quality for every quarantine hold and returned traveller. Sort them by type: stamp, revision, traceability, correction, gauge. One or two types will dominate.
- 2
Build an induction module from a real traveller
Use a cleaned-up traveller and ballooned report from a past job. Walk the new joiner through each box, each stamp and each correction rule beside the machine, never in a meeting room.
- 3
Check the first sheets together
For the first fortnight, the cell lead or an inspector reviews every traveller the joiner touches, before the batch moves on. Small errors get fixed while they are still small.
- 4
Publish a stamp authority list
Show which person may stamp which operation, by name and grade, beside the stamp register. Update it whenever someone qualifies or leaves.
- 5
Make revision withdrawal a named job
The planner or document controller removes superseded prints from the control and records that they did. Operators confirm the revision letter before the first-off.
- 6
Audit a sample weekly and feed back without blame
Pull a handful of travellers per cell, score them and share the error types at the shift meeting. Name the cleanest record keepers aloud.
- 7
Put record quality into review
Add record accuracy to operator and inspector review criteria, using the weekly audit as evidence.
Cell: ______ Week: ______ Auditor: ______.
Traveller or batch number: ______ Part and revision letter: ______.
Every operation stamped in sequence? Yes / no.
Stamp holder authorised for each operation? Yes / no.
Revision on traveller matches print at the machine? Yes / no.
Heat number and certificate attached and matching? Yes / no.
Dimensional report complete against every balloon? Yes / no.
Corrections made by single strike-through with dated initials? Yes / no.
Gauge serials recorded and calibration tags current? Yes / no.
Error type if any: stamp / revision / traceability / correction / gauge.
Fed back to: ______ Date: ______.Filling the sheet: who and when
An inspector or quality engineer completes the sheet for a small sample of travellers in each cell every week. The cell lead receives the summary. Monthly, the HR lead or works manager reviews the trend per cell and per service band. A spike among joiners points at induction. A spike after revisions points at document control.
Keep the audit light. A sheet that takes an inspector most of a morning will be skipped in the first busy week. Pick travellers from different shifts and different operators, and include at least one from a joiner still in probation.
Our people records process work keeps the people side straight: who is authorised, who was trained and when. For the joining side, the joining routine for defence parts suppliers sets out where record habits sit into the first weeks. The CNC parts training page covers the shop-floor teaching that goes with it.
