How to run quality inspections in a small shop
Run quality inspections at three points: incoming material, in process at a defined operation, and final before dispatch. Each inspection needs a checklist with measurable limits, a sample size, a result per check, the inspector's name, the time, and photos of anything rejected. A failed inspection holds the parts and raises a non-conformance report so the cause is dealt with.
By Arunkumar V, CTO · 03 November 2026 · 2 min read
- how to run quality inspections
- incoming inspection procedure
- in-process inspection
- final inspection checklist
Three inspection points
Incoming inspection checks material and bought parts against the purchase order and the specification before they are accepted into stock: quantity, grade, thickness, certificate, visible damage. In-process inspection checks a part at a step where an error would be expensive to find later, typically after the first-off on a setup and at intervals during the run. Final inspection checks finished parts against the drawing and the customer's requirements before packing.
A small shop does not need all three on every part. Decide per item which points apply and write it on the routing: a tight-tolerance customer part gets in-process checks, a bracket for stock may only get a final check.
Writing a usable checklist
Each check needs a limit someone can measure and a method to measure it. 'Check quality' is not a check. Write the sample size on the checklist so every inspector applies the same rule, and put the checks in the order they are physically done. The rows below are invented examples of the shape; your own limits come from the drawing and the customer specification.
| Check | Limit | Method | Sample |
|---|---|---|---|
| Overall length | 250 mm ± 0.5 mm | Vernier caliper | First-off and every 20th |
| Hole position | Within 0.3 mm of drawing | Go/no-go gauge | First-off and every 20th |
| Powder coat thickness | 60 to 80 microns | Coating gauge | 5 per batch |
| Surface | No scratches visible at arm's length | Visual | 100 per cent |
When a part fails
A failed check holds the affected parts physically and in the system: tag them, move them to a hold location, and record the hold so they cannot be issued or shipped. Raise a non-conformance report with the part, job, step, quantity, what failed and a photo. Then decide: rework, use as is with the customer's written agreement, or scrap. Record the decision and who made it.
If the same failure appears more than once, open a corrective action: find the cause, change the process, routing or supplier, and check later that the failure has stopped.
How to run a quality inspection
- Step 1
Decide for each item which inspection points apply and write them on the routing or the receiving instructions.
- Step 2
Write a checklist per inspection point with a measurable limit, a method and a sample size for each check.
- Step 3
At the inspection point, measure the sample, record each result against its limit and sign with the time.
- Step 4
Photograph and tag any rejected part, move it to a hold location and raise a non-conformance report with the decision and who made it.
- Step 5
File the inspection against the work order or receipt so it can be found by part, job or date.
Where ZMOS fits
ZMOS records inspections with photos and signatures, and links NCRs and CAPA to items and jobs, so a customer query is answered by searching the part or the work order. Custom fields and validation rules let a shop build its own checklist per item without code. It suits sheet-metal, machining and fabrication shops of 10 to 50 people. If you need a full quality management system with document control, calibration and audit scheduling for a certification, a dedicated QMS is the better fit. See quality in ZMOS.
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Inside ZMOS
How big should the inspection sample be?
For a small shop, first-off plus a fixed interval during the run is practical for dimensional checks, and 100 per cent for quick visual checks. Customers with their own sampling plans will specify them, and those take precedence.
Who should do in-process inspection?
Usually the operator, with the first-off signed off by a supervisor or inspector before the run continues. Final inspection is better done by someone other than the operator who made the parts, so a mistake is seen with fresh eyes.
What is the difference between an inspection and an NCR?
An inspection is the planned check with its results, pass or fail. An NCR, a non-conformance report, is raised only when something fails, and records what was wrong, how many parts, the decision taken and who took it.
How should inspection records be stored?
Against the work order or the receipt, with the checklist results, signature, time and photos together, so they can be found by part, job, lot or date years later. Paper files work until the first customer query; a linked record saves a day of searching.
See it on your own stock and jobs
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