DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
INSPECTION
Sampling is a decision, not a formality.
For a run of hundreds, inspecting everything is usually the wrong answer and inspecting nothing is never the right one. The sampling plan is what makes the difference.
Illustrative inspection checklist
- Material certification
- Traceable to the specific heat supplied
- Thread gauging
- Go and no-go on the declared class
- Counterbore depth
- The dimension that drifts first on a threaded spacer
- Keyway width
- Checked with the correct gauge, not by eye
- Squareness
- On formed parts, after forming rather than before
- Coating thickness
- And whether it is measured before or after plating
- First and last piece
- Measured, because they bracket the run
- Marking
- Batch identifier legible on the part or its bag
An illustrative checklist for a fictional range. A real programme defines the tolerance, the sampling method, the inspection window and the remedy if a batch fails.
The four things a programme needs in writing.
The tolerance, the sampling method, the window in which inspection happens, and what happens if the batch fails. Without all four, a failed delivery becomes an argument rather than a process.
Why the gauge is named.
Because a go/no-go gauge and a measured pitch diameter are different claims. Both can be correct and they do not mean the same thing, which matters when two reports disagree.