Quick answer: When repeat measurements on the same part vary with mounting, datum or contact conditions.
When should the test setup be suspected?
Scatter between parts and scatter from reinstalling one part are different problems. Evaluate fixture repeatability before tightening manufacturing limits. Keep setup instructions and component positions fixed, and record any adjustment during measurement.
A practical verification method
Remove and reinstall one identified sample repeatedly, then compare that spread with the batch spread.
| Item | What to record | Purpose |
|---|---|---|
| Reference configuration | Part or assembly identity and drawing revision | Make comparisons traceable |
| Test conditions | Relevant position, direction and operating condition | Compare the same characteristic |
| Decision evidence | Remove and reinstall one identified sample repeatedly, then compare that spread with the batch spread. | Resolve the specific question before approval |
Use the result in an engineering request
Describe the observed condition and the required function separately. Include the relevant drawing revision and your results from the check above. If an acceptance limit has not been established, identify it as an open design input rather than treating a successful trial as approval.
Review the related Leading Spring product information. For a project-specific review, send the mechanism description, available geometry and the evidence relevant to this decision through the contact page.
Editorial note: AI-assisted engineering guidance, prepared from the topic-specific reasoning shown here and the company’s public product context. Illustrations explain decisions; they are not customer-case photographs or test results. Product-specific suitability requires review against your approved requirements.