Selection · Design · Acceptance

Passing Overall Means but Assembly Failures: Separate Mold Cavities

Measurement, Quality and Procurement
Key point: An acceptable batch mean can hide persistent cavity differences. Group data by cavity and period before discussing overall statistics.
Passing Overall Means but Assembly Failures: Separate Mold Cavities — three-step review diagram
Original engineering review illustration; not a test record.

Scope and common interpretation errors

For cavity-traceable data analysis, not a substitute for a complete capability study.

High and low groups can cancel in the mean while individuals remain out of tolerance. Mixed process stages also create hard-to-interpret distributions.

Custom Shaped Silicone Parts — existing product photograph for structural reference
Existing product photograph from this website. It illustrates structure; it does not establish that the part passed this article’s tests or suits every operating condition.

Turn the review into recorded checks

StepAction and evidence
1 · Keep grouping fieldsLink every value to cavity, time period and method.
2 · Plot within-group dataReview individual values, means and ranges rather than only a grand mean.
3 · Investigate fixed sourcesCheck tooling, sampling and measurement for shifted groups and start a separate confirmation segment after correction.

A comparison to avoid misinterpretation

Two cavities near opposite limits can yield an attractive overall mean without proving either cavity stable. Validate them separately.

Passing Overall Means but Assembly Failures: Separate Mold Cavities — scope and decision reminders
Original decision-check illustration. Examples are not Chengxin test data, customer cases or universal acceptance limits.

Frequently asked question

Can the worst cavity be excluded to improve the calculation?

Only a predefined evidence-based exclusion rule can justify removing data.

Background and further reading

This note addresses one specific question. For broader concepts, see the related background guide.

Related question: Conditioning Silicone Before Inspection: Temperature, Time and History.

External references support the relevant concepts. The review steps and scenarios are independent engineering discussion guidance, not quotations from a standard or external organization. Use agreed methods, applicable document revisions and complete conditions.

Apply this to your custom part

Compare the structure with Custom Shaped Silicone Parts. Describe the application, geometry, operating conditions, quantity and problem to solve. Submit a custom-parts inquiry, or see how to send drawings and sample photographs by business email. Confirm material, dimensions, costs, testing and delivery requirements for the project.

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