ZUFEK
Link the sample to a controlled specification
Record drawing number, revision, material condition and finish. Identify any agreed deviations separately. A loose sample with no revision history can create confusion if it is later used as a master for a repeat order or a manufacturing change.
Define the evidence before making parts
Agree which dimensions, material documents, process records and functional checks are required. The sample plan should follow the actual risk and acceptance requirements. Waiting until parts arrive to request additional tests can delay approval or require another manufacturing batch.
Separate visual and functional approval
Appearance, tool fit and trial assembly can reveal useful information, but they do not replace all drawing checks. Record what each review establishes and who accepts it. If a mating fixture is used, identify its revision and relevant condition as part of the approval record.
Close the feedback loop
Document changes arising from the review and decide whether they require a new drawing revision or another sample. Preserve an approved reference only with a clear record of what it controls. Production release should refer to the final agreed specification rather than an informal message chain.
Specification example
If a trial assembly leads to a longer shoulder, revise the drawing and identify the replacement sample. Keeping the original sample as an unexplained master can reintroduce the superseded dimension on a later order.
RFQ checklist
- Drawing revision and sample identity
- Required dimensional report
- Material and process evidence
- Defined assembly or appearance checks
- Recorded approval and change disposition
Use the RFQ preparation checklist, then submit your drawing for review. For acceptance requirements, see quality planning.
General guidance only. Material properties, tolerances, standards and manufacturing feasibility must be verified for the actual specification. This article does not establish a product performance guarantee.