Application Engineering · Component review guide · Litian Yunde
Matched pairs or interchangeable spares?. Original explanatory schematic; not to scale and not a product test result.
Due metà di guscio che si incastrano formando un unico campione non sono automaticamente intercambiabili all’interno di uno stesso lotto di produzione. Stabilire se le metà devono essere fornite come coppie abbinate o come parti sostituibili indipendentemente l’una dall’altra. Definire quindi i riferimenti di accoppiamento, la corrispondenza estetica e la documentazione richiesta per tale modello di fornitura.
State the pairing strategy
A matched-pair product can retain the identity of both halves through inspection and shipment. A replacement programme needs a different requirement: a new half must fit previously supplied hardware within the agreed scope. State which model applies before approving tooling or samples. Do not promise interchangeable replacement parts solely because several complete assemblies fit individually.
Separate functional fit from appearance
Mating edge geometry, fastener alignment and seal compression concern assembly function. Weave continuity, colour and gloss concern appearance. A replacement half may meet one group of requirements without meeting the other. Identify the visible seam and the cosmetic comparison conditions so the review does not collapse all issues into the word “matching.”
Control reference masters and revisions
If a master assembly or checking fixture is used, identify its revision and how it represents the released product. Record changes to mating features and their compatibility with earlier parts. For interchangeable supply, agree a representative cross-matching plan. For matched pairs, preserve pair identifiers and communicate that replacement of one half may require further review.
Example: a two-piece instrument housing
Initial samples are accepted as complete housings. Later, the buyer asks to replace only the upper shell. The parties discover that replacement compatibility was never specified. They establish a mating reference and a cross-fit review for the replacement programme, while keeping the original matched assemblies identifiable. A cosmetic mismatch is evaluated separately from fastener and seam fit.
Scenario illustrativo, non un caso reale di un cliente né un risultato di produzione riportato.
Dettagli da concordare prima di effettuare l'ordine
| Articolo in recensione | Registrare per confermare |
|---|---|
| Supply model | Matched set or interchangeable spare. |
| Mating references | Seam, locating features, seal and hardware. |
| Appearance criteria | Visible seam and finish comparison method. |
| Compatibility record | Master revision, cross-fit checks and part identifiers. |
Domande poste dagli acquirenti
Does first-article approval establish interchangeability?
Only if the approved inspection scope actually evaluated that requirement.
Should paired halves share one identifier?
Use a traceable scheme that preserves the relationship while identifying each supplied item.
Nozioni tecniche e letture consigliate
Risorsa di riferimento: NPL: Metrologia dimensionale. La checklist del progetto e l'esempio riportati sopra costituiscono linee guida redazionali; il presente documento non certifica alcun componente Litian Yunde.
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Rivedi il tuo componente con Litian Yunde
Indica la revisione del disegno, l'applicazione prevista e la questione relativa all'interfaccia o al collaudo che devi risolvere. I requisiti di costruzione e di accettazione citati sono confermati per il progetto specifico.