Preventing Factory Retention Claims over Customer Owned Injection Moulds
Preventing factory retention over customer injection moulds demands PRC fapiao tax invoices, steel asset stamping, and pre-suit court preservation clauses.
CMM Dimensional Inspection Audit
Meaning
Precision quality verification procedures using coordinate measuring machines evaluate manufactured component dimensions against engineering CAD drawings. Quality control teams execute a CMM dimensional inspection audit to verify tool dimensions before approving full production runs. The physical measurement process stops applying when components exhibit surface coatings or thermal treatments that require non-contact optical evaluation instead.
Measurement Method
Multi-axis physical probes map physical coordinates on machined tooling surfaces to extract geometric measurements. The inspection program calculates linear distances, hole diameters, surface flatness, and true position tolerances relative to defined reference datums. Temperature-controlled inspection rooms maintain zero ambient thermal expansion, ensuring physical probe readings match nominal digital CAD specifications.
Discrepancies identified during probing highlight mechanical machining errors or mold steel shrinkage before expensive mass production begins.
Acceptance Threshold
Component approval relies on critical dimension conformity within tolerance bands specified in technical drawings. Out-of-tolerance dimensions trigger mandatory tool rework and secondary verification testing before component release.
Audit Execution
Third party inspection agencies produce formal measurement documentation listing measured dimensions alongside nominal engineering standards. The CMM dimensional inspection audit report serves as legal proof of component conformity in tooling purchase agreements. Unfavorable measurement reports justify rejection of pre-production samples and withholding of milestone tooling payments under supply contracts.