ISO 2859-3 PDF

Visit asq. The standard requires that: b The product shall not have any critical classes of nonconforming items or nonconformities. Second, if a candidate product carries some critical features dimension of mechanical product , but also carries a number of low risk features, can we apply the skip lot concept only to the non-critical features? And continue to perform lot-by-lot inspection with critical features? Does this mean the AQL value should be less than or greater than 0.

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Visit asq. The standard requires that: b The product shall not have any critical classes of nonconforming items or nonconformities. Second, if a candidate product carries some critical features dimension of mechanical product , but also carries a number of low risk features, can we apply the skip lot concept only to the non-critical features? And continue to perform lot-by-lot inspection with critical features? Does this mean the AQL value should be less than or greater than 0.

CRC Press. The reduction in inspection effort is achieved by determining at random, with a specified probability, whether a lot presented for inspection will be accepted without inspection. A skip-lot sampling plan is also known as a cumulative results plan. In general, such plans require certain assumptions to be met regarding the nature of the inspection process: The lot should be one of a continuing series of lots We expect these lots to be of the same quality The consumer should not expect that any lot is any worse than any of the immediately preceding lots The consumer must have confidence in the supplier not to pass a substandard lot even though other lots are of acceptable quality Under these conditions, we can use the record of previous inspections as a means of reducing the amount of inspection on any given lot.

ISO states the above in 5. It is assumed that the system includes inspection by the supplier of each lot produced and the recording of inspection results.

The underlying assumption here is that the supplier quality is exceptional low nonconforming level. The skip-lot plan is applied to each characteristic, or feature, separately. If several characteristics are present, then try to test for at least one of them. In your situation, if you have critical characteristics you should not be doing skip-lot inspection due to the risk of ignoring skipping a potentially dangerous lot.

On the other hand, you can use a skip-lot plans for non-critical major and minor nonconformities and they will have different AQL levels associated with them. Your listing of AQLs of 1. Critical defects will typically have an AQL less than 1. Your levels of 1. Dean Neubauer U. Share this:.

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