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Used when the producer’s recent quality history has been exceptionally good.
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Tightened inspection: Generally used when producer’s recent quality history has deteriorated. 8ĩ ANSI/ASQ Z1.4 Normal inspection is used at the start of inspection with changes being a function of recent quality history. Plan is specified by the AQL, and sample-size code. Provision is also provided for normal, tightened, or reduced inspection. Standard provides for single, double, and multiple sampling plans.
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#Ansi asq z1 4 sampling plan series
Determine the sampling plan ANSI/ASQ S1 Determine whether a lot is accepted or rejected using ANSI/ASQ Z1.9 5Ħ Lot-by-Lot Acceptance Sampling Plans for Attributesĭevised in 1942 at Bell Labs Later became MIL-STD-105E ISO-2859 ANSI/ASQ Z1.4 Wording & terminology changes Additional tables added 6ħ ANSI/ASQ Z1.4 This standard is applicable to: End itemsĬomponents and raw materials Operations Materials in process Supplies in storage Maintenance operations Data or records 7Ĩ ANSI/ASQ Z1.4 Intended to be used for a continuing series of lots, but may be designed for isolated lots. When you have completed this chapter you should be able to: Be able to use the Shainin Lot Plot Method. Determine the sampling plan using the Dodge Romig Tables Construct the OC Curve for a chain sampling plan. When you have completed this chapter you should be able to: Describe the various sampling plan systems and know their function (advantages, disadvantages, purpose etc.). Categorize the various sampling plan systems in terms of lot-by-lot, continuous production, attributes or variables. Know the switching rules for ANSI/ASQ Z1.4. PowerPoint presentation to accompany Besterfield Quality Control, 8e PowerPoints created by Rosida Coowar 1Ģ Outline Lot-by-lot acceptance sampling plans for attributesĪcceptance sampling plans for continuous production Acceptance sampling plans for variables 2ģ Learning Objectives When you have completed this chapter you should be able to: Determine the sampling plan using ANSI/ASQ Z1.4. 1 Quality Control Chapter 10- Acceptance Sampling Systems