Therefore, in many supplier-buyer relationships (especially if the demand does not result in life or death), the supplier is not expected to deliver goods free of defects. The buyer must control the quality of the purchased goods, because he does not want to have too many defects. But what does «too much» mean? You mean, does it happen that buyers accept a certain proportion of critical defects? I can`t say exactly, but it probably happens. It all depends on the buyer (what is a critical defect and what is the limit for this category of defects). Praveen, first explain what you don`t like about the AQL system, and maybe I can make suggestions. The reason for this is that the AQL ISO 2859-1 definition is simply wrong. The actual definition of AQL is the percentage of defective parts that are regularly accepted by your sampling plan. Therefore, a particular sampling plan for a 1% AQL can actually reject much only if 2% or more is defective. What the 1% means is that if the actual failure rate of your process is 1%, you will still get erroneous rates above 1% due to the random nature of your sample, but sometimes below 2% in 95% of cases. You can think of the actual number of defects that a particular plan allows as the lower confidence limit of the AQL value. How can the boundary between acceptance and rejection be set in a way that can be agreed and measured? That`s where AQL comes in.
Hello, how likely is it that I will accept much more than 1.5% defect if I use AQL 1.5 for inspection? I want to ask you where you got the AQL table from and what is the reference number of the AQL chart document? 0.4 is not one of the «preferred AQLs», so it is probably a typo. It is up to the buyer to decide what constitutes the different classes of non-conformities (major or minor) and the AQL for each. The AQL for everyone can be the same if it deems it appropriate. I can`t pass judgment because I don`t know what kind of product it is, what process was used to make it, etc. In some cases, however, it is enough to check only 5 parts to determine compliance (or lack thereof) without going into depth with a «reasonable» degree of certainty. Note that if you represent the client, you are the party responsible for assessing whether this sampling plan makes sense. If you don`t say it before the inspection, it means that you have delegated this verdict to another party, and protesting after it doesn`t really make sense. Make sure you have agreed on operational definitions of what a defect or defect is. Also make sure that your measurement system is able to identify the defect or defect. Perform a measurement system analysis (MSA) before implementing an AQL process.
The general approach is the same, from what I have seen, with some differences (e.B. the tables are different depending on the net weight of a unit of product). Dear Renaud, AQL 0.65.1.50 does this mean: 65 main defects and 50 minor defects? What do Figures 0 and 1 really mean? txs defects are divided into 3 categories: minor, major and critical. While these may vary from client to client, typical definitions are as follows: A reader asked me about this particular case. Production of 500,000 units is ongoing. An inspection is carried out when 10% of the production is ready. How big is a normal Level II inspection? In our example, you chose level II (the default level). As a general rule, you should choose this most of the time. My question is what is 1.5, 2.5, 4, etc. Is this a percentage of errors? If this is the case, as with AQL 2.5, 5 defects should be allowed. while the table shows 7 allaowed.
What is it? Choosing an AQL is not always as easy as choosing what QC experts or other importers suggest. This does not mean that working for a single importer is also beneficial for you. There are many factors to consider when choosing the best AQL for your conditions. For example: what level of quality your supplier considers appropriate and has planned, the date of exit from the factory and the value of the products in question. Hello. Thank you very much for the informative structure. After reading various articles explaining AQL, it seems that this is a simple value in % that the customer is willing to accept. For example, 2.5 is an indication that the customer is willing to accept 2.5% scrap metal in their lot.
If so, what do AQL values greater than 100 mean? Did I misunderstand something? Please explain what the AQL values greater than 100 indicate The 95% and 10% are determined by the definitions of AQL and LTPD. The 75% is about where the average tends to fall on curves of this type. Is there a document or article that defines the most important and minor defects in a product, or is it up to the company to decide? I will produce equipment for health quality and others, as it is health/medical equipment if there is a document or article that defines the gaps? Hello! In fact, during the inspection, we will encounter these situations and you will have to make the decision whether this butt will occur or not. Suppliers want to know how to ship these cigarette butts or not. So, you should list all the cases, including special cases, the examples I have shown are not very specific. The powerless things are how to convince suppliers that this or that order passes the inspection or does not pass. Sometimes minor deficiencies are above the AQL, but the inspection is successful. If the inspector cannot make a decision about the orders he executes. What will the suppliers think of the inspectors? The two examples I gave you have all passed the AQL, and the Fisrt case is of better quality than the second. The total number of defects must not exceed 24 defects (the first condition) and the main defects must not exceed 10 defects (the second condition). Anyway, thank you for your document, because there are many documents that are very useful for inspectors, I would like to remind you that when carrying out the inspection in practice, logic is very important. .