Micro Quality Controls

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Micro Quality Controls and Accreditation Service asks that you remember that once a company's leadership in Quality is a...
10/02/2018

Micro Quality Controls and Accreditation Service asks that you remember that once a company's leadership in Quality is attained, it may profit from this leadership for years, decades and possibly......, centuries. Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com) provides assistance to area .

The previous post dealt with parts ARRIVING at YOUR company for sampling and inspection. THIS post deals with YOUR parts...
09/27/2018

The previous post dealt with parts ARRIVING at YOUR company for sampling and inspection. THIS post deals with YOUR parts being RETURNED. You visit your company's "off-site" storage facility and discover hundreds of boxes of your company's products returned by your customer over the past year for failing "acceptance sampling criteria". WHAT DO YOU DO??? Clearly, a major investigation into this issue needs to be done but, what do you do NOW? Micro Quality Control and Accreditation Service (www.microqualitycontrols.com.) would recommend that you:
1. contact your customer and see if they are STILL your customer,
2. assess if their "acceptable quality level" changed,
3. determine if their "specification limits" changed,
4. if the customer's criteria have changed, bring your production standards into agreement with those required by your customer,
5. if the customer's criteria have NOT changed, inspect EACH piece of the returned lots and using a Pareto Chart, determine the cause for failure,
6. effect corrective production procedures,
7. adjust/rebuild EACH of the "defective" returned items and submit them to your customer, and
8. initiate and develop a Statistical Process Control Program for your company to ensure that a mistake of this type does NOT happen again. Micro Quality Controls and Accreditation Service provides assistance to area .

Your supplier has been providing many "lots" of parts over the past and acceptance sampling has been free from defects. ...
09/26/2018

Your supplier has been providing many "lots" of parts over the past and acceptance sampling has been free from defects. Yet.., both you and your supplier KNOW that there is no such thing as perfection in the production and service industries. The next lot has ONE defective item. Days later, another defective item is found. What do you do? Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com.) suggests that you realize that a small number of defective items is to be expected now and then. This belief is ONLY justifiable if:
-the supplier can demonstrate that there has been NO change in its production process, personnel or raw materials,
-statistical process control is shown by the supplier to be constant,
-and the lot with the defect is one of a continuous series of lots.
Micro Quality Controls and Accreditation Service provides assistance to area .

Many weeks ago (on 5-11-2018), Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com.) presente...
09/25/2018

Many weeks ago (on 5-11-2018), Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com.) presented a post about Operating Characteristics Charts and their use in Acceptance Sampling: which is the acceptance/rejection of lots from a supplier based upon the inspection of a few samples from those lots. The post stated that: "there is much that could and should be said about these charts...". THIS post continues with more information about operating characteristics and acceptance sampling. For the SUPPLIER, they require that products and services are made correctly, encourages large lots sizes and allows for a "second chance" to pass inspection. For the PURCHASER, they provides a measure of safety that the product and service is free of defects and minimizes inspections costs. Should these topics be confusing, additional information can be obtained by referencing articles about: operating characteristics, acceptance sampling and lot inspection. Micro Quality Controls and Accreditation Service is also available to explain this difficult subject. Micro Quality Controls and Accreditation Service provides assistance to area .

How good is good? Can better be better? These philosophical questions might be answered by considering standard deviatio...
09/24/2018

How good is good? Can better be better? These philosophical questions might be answered by considering standard deviations, also known as "Sigma Control Limits". These control limits may be very useful in determining how "good" your company's product or service is OR can be. Making a "better" product or service may also result in reduced costs, a reduction in spoilage and waste, reduced inspection requirements and INCREASED sales. Micro Quality Controls and Accreditation Service provides assistance to area .

Licensure and Accreditation can show your customers not only that your company has attained a prescribed level of profes...
09/21/2018

Licensure and Accreditation can show your customers not only that your company has attained a prescribed level of professional achievement but also indicates that your company continues to address future requirements. Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com.) provides assistance to area .

This is the 5th and final post by Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com.) about...
09/20/2018

This is the 5th and final post by Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com.) about Pareto Charts and presents cautionary points about its use. Some of these are:
1. the Pareto chart identifies only the most frequent "reasons for failure", NOT the most important.
2. If the "reasons for failure" differ in their seriousness, a "weighting scheme" might be used.
3. The "other" category must be used with care. If too many "reasons for failure" are grouped into the "other" category, this may make it a greater percentage than the "most frequent" category.
4. It would be best if a "team" of those most familiar with the production process be involved and that they use insight and ingenuity in generating the chart.
5. It may be helpful to develop a "cause-and-effect" diagram BEFORE starting the Pareto chart. The identified "causes" would then be used in a check sheet and subsequent Pareto chart.
6. The shape of the Pareto curve indicates if further actions are possible.
Micro Quality Controls and Accreditation Service provides assistance to area .

This is part 4 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.) and describes how the Paret...
09/18/2018

This is part 4 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.) and describes how the Pareto curve is drawn. At this point, there should be a percentage AND a cumulative percentage for EACH of the error categories. Note that the percentages for the first category will be the same. Using new graph paper, create a x-y graph placing the error categories on the horizontal (x) axis (as done in the previous graph) and percentages (zero to 100%) on the vertical (y) axis. Using the calculated percentages, draw boxes above each of the error categories and extend each box up to the percentage for that category. Above each box, place a point corresponding to the CUMULATIVE percentage for that category. Connect each point with a line. The final point, which should lie above the last category, should be at 100%. From the resulting curve, it should be evident that the majority of problems are caused by a few types of errors. The 5th post will present cautionary points about using the Pareto Chart. Micro Quality Controls and Accreditation Service provides assistance to area .

This is part 3 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.) and describes how errors ar...
09/17/2018

This is part 3 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.) and describes how errors are tabulated and quantified on a Pareto Chart. Organize the errors from most to least frequent. If there are several errors that occurred once or twice, they may be combined into an error category called "other" but..........beware: the "other" category must be used with care. List the number of occurrences for each error, including the "other" category. Determine the total errors of each and use that number to determine the percentage of each type of error. Determine the cumulative percentage for each error by adding the percentage of the first error to the percentage of the second error. This is repeated for the remaining errors. The total cumulative error should be 100%. The 4th post by Micro Quality Controls will describe how to determine the curve and act upon the information presented on the Pareto Chart. Micro Quality Controls and Accreditation Service provides assistance to area .

This is part 2 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.). There are many variations ...
09/14/2018

This is part 2 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.). There are many variations of the Pareto chart all of which are equally applicable to manufacturing and service companies. Regardless of the type of chart, each plots the "reasons for failure" (on the horizontal axis) and the frequency of each failure (on the vertical axis). Determining the "reasons for failure" is often the FIRST step in developing a Pareto chart and may take, depending on the rate of production, days, weeks or months. Since it is unlikely that the company's management have an accurate idea of the types of defects responsible for a product's failure, a TEAM of company personnel, familiar with the production process, should identify the types of failures and document their characteristics. Considerable ingenuity and attention to detail is required to ensure that all "reasons for failure" (errors) are listed and that causal relationships may exist. The errors are listed on a "check sheet" and the production staff are trained to recognize each and record when one or more are encountered during the production process. Error data is tabulated on the check sheet and collected over a period of time until all possible errors are realized and a "distribution" is formed. The 3rd post will describe how these errors are tabulated and quantified. Micro Quality Controls and Accreditation Service provides assistance to area .

This is part 1 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.). Your manufacturing or serv...
09/13/2018

This is part 1 of a multipart post by Micro Quality Controls (www.microqualitycontrols.com.). Your manufacturing or service company monitors only PASS/FAIL criteria in its Quality Control and Assurance program. Though valuable in ensuring that only the BEST product is delivered, pass/fail criteria may not be informative for the company's management, developers and employees. This "binary" data (pass/fail) might become more useful if the REASONS for failure can be identified. Quantification of these "reasons for failure" can be done in a Pareto Chart and the relative importance of each reason can be studied. Micro Quality Controls and Accreditation Service provides assistance to area .

DON'T TOUCH THAT machine set DIAL!!!! A shift in the MEAN may be temporary and a matter of CHANCE! Check your X(mean) an...
09/12/2018

DON'T TOUCH THAT machine set DIAL!!!! A shift in the MEAN may be temporary and a matter of CHANCE! Check your X(mean) and R(dispersion) charts to assess the "presence" of a shift in the MEAN. Micro Quality Controls can help you identify these shifts and determine if corrective measures are needed. Micro Quality Controls and Accreditation Service (www.microqualitycontrols.com) provides assistance to area .

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Kent, WA
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