MSA Measurement System Analysis measures product dimensions

1. MSA is mainly for a specific size of a certain product, and the round product you are talking about here has a specific size is the measurement data.

2. The dimensions you measure are within the tolerance, but there should be differences between the measured dimensions.

3. When doing MSA measurement system analysis, you must first measure the analysis plan, specifically measure the size, and the measurement is also random, not only to measure a certain position (part, point) of a certain product, if it is so specified, the measurement system analysis loses practical significance.

4. I don't know how you understand the location and size you said, it seems a little confusing.

1. Correct the view on the first floor: MSA has nothing to do with whether the processing process is stable or not; On the contrary, if the product has a stable processing process and good consistency, it is impossible to analyze the compliance of the measurement system when doing MSA;

2. Regarding the "whether you only measure one of the positions of the circle when doing MSA", when MSA analysis, we should try to avoid errors within the specification, that is, measure the same position as much as possible, and measure the point for marking, personnel training and other methods;

3. There will also be a contrary point of view: that is, because of the irregularity of the measured product, the repeatability and reproducibility error of the measurement are large, and the analysis of the measurement system is not compliant;

It mainly depends on the purpose of your analysis, if it is submitted to the customer, choose the former; If it is an internal analysis and a measurement warning, choose the latter;

In the end, our result is that the MSA is compliant through personnel training and measurement method definition...

What are the evaluation metrics for Measurement Systems Analysis (MSA)?

1. Repeatability: the degree of consistency between the indicated values or measured values obtained by repeated measurements of the same or similar measured objects under a set of measurement conditions in the same or similar measured subjects in the same measurement procedure, the same operator, the same measuring equipment, the same operating conditions and the same location, and repeated measurements of the same or similar measured objects in a short period of time.

2. Reproducibility: under a set of measurement conditions in different locations, different operators, and different measuring equipment, the same or similar measured objects are repeatedly measured under a set of measurement conditions, and under the specified conditions, the indicated values or measured values obtained by repeated measurements of the same or similar measured objects are consistent. (Different measurement systems can use different measurement procedures).

3. Stability: The ability of the measurement system to keep its position variation and width variation constant over time.

5. Linearity: the degree of variation in bias within the normal working range of the gage.

6. Consistency of Chaheb: The degree of consistency of judgment results within the system, between systems and between systems and standards in a counting (attribute) measurement system.

When doing MSA, there are strict requirements for the samples to be measured:

1. The sample must cover the entire tolerance zone;

2. Positive and Tai distribution, with more intermediate values and less limit values on both sides;

3. Such as 10 tolerance, 10 take 4, take 1, take 1, take 2, take 2;

This way your MSA reflects the real situation.

The sample must be specially processed, such as 10 tolerance, the sample should be, and other values are available, the limit value sample is less, and the intermediate value sample is more.

Explanation: MSA Principle:

In a certain tolerance zone, with a certain precision measuring equipment, repeatedly and reproducibly measure, how many differences are related, and whether the resolution of the measuring tool meets the requirements, so it must be scattered and cover the entire tolerance zone with the size of the sample;

And what will happen if the samples in the production state are taken immediately, and the product consistency in the production state will be better: because only the measurement of key characteristics will require MSA, and the key characteristics will have PPK requirements.

This leads to a complete contradiction between MSA and PPK samples in PPAP!