The construction process of the control chart:
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It needs data to form any kind of control chart. For this data, it is necessary to collect samples from the whole or data world and then subdivide the data into subgroups. https://bdfabric.com/importance-of-control-chart-in-textile-industries/
The construction process of the control chart-Sampling:
A sample of any process represents that process. And this sample is collected from the data world or population in the sampling method. During sampling, the type of product, the method of processing, and the type of equipment being used are considered. Different quality products need to be sampled separately and also need to take into temperature, humidity, and other factors. A random sampling method must be adopted in sample collection. The data obtained by sampling by biased sampling method will not accurately represent the population. https://bdfabric.com/statistical-quality-control-definition-description/
It is better to collect small-size samples over and over again than to take large-size samples over a long period. Many times it is not possible to accurately distinguish between large and large samples. On the other hand, specimens specify where, when, or from which machine the specimen was collected and how its quality varies.
The construction process of the control chart-Rational segmentation of data:
To properly construct any control chart, the data obtained is subdivided into several subgroups. So that data within the subgroup is affected only by irrevocable variables or if there are any irrevocable variables within it. The subgroup cannot be determined statistically or mathematically correct, it is only done by engineering judgment or technical knowledge.
Advantages of control chart:
The following benefits are available using the control chart.
1. The quality of the product can be maintained and the quality can be increased.
2. The level of irreversible variability of the product is reduced.
3. An early indication of the amount of variation in the quality of the product produced.
4. Reliable reasons are found for taking any action to maintain quality.
5. Proper use of control charts reduces testing and inspection costs.
6. The location of all the difficulties that occur during the day of production is known.
7. Control charts provide a permanent illustrated record of product quality.
8. The control chart gives a basic idea about the production and inspection of a factory.
9. The idea of machine acceptability is found.
Disadvantages of control chart:
1. Control charts do not make sense without extensive knowledge of sampling and testing.
2. Control charts are unimportant without extensive knowledge of statistics.
3. Must be proficient in drawing control charts.
4. Accurate skills are required in the presentation of control charts.
5. If any information in the chart is wrong then all the arrangements are in vain.