• Examples of variable control chart calculations and their relationship to six sigma

    17-08-2017

    Examples of variable control chart calculations and their relationship to six sigma

    These examples were developed to show the relationship of variable control charts and six sigma. They can be used as guidelines for communications between an enterprise and its suppliers.Example 3.2aA...
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  • Control chart guidelines, out of control conditions, and corrective action procedures and examples

    17-08-2017

    Control chart guidelines, out of control conditions, and corrective action procedures and examples

    Figures 3.2 and 3.3 are examples of X and R charts showing the solder paste height deposition process for a surface mount technology (SMT) process. Several observations can be made from examining thes...
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  • Alternate methods for calculating control limits

    17-08-2017

    Alternate methods for calculating control limits

    The control limits are set to three times standard deviation of the sample distribution (s). s can be calculated from a the population standard deviation using the factor d2 according to the central l...
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  • X, R variable control chart calculations example

    17-08-2017

    X, R variable control chart calculations example

    Example 3.1In this example, a critical dimension for a part is measured as it is being inspected in a machining operation. To set up the control chart, four measurements were taken every day for 25 su...
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  • Variable Control Chart Limits

    17-08-2017

    Variable Control Chart Limits

    The control limits for the control charts are calculated using the following formulas and Table 3.1 for control chart factors. The control chart factors were designated with variables such as A2, Ds, ...
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  • Control of Variable Processes and Its Relationship with Six Sigma

    17-08-2017

    Control of Variable Processes and Its Relationship with Six Sigma

    Variable processes are those in which direct measurements can be made of the quality characteristic in a periodic or daily sample. The daily samples are then compared with a historical record to see i...
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  • Manufacturing Variability Measurement and Control

    17-08-2017

    Manufacturing Variability Measurement and Control

    Control charts have been traditionally used as the method of determining the performance of manufacturing processes over time by the statistical characterization of a measured parameter that is depend...
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  • Checking for Normality Using Chi-square Tests

    17-08-2017

    Checking for Normality Using Chi-square Tests

    Chi-square(X 2)  tests can be used determine whether a set of data can be adequately modeled by a specified distribution. The chi-square test divides the data into nonoverlapping intervals calls ...
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