Control Chart Diploma For Free

Statistical Process Control (SPC) Charts Rule 1 = Any point outside the control limits. Rule 2 = Seven consecutive points all above or all below the centre line, or all increasing or decreasing: Rule 3 = Unusual pattern or trends within the control limits:

What are the 7 basic QC tools? Scatter diagrams, Pareto charts, control charts, histograms, stratification, fishbone diagrams and check sheets.

On a control chart, when seven consecutive data points fall on the same side of the mean, either above or below, the process is said to be out of control and in need of adjustment. All the seven points may be within the control limits. Such a situation is not considered normal (or common) and warrants an investigation.

Step 6: Calculate Control Limits Once you have started collecting data (usually 20 ? 25 data points) you can calculate the upper and lower control limits, usually three standard deviations from the mean.

Basic Procedure Choose the appropriate control chart for your data. Determine the appropriate time period for collecting and plotting data. Collect data, construct your chart and analyze the data. Look for "out-of-control signals" on the control chart. ... Continue to plot data as they are generated.

Types of Control Charts X-Chart. X-Charts present variable data. ... P-Chart. P-Charts are used for data that is counted. ... NP-Chart. NP-Charts are used to present the number of nonconforming or conforming items. ... C-Chart. ... U-Chart. ... MR-Chart. ... Individual MR-Chart. ... Custom Data Control Chart.

These seven basic quality control tools, which introduced by Dr. Ishikawa, are : 1) Check sheets; 2) Graphs (Trend Analysis); 3) Histograms; 4) Pareto charts; 5) Cause-and-effect diagrams; 6) Scatter diagrams; 7) Control charts.