Manual data entry with simultaneous display of a new point on the Shewhart control chart, histogram and scatter plot

Simply install a computer with our software at the operator's workstation on the shop floor and start working with production quality at the shop floor, not at the desk level. The workshop is the best place to install our software for operational control of their processes by operators, who in most cases carry out 100% control of the products they produce, in contrast to selective control by quality control department employees.

In online mode, the operator can continue to maintain a control chart and track the position of each new point relative to automatically recalculated or fixed control limits , or boundaries for individual series , and also relatively tolerance limits , presented in a histogram and scatter plot. Analyzing Shewhart control charts in real time is the best way to apply them in practice.

Our software allows the user to reliably interpret the control chart as it is completed, so that it can shed timely light on the nature of the various sources of variability in the observed process. Moreover, the individual use of control charts by machine operators naturally protects the company from problems arising from product mixing from different sources, loss of product chronological order and other information needed for improvement when products leave the operator's station.

“Experimenting with a mixture of foods may worsen the chances of improvement.”

[2] Edwards Deming, "Overcoming the Crisis"
(W. Edwards Deming, "Out of the Crisis")

This function allows you to continue manually entering new data while saving all the settings made by the analyst or operator, while saving the chart settings in the corresponding auto-update group.

Figure 1. Button to go to the control panel for manual data entry into the Shewhart control chart, histogram and scatter plot.

By clicking on the button to go to the manual input control panel, a window will appear notifying you that you need to select the configured schedule from the corresponding auto-update group.

Figure 2. Window with a notification about the need to select a schedule from the auto-update list.

You can select a schedule with all settings, for example, using fixation of control limits or control limits for individual series of subgroups (points) .

Figure 3. Selecting a schedule from the list of the corresponding auto-update group.

If the required schedule is already selected in the auto-update list, you can click the "Cancel" button. This will open the manual data entry control panel.

The "Date and time" field is filled in automatically with the current time. The field for entering values ​​of sources of variations (factors) with a context-sensitive drop-down list is used to record factors (conditions) recorded by the operator that are associated with the resulting value. If the drop-down list of the corresponding type of factors does not contain the required value, the operator can enter a new designation, which will appear in the drop-down list when entering the following points (due to the adaptability of factor directories).

When creating a new point, the factor values ​​are filled in automatically based on the previous point. If you need to change the value of a factor (condition) only in the changed factor type, you will need to select the appropriate value in the drop-down list or enter a new value.

Figure 4. Entering the value of a new point and selecting a factor (condition) from the drop-down list. A drop-down tooltip appears when you hover the mouse over the "Save" button.

The fields of factor types (directories) and sources of variations (factors) allow you to record any changes made to the process, for example, a tool change, a new batch of raw materials, a new source of raw materials, a new measuring tool, operator, etc. - everything that will help identify special causes of process changes identified by the control chart or, conversely, classify such sources of variation as general causes of variability (systemic causes). Such factors can be displayed on a control chart in the form labels for points and/or in the form of vertical dotted lines of zones of action of factors, which can be supplemented by a break in the connecting line of the process progress graph, if necessary.

Figure 5. Arrows on the graphs show where the result of entering a new saved point is displayed.

Figure 6. A drop-down tooltip is displayed when you hover the mouse over the "Delete" button to delete the last point.

Figure 7. A window is displayed for confirming or canceling the deletion of the last point indicated in the screenshot by yellow arrows.

Figure 8. Result of deleting the last point.