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Engineering and manufacturing industries

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Choose the right data for your limits

Article Abstract:

Quality control managers should choose the data samples that are truly representative of their production processes so as to avoid using ineffective process behavior charts. Process behavior charts enable users to characterize processes, identify variations, predict average levels of predictability and characterize the amount routine variation. Selecting the right data subgroups requires practice but doing so would ensure that process behavior charts are formulated and used effectively.

Author: Wheeler, Donald J.
Publisher: BNP Media
Publication Name: Quality
Subject: Engineering and manufacturing industries
ISSN: 0360-9936
Year: 1998
Quality Control Management, Column, Manufacturing processes, Manufacturing, Process control

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Use a decision tree to recalculate control limits

Article Abstract:

The control limits on a statistical process control (SPC) chart are often recalculated for the wrong reasons. A decision tree can help determine the proper time to recalculate control limits. The presence of a statistical pattern on the SPC chart for a known reason means that recalculating should be performed. It is also time to recalculate control limits if the pattern is affecting the process in a positive way.

Author: Cullen, Chad
Publisher: BNP Media
Publication Name: Quality
Subject: Engineering and manufacturing industries
ISSN: 0360-9936
Year: 1996
Statistical process control

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Subjects list: Methods, Evaluation, Quality control
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