Can I have sloping limits?

Article Abstract:

Manufacturers may be able to track changes in processes efficiently and accurately through the use of process-behavior charts. In designing process-behavior charts, sloping limits must be included in order to ensure that allowances and departures from the norm are properly accounted for. Conditions that involve steady-state processes require horizontal central line. However, for processes that manifest natural drift, a central line must be applied in conjunction with a trend line in order to keep track of the overall drifting data.

Methods, Evaluation

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When do I recalculate my limits?

Article Abstract:

Manufacturing industry quality control managers can determine if a recalculation of their control-chart limits is in order by referring to Walter Shewart's charts. Other industry managers suggest as four point system which evaluate factors including fluctuations in data display behavior, analysis of any observed behavior change, and general assessment of any new process behavior. Managers can also refer to Shewart's Three-Sigma limits to ensure accurate computation of control-chart limits.

Standards, Management, Manufacturing industry, Manufacturing industries, Quality control, Control systems, Quality control charts, Statistical process control

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The origin of specifications

Article Abstract:

Specification is meant to separate the good parts from the bad ones. This idea dates back as early as 1793 with Eli Whitney's parts intechangeability problem. From there, the approach undergoes revolutionary reforms as manufacturers strive to look for a better way to break an endless cycle of product fabrication, inspection, and rework. The solution comes with the introduction of process-behavior charts, a tool that ensures continual improvement of both process and product.

History, Specifications

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