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Bookmark or Share- A Guide to Control Charts - iSixSigmaThe Complete Guide to Understanding Control Charts: How They Work, and Which to Use. Published: September 24, 2024 by Carl Berardinelli
- How to Calculate and Utilize Upper Control Limit - iSixSigmaThe upper control limit is calculated from the data that is plotted on the control chart. It is placed 3 sigma (of the data being plotted) away from the average line.
- Calculate Capability Indices with Only One Specification - iSixSigmaUSL, upper specification limit; LSL, lower specification limit. *Estimated sigma = average range/d2. Common understanding includes the fact that C pk climbs as a process improves – the higher the C pk, the better the product or process.
- Process Capability – The Basics: Part 1 - iSixSigmaUSL = upper specification limit LSL = lower specification limit = estimate of the process’s standard deviation. Conceptually, the standard deviation is the average spread of the data about the mean. Quality guru Dr. Walter Shewhart taught that a process is behaving normally when it varies by no more than ±3. (for a total spread of 6σ).
- Lower Specification Limit (LSL): Get to Grips with Your ProductionYield Improvements Through Comparing LSL and USL. Take some time and compare where the upper and lower specification limits compare with the mean. If you see a shift, where one specification limit is much closer to the mean, and one is much farther away, you may have an opportunity to adjust the process that helps raise or drop the mean to a ...
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