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Samples in periodicals archive:
Hence, the control limits which are the upper control limit (UCL) and the lower control limit (LCL) are calculated for the I-MR charts.
A control limit is exceeded if the total is far enough from zero.
on a chart with the center line CL = 0 and upper control limit at UCL = 3 and lower control limit at LCL = -3.
But in order to fully benefit from SPC, effective control limits must be maintained at all times.
One-half or more of the averages should fall outside the average chart control limits for the measurement system to be adequate to detect part-to-part variation and to provide useful data for controlling the process.
Engineers or operators can set control limits for charts, or alternatively, SPC Server can calculate these limits automatically based on standard methods.
Other related practices are to use a manufacturer's claim for method performance as the SD to calculate control limits or a manufacturer's "acceptable range" as a fixed control limit.
Higher Care, Custody and Control limits are available upon request.