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SC controllers maintain both sample and population statistics. Sample statistics are calculated using the last
completed subgroup of fastening cycles for a given Task. The subgroup size is set using Subgroup Size.
Population statistics are calculated using all of the fastening cycles for a given Task up to the population.
To be included in sample or population statistics, a rundown must exceed the Task's Threshold Torque and
Statistical Torque and the fastening cycle must not be marked as a STOP or ABORT shutoff code.
The statistics are calculated for Torque and Angle. Data is filtered by Task. Press the interactive menu button
and choose the Job and Task under analysis.
Values are recalculated each time a tab is selected.
8.3.3.1
Results
This section shows a summary of the fastening cycle data results stored in the controller.
n – Shows the number of rundowns included in the population size.
n OK – Identifies the number of OK rundowns.
n NOK – Identifies the number of NOK rundowns.
n ˄– Displays the number of fastening cycles that exceeded the high limit.
n ˅– Displays the number of fastening cycles that did not achieve the low limit.
n Abr – Displays the number of fastening cycles that were aborted.
n Stp – Shows the number of fastening cycles that were stopped.
R – Shows the subgroup range (highest minus lowest value).
˄ – Identifies the highest value of all the fastening cycles in the population
˅– Identifies the lowest value of all the fastening cycles in the population
The Display parameter under Setup/Other/STATS tab determines which of the following sections are displayed
after the Results.
8.3.3.2
Capability
This section shows the capability statistics for the selected Job and Task.
Cp – Displays the capability index for a stable process.
Cpk – Displays the capability index for a stable process, typically defined as the minimum of CPU or CPL.
CR – Displays the capability ratio for a stable process and is simply the reciprocal of Cp.
CPL – Shows the lower capability index.
CPU – Shows the upper capability index.
R bar – Identifies the average range of a constant size subgroup series.
3 sigma – Displays the sample estimated Standard Deviation times three.
X bar – Displays the value's average (mean).
SC Series Controllers
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