Control Limit

Statistical boundary calculated from process data to distinguish expected common-cause variation from unusual signals.

Examples

01The control limits on the shaft diameter chart are recalculated from 25 subgroups after a new grinding wheel supplier is introduced.
02In the supplier review, the team checks that control limits are calculated from process data and not copied from the drawing tolerances.
03When a point falls outside the control limit, the operator stops the machine, segregates the last parts and follows the reaction plan.