Control limits come from the process, not from the tolerance24.9924.9952525.00525.0125.01525.02subgroup mean (mm)X-bar chart (n=5), limits from the first 30 subgroupsrun of 7 on one sidebeyond 3 sigmacontrol limits10203040506000.0050.010.0150.020.025subgroup numbersubgroup range (mm)R chart: spread is unchanged, so the fault is in the meanControl limits come from the process, not from the tolerance