X-bar R Chart
Quality
X-bar R Chart
Control chart pair monitoring process average and within-subgroup range for variable data.
Examples
- 01Every hour, the operator measures 5 shafts and plots the average and range on an X-bar R chart.
- 02The supplier sends X-bar R charts for each key characteristic, and the customer checks both charts, not only the averages.
- 03When the average on the X-bar R chart shifts upwards while the range stays stable, the team looks for a setting change rather than a worn tool.