Question: Control charts for X and R are maintained on the outside diameter of a shaft. The subgroup size is 04. After 20 subgroups X =

Control charts for X and R are maintained on the outside diameter of a shaft. The subgroup size is 04. After 20 subgroups X = 43.75 and R = 0.286. The specification of the product is 2.150.02 unit. Products falling above and below the specification limit are rejected. The process is statistical controlled and normally distributed. Find the control limits for X and R charts, Process capability, RPI of the process and % rejection. How to reduce the % of rejection if any?

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