Question: 2 2. Samples are being taken from a pin manufacturing process every 1520 minutes. The production rate is 350 400 per hour, and the specification

2 2. Samples are being taken from a pin

2 2. Samples are being taken from a pin manufacturing process every 1520 minutes. The production rate is 350 400 per hour, and the specification limits on length are 0.820 and 0.840 cm. After certain number of subgroups in samples of 5 pins, the following information is available: 120 X = 16.68 cm; 22 Ri = 0.14 cm i= (a) Determine the control limits of 7 and R charts respectively. (b) On the assumption that the pin lengths are normally distributed, what percentage of the pins would you estimate to have lengths outside the specification limits when the process is under control at the levels indicated by the data given? (e) Evaluate the Cp and Cpk values of the process. Comment the process capability. (d) What would happen to the percentage defective pins if the process average should change to 0.837 cm

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