A supplier is producing a machined part for the transmission of a vehicle. The upper specification limit is 0.135 cm, and the lower specification limit is 0.075. The process standard deviation for the process that makes this part is 0.005, and the process average is 0.105. What conclusion can be drawn from these process capability data?
A)The process is centered and capable.
B)The process is not centered and capable.
C)The process is centered and not capable.
D)The process is not centered and not capable.

Question

Quizplus · Accepted Answer

The process standard deviation and the difference between the upper and lower specification limits must be taken into account when evaluating process capability. Using the process capability index (Cpk), we can determine whether the process is centered and capable. In this case, since the process average is within the specification limits and the Cpk value is greater than 1 (Cpk = 2.0), we can conclude that the process is both centered and capable of producing parts that meet the specifications. Therefore, the best choice is A.

A Supplier Is Producing a Machined Part for the Transmission