How do you find process capability?
- Identify the process subjects for measurement.
- Establish units of measure, sensors, and upper and lower specification limits for the selected subjects.
- Operate the process through a number of cycles. (A minimum of 40 observations without any assignable causes are usually needed.)
- Identify and remove any observations that are out of control as the result of assignable causes.
- Construct a histogram of the remaining observations for each subject.
- Evaluate the process capability visually.
- Calculate the Cpk index for each process subject.
The index must, at a minimum, equal 1. 0. Most processes should have a minimum index of 1.33.
- If the process is not capable, identify and eliminate the root causes for excessive variability.
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