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Hello,
When i read about the reference figures concerning how to determine the process variation page 120-121 in reference manual MSA 4 th edition i need some help to determine what this mean:
1) using process variation
-process variation , taken from parts in the GRR study itself
-use when selected parts represents the expected process variation (preferred option)
2) surrogate process variation
-use when sufficient samples to represent the process are not available but an existing process with similar process variation is availble.
3) Pp (or Ppk) target value
-use when sufficient samples to represent the process are not available and an existing process with similar process is expected to have less variability then an existing process.
4) Specification tolerance
-when the measurement system is to be used to sort the process, and the process has a Pp<1.0.
Correct me if i am wrong but option:
1) means % Study Var in Minitab
2) means option % Process in Minitab. (Historical standard deviation has to be entered)
3) means also % Process in Minitab (Use standard deviation from a new process with a less variability)
4) means % Tolerance
Thanks in advance!
When i read about the reference figures concerning how to determine the process variation page 120-121 in reference manual MSA 4 th edition i need some help to determine what this mean:
1) using process variation
-process variation , taken from parts in the GRR study itself
-use when selected parts represents the expected process variation (preferred option)
2) surrogate process variation
-use when sufficient samples to represent the process are not available but an existing process with similar process variation is availble.
3) Pp (or Ppk) target value
-use when sufficient samples to represent the process are not available and an existing process with similar process is expected to have less variability then an existing process.
4) Specification tolerance
-when the measurement system is to be used to sort the process, and the process has a Pp<1.0.
Correct me if i am wrong but option:
1) means % Study Var in Minitab
2) means option % Process in Minitab. (Historical standard deviation has to be entered)
3) means also % Process in Minitab (Use standard deviation from a new process with a less variability)
4) means % Tolerance
Thanks in advance!