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  Statistical Techniques and 6 Sigma
  stability studies

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Author Topic:   stability studies
robert hollingsbee
Lurker (<10 Posts)

Posts: 1
From:brampton, Ontario
Registered: Oct 2000

posted 04 October 2000 10:08 AM     Click Here to See the Profile for robert hollingsbee   Click Here to Email robert hollingsbee     Edit/Delete Message   Reply w/Quote
Hi, I'm new to the world of stability studies and i need some help understanding
how to go about performing these. I have read a few books and they still confuse me I have a program that will calculate all of the percentages but i don't know what is considered as being acceptable
ie: 80% ok/not ok what is the specific number related to acceptability. As well choosing your user groups and group size. I have tried a few different methods and have come up with some interesting numbers
ie: 25%/400%/80000% just by manipulating data for these different results. If anyone could help me out i would be a very happy man.


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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA

posted 17 October 2000 09:47 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Can anyone shed any light on this? I'd sure like to hear from someone with experience in stability.

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Al Dyer
Forum Wizard

Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 17 October 2000 10:51 AM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote

A method that has proven helpful and cost effective:

We use a simple X-R chart to monitor the stability of a gage. As long as you use the same standard (master)and perform the study on a timely basis the Cpk can be monitored over time.

On a weekly basis we measure the standard five times and calculate an ongoing Cpk. This type of graphic presentation works for internal personnel and auditors. Over time we can determine if frequencies are adequate and if masters (standards) and/or gages are wearing.

These records are reported as part of management review fed into a continuous improvement program.


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