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  Statistical Techniques and 6 Sigma
  How to determine a machine capability?

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Author Topic:   How to determine a machine capability?
posted 07 March 2001 03:11 PM           Edit/Delete Message   Reply w/Quote
I'm trying to determinate a machine and process capability and I have those questions. Can I determine a machine capability measuring only one shaft with a plenty of processed surfaces, then each surface has its own fit tolerance, becouse of its cylinderity? If I can should I consider all fit tolerance measuring results for only one shaft? Or should I consider MIN and MAX measured fit tolerance for a plenty of shafts?
Is it better for the process control to use XR ratio or Xs ratio?

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Rick Goodson
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From:Wuakesha, Wisconsin, USA
Registered: Aug 2000

posted 09 March 2001 11:01 AM     Click Here to See the Profile for Rick Goodson   Click Here to Email Rick Goodson     Edit/Delete Message   Reply w/Quote

This isn't my area of expertise, never the less:

Rule of thumb is that you should run 200 pieces if possible but no less than 50 for a machine capability study. One piece will not give you a time component and therefore will not show linear drift of the process. You also need to take subgroup measurements in order to get subgroup averages and then a grand average in order to determine the shape of the distribution.

Repost your question in the Tooling and Equipment Suppliers Forum. I believe you will find someone there with practical experience in machine capability studies.


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