iSixSigma

Bruce Floyd

Forum Replies Created

Forum Replies Created

Viewing 3 posts - 1 through 3 (of 3 total)
  • Author
    Posts
  • #82706

    Bruce Floyd
    Participant

    It would be hoped that the process will make product within 3 SD that will work for the customer.  Since you are sampling individuals, there is less concern that averages could cover a wide range in results.  Taking enough consecutive samples to determine the mean and SD are important.  You would not want to go to the customer with a control chart based upon limited data
    It is customary in many industries to present the customer with samples near the midpoint as well as both extremes to varify that the customer can live with the specifications.  This will establish that the customer knows what they want and that everyone has agreed to the specification.  It is always preferable to have the customer agree to your process limits than to have artificial limits impossed upon your process.

    0
    #82698

    Bruce Floyd
    Participant

    Are you setting the +/- 3 SD limits on the average of a subgroup or on the individual samples?  How many samples are in the subgroup, if there is one?  Will the +3SD and -3SD production function as intended? 

    0
    #82662

    Bruce Floyd
    Participant

    Interesting discission.  I am writing an artricle of this subject for a food magazine.  Would any of you care to be interviewed?  Please reply to my email address with telephone number and time you are available. (bfloyd7192 @ aol.com)No one mentioned the spread on the individual sample groups.  There was a time when if the range of the subgroups was outside of the norm, this would spark additional sampling.  This would indicate that the environment had changed.  The average does not tell the whole story.

    0
Viewing 3 posts - 1 through 3 (of 3 total)