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Quality Tools to Identify Quality Problems

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  • #28195

    muhannad al nabulsi
    Participant

    ONLY TO BE ANSWERED BY Q. EXPERTS, PLEASE:
    Describe some tools and techniques that are useful to identify quality problems in a.production organizations,and b.service organizations.
              thanks for  help, regards                                   MN

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    #69897

    Jaran S.
    Participant

    Many tools can be used to identify quality problems.
    But the problem is how to use the right tools at the right places.
    The one come my mind when I read your question is :
    Pareto of somthings, such as :
    – Pareto of COPQ
    – Pareto of defect rate
    – Pareto of FPY
    – Pareto of Six Sigma level
    – Pareto of Pareto of COPQ
    – Pareto of ……. etc.
    Conclusion : One of the best tools to identify quality problems is :
                      ” Pareto of right thing “
     

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    #69910

    muhannad al nabulsi
    Participant

    Thanks,what do you by pareto of COPQ,pareto of FBY,please.
                       Thanks & Regards.                                 MN

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    #69912

    Schmidt
    Participant

    Just create a pareto chart for each dimension you wish to track. 
    Marcus

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    #69930

    Jaran S.
    Participant

    COPQ —- Cost of Poor Quality
    FPY   —– First Pass Yield
    You just create pareto of these metric and will find some information to identify quality problem.
    One more thing, it is important make pareto of the right metric.
    What is the right for each organization?
    I don’t know. All are different. The organizations have to find the best ones for themselves.
    Jaran S.

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    #69942

    Muhannad Alnabulsi
    Participant

    Hi Jaran
    Thank you for willing to help,I understand the first concept,but could you give example of the second (fby),if possible,by the way I admire your sound  quality knowledge,I should ask  all other experts to act in a similar humble way.thanks.                Muhannad

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    #69978

    Jaran S.
    Participant

    FPY  …. First Pass Yeild is a Six Sigma metric.
    It is the proability the product can go throuh series of subprocess (or steps) without defect and rework.
    Suppose you have a process with 3 subprocesses (or steps).
    Step 1 has 90% yield, step 2 — 80% yield and step 3 — 70 % yield.
    FPY is 0.9 X 0.8 X 0.7 X 100 %.
     

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    #70000

    muhannad al nabulsi
    Participant

    Hi JARAN
    Thank you,admiring your ability to give brief concrete answers,so I was correct when I recommended only EXPERTS to answer question ,so to avoid miss-guiding.    regards    MN

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    #70206

    Rich M
    Member

    Using the FPY measuring system, how do you calculate rework in your equation?  Presently we count the part as not passing the first time. We then count it as “good” going into the next station after the part has been reworked. Does this sound reasonable? 
    Thanks for your comments.        Rich M.

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    #70225

    muhannad al nabulsi
    Participant

    Thanks,I’m not an expert in this topic,I would rather expect more details from you,thanks in advance.                    MN 

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    #70263

    Rich M
    Member

    First Pass Yield – Example 1 Calculation – Is the treatment of the “rework” numbers reasonable? Rework is counted as scrap at that station, but is included as good coming into the next station. Work is done at each station creating good, scrap and rework.
                          Station 1     Station 2     Station 3   Packed
    Total Pcs In        100             95               93           89
    Scrap                      5              2                  4
    Rework                   3              0                 7
                           0.92   X  0.979   X   0.882 =  0.794 X 100 = 79.4%
    Example 2 – Rewok not addressed, counted as good, because the part eventually goes to the next station. Same numbers as above:
                         0.95  X   0.979  X   0.957 =  0.890 X100=89.0%        
    Some do not include rework into their calculation, but the “rework” parts did not get thru the station in the “first pass”!  Do you agree wtih the treatment of the rework numbers? 
    We use example 1 calculation.  Comments.
     

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