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flatness inspection

Six Sigma – iSixSigma Forums Old Forums General flatness inspection

This topic contains 2 replies, has 2 voices, and was last updated by  AT 13 years, 3 months ago.

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  • #43849

    AT
    Participant

    I have to set up an inspection criteria to check the flatness of fifth wheel plate ( this is very heavy plate about 280lb, which connects trailer to the main truck also called kin pin plate). I decided to inspect the plate in a heavy flat table and will check  all four rectangular edge by inserting 1/8″ thick aluminum plate, this will tell us is there any gap between flat table & fifth wheel plate. If we will find any gap than it will be considered as defect.
    We produced only 200-250 in a month. It is very tough to do this inspection coz its too heavy and is very hot during production. it takes about 3 hours to cool down. I am planning to do p or, np chart but it requires large no of sample size. I can inspect max 8-10pieces out of 200.
    So, I am very confused which chart do I have to create. Please let me know if you have any idea.
    Thanks
    Ramesh

    0
    #139659

    sixsigmadeewana
    Member

    Since the check is a Pass or Fail you would need to use attribute charts. Is the flatness spec. so strict or can you allow some variation /tolerance in flatness?
    Due to low production, and complexity of measurement the sample size will always be low.
    What are you trying to acheive or what do you think you will get by plotting control charts? Are you having a lot of issues with flatness? Do you more than 1 shift making these parts? Do you always have the same operators?
     

    0
    #139789

    AT
    Participant

    Actually, I want to see how many of them have defects. I am sure we don’t have many defects. May be very few 1 out od thousand but to prove this I need som proof. This study is only to show the record that we have very negilageble defects. Both shift are working on makeing these plates. Usually it takes about an hour to make one so, its a low volume production.
    Thanks
    Ramesh

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