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Viewing 7 posts - 1 through 7 (of 7 total)
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  • May 26, 2005 at 6:56 pm #39500

    GN
    ★ 10 Years ★
    Participant

    What is it more recommended for SPC study if the product has about 300 holes to be measured?
    Thanks

    0
    May 26, 2005 at 7:37 pm #120280

    Ken Feldman
    ★ 10 Years ★
    Participant

    I recommend that you immediately fill 250 of them to make it easier to measure and use SPC on the remaining.  I suggest that you use Silly Putty for the fill since that would be consistent with the nature of this question.

    0
    May 26, 2005 at 8:11 pm #120285

    lin
    ★ 10 Years ★
    Participant

    What are you trying to accomplish?

    0
    May 26, 2005 at 9:19 pm #120289

    Issa
    ★ 10 Years ★
    Participant

    He is trying to tell you that your question is too vague to generate an  intelligent answer.

    0
    May 26, 2005 at 9:30 pm #120290

    lin
    ★ 10 Years ★
    Participant

    I was answering gn, not Darth.  Simply posted in wrong spot. 

    0
    May 26, 2005 at 11:43 pm #120297

    GN
    ★ 10 Years ★
    Participant

    Sorry, my question is : Can I measure only one hole if these have the same specification or they need to be measured separately in a SPC chart?
    Thanks

    0
    May 26, 2005 at 11:59 pm #120298

    Issa
    ★ 10 Years ★
    Participant

    One way of doing it would be to take samples of the products at given time intervals and tests them, and plot the results on a control chart. Since in the case of your product, the number of defects follows a Poisson distribution, it would be better to use a C-chart. If there is a way to test all the wholes at the same time using a single tool, that would be better, if not, I would suggest that you sample a number of holes on every part (not the same holes every time) and test them.

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