THURSDAY, SEPTEMBER 21, 2017
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  • well if the parts come from the supplier, you can always tell them what you’re doing and wonder if they have any poorer quality parts from startup or incomplete processing etc.

    get what you can….see how the gage does for the process variation and see if you see any semblance of MSA degradation for those closer to the mid range of your spec.…[Read more]

  • If it is strictly a 2 level factorial design then of course you can’t check for curvature. A straight line is defined by 2 points whereas a curved line requires a minimum of 3. A strictly 2 level factorial has only a min and a max setting for each of the variables – 2 points so, only a straight line and interactions expressed as non-parallel…[Read more]

  • First off – they are used for more than just a check for the existence of some kinds of curvature. If you have your design and have not included replicates then running a center point with a single replicate not only buys a check for possible curvature it also gives you an economical measure of pure error (we are, of course, assuming variables…[Read more]

  • Darth started the topic Upcoming LSS Conference in the forum General 1 day, 23 hours ago

    Just found out that Capt. Sully Sullenberger will be the Keynote Speaker at the Lean Six Sigma World Conference April 3-4, 2018 in Las Vegas, NV USA! Captain Sullenberger is known as an international hero for “Miracle on the Hudson,” for safely guiding a US Airways jetliner to an emergency landing on the icy Hudson River. He is also a No. 1 New…[Read more]

  • Jignesh – The more details you provide, the more likely you are to get a response. What do YOU think you should do? Why or why not? The iSixSigma audience is helpful, but they like to see that someone is putting forth a good-faith effort; they are not here to do your work for you.

  • Chris Seider replied to the topic Data Accuracy not so Accurate in the forum General 1 week ago

    It would seem to be easy to count the # of errors if it’s already known to be 10-15 per month. That’s the ultimate accuracy–assuming the system to catch the errors is correct.

  • No shifting (as in 1.5) is done in Minitab’s outputs.

    It’s using estimation of overall s.d. versus within s.d. (standard deviation).

    It’s late in the day but there will be tails reaching further out than an individual point for long term (expected overall) so that’s why you observe “observed ppm defective” always less than expected overall.

  • Ask the question 1. What variation are you trying to understand? It seems he’s worried about too much subgroup variation–so why not do a Rbar chart. 2. If the max really is important, would a poke a yoke be better if doable?

    If they know what action plan would exist if the max goes out of control for the Xbar chart, then I’d say try it.…[Read more]

  • Chris Seider replied to the topic Cp and Cpk in the forum Tools & Templates 1 week, 2 days ago

    And so I’m clear…it would be rare they are the same. If you look at the formulas, you can see one can NEVER be larger than the other.

  • Surveys if using scales of 1 – X for replies should NOT allow for a middle number. Force the responses to one side or the other with an even number of choices if it’s a ranking scale.

  • Chris Seider replied to the topic Cp and Cpk in the forum Tools & Templates 1 week, 2 days ago

    You can see if you look at the formulas what condition could cause it.

  • As posed, your question has no answer other than to say that the minimum sample size could be 1 and the maximum sample size could be 1534. To provide anything meaningful to you it will be necessary for you to give us a detailed description of what it is that you are trying to do.

  • Kofi – The more details you provide, the more likely you are to get a response. What do YOU think you should do? Why or why not? The iSixSigma audience is helpful, but they like to see that someone is putting forth a good-faith effort; they are not here to do your homework for you.

  • @kevinyee I’m assuming you’ve done a process capability in the past?

    @mike-carnell Great way to force process variation quickly if that was your hint.

  • @dog2u It has been quite a while since I have actually used the QCI material but a friend of mine just purchased the BB manual. I used QCI to study for the CQE years ago and it was very helpful.

    The challenge to the test isn’t the BOK. The challenge is understanding what the question is asking. The manuals were very good at imitating the…[Read more]

  • @kevinyee This is just my thought based on what I am picturing your setup as. It sounds like aautomated/semi-automated test. You need to consider randomizing between runs.

    Just my opinion.

  • Before you start looking for a statistical tool you are going to need to provide yourself with some operational definitions – specifically – what is your definition of “good enough” and what is your definition of “mass production”?

    For example, if you have some kind of baseline metric/requirement, with respect to what is currently acceptable…[Read more]

  • If you’re doing only 2 “operators”, it’s highly recommended to get 3 measurements of each part so you have a good estimation of the s.d. of the gage measurement system. One caveat–people think that machines have no interaction with people placing the parts into the system and that can be a mistake–sample prep can be a big deal. Just an…[Read more]

  • Katie Barry replied to the topic New Member in the forum Welcome 3 weeks ago

    @PaulineSinclair Welcome to the iSixSigma community!

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