Doug Coenson


  • Feel free to calculate per product but you can calculate per shift just fine. 2 months ago

  • If you have zero defects, then you wouldn’t need it. It would be hard to imagine zero defects over a long period of time if you show a lack of control for the short amount of time captured in your chart.

    If you had a Cpk and Ppk of 2+, then go elsewhere first.

    Please be aware that specification limits aren’t used for control chart[Read more]

  • the takt time is different for each process. reference the formula you have in mind. 3 months, 3 weeks ago

  • I can’t imagine doing SPC on amount in and amount out if you are looking at quality as your pain point. Knowing nothing else of your process, why not look at quality % with a run chart. If you’re going to do SPC, I bet you’d have too many things to investigate if quality goes out of control. 6 months ago

  • Are you sure you did the comparison correctly? Did you wait until the mean and/or standard deviation looked at a stable process reading before comparing the means or sd? 7 months, 3 weeks ago

  • @michaelcyger great response….. though I’m way behind on the praise! 1 year ago

  • If you can use excel faster…do that and then copy into their Minitab worksheet.

    1 year ago

  • @rbutler brings up excellent points.

    See if you can quickly change your measurement system to a variable/continuous data system and confirm it’s performing with an MSA. You’ll solve your problem well and faster and learn more about the process if you are able. 1 year, 1 month ago

  • Are you doing an MSA for the variation or the mean of the material you tested? 1 year, 3 months ago

  • I would do it.  If they have something like a green belt–you’ll learn more. 1 year, 5 months ago

  • observation is a fantastic tool. 1 year, 5 months ago

  • Thanks @chebetz

    Interesting article.  It’s kind of “wonky” but they seem to be making a mountain out of a mole hill if I have the expression correctly.  Basically, just because one picks the “correct” side of the stat test with the appropriate p-value, there is uncertainty which is why things should always be proven “in the field” or else one w…[Read more]

  • Sure you could.

    Just look at your data–if it’s reported/recorded to the nearest 5 or 10 or 100…then you won’t have the precision potentially to use as continuous.

    Don’t forget to do an MSA! 1 year, 8 months ago

  • Check this website. or google…but lots of advice out there.

    Basically, find a project with measurable results, a manageable size, identify team members with a project champion and find an impactful goal and start there. 1 year, 8 months ago

  • Look at the total ppm defective.  Translate between Cpk and sigma level…for that one side of the curve. 1 year, 8 months ago

  • Please use data for your FMEA ratings.

    Also, many pieces of equipment have recommended calibration frequencies that would be HARD to ignore.  However, have you considered use of SPC for monitoring the measurement systems.  This is a great tool to signal when calibrations are needed. 1 year, 8 months ago

  • Try working with a social organization you already are a participant.  I’m sure every organization could use some volunteer talents. 1 year, 8 months ago

  • It seems you do have a UCL. :)

    hope all is well with you @rbutler ! 1 year, 8 months ago

  • Consider looking up Z normal tables versus sigma and check out tables that don’t “shift” and then consider you will have SOME defect rate at both ends of the curve and add. 1 year, 9 months ago

  • I’d highly recommend the beer exercise and other VERY basic lean concepts/training before having them do an exercise.  Also, do you have a champion for such production layout you are proposing? 1 year, 9 months ago

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