Karim Mohsen

@machireddy It’s nice of you to offer your help! We get lots of questions on all sorts of topics and I’m sure there will be a question on process safety that will be up your alley if you keep an eye on the forum.

@yousif.hamzah Welcome to iSixSigma! We’ve been publishing for almost 20 years so there’s lots of information on the site as you’re looking around.

@asqcqe@juno.com  Did you really state you’d tell the customer you wouldn’t help them out and give them a stupid phrase of “but my process is in control”.    Have you considered that something downstream of your process is impacting the product OR that variation appeared outside of your typical subgrouping that you’ve designed your control ch…[Read more]

I’d suggest you get to the root of why the subgroup size of sampling might change.  It sounds like they know of variation and rework may be occurring.

a few thoughts..

oh my….what a silly exam question.

Please know that there are a lot more analysis tools available and for them to mention “weaker” ones like Fishbone and 5-why (which are actually VERY related) is a shame.

Did you have enough gap between your levels for A and B?  This (too small of change in X’s) can cause small enough difference in your Y such that you can’t get statistical confidence.

@blazn007 That may be, but you didn’t answer my questions.

If you have done the research then you must have come up with an answer. What is that answer?

And if you know you’re wrong, then what are you being told is the right answer?

Do you have any guesses as to where/why you’re going wrong? If not, why are you sure you’re right? It’s not…[Read more]

@blazn007 What do you think the answer is? Why or why not?

The iSixSigma audience is helpful but they like to see that someone is putting in a good-faith effort on their own first.

a remote area…. was this necessary on the pareto of areas to tackle?

IF it’s used sometimes…as hinted by your post–consider the economics and effort for removal and reinstalling.

Have you checked this website?

You’ll be using a different set of skill sets.

Go for it!  Do your passion.

I hope you mean Cpk>1.33  :)

A pass fail test and using a sample of 8.  Just say no and convert the attribute test to a variable value test.

Why not use SPC as designed and not do SPC on a Cpk value on 8 parts (the imprecision of the s.d. enough is to make this kind of ridiculous in my mind).  Just do SPC as designed and work to raise th…[Read more]

See if you can get some “credible” projections on energy savings from the high speed door closer vendor rep and then use a subset of @venerablebede ‘s analysis.

This may save some work but of course @venerablebede full technique will work.

@Mike-Carnell  So close! @venerablebede is what you were going for.

Interesting query.

Have you put together a mathematical model to help answer your questions and @mike-carnell has given you a hint to an approach.

keep in mind you’re making lots of assumptions…would you be using an Xbar chart–if so I’d doubt your CL’s would be as you’ve concluded.

Just ask yourself why are you wanting to do this?

I would caution you against putting spec limits on SPC charts BECAUSE if you’re using SPC as an active tool to control the process (or why else put them in the “field”), then you have to be wary that the nuance of an XBAR vs I chart will be lost by most “operators”.

Once they learn one way, they…[Read more]

I’d be too conservative to put a control chart out with out of control actions based on 2 or 3 subgroups.

Remember, the estimation of standard deviation improves with the number of observations so the estimated s.d. even using Rbar.

If you are using just a few points for “analysis”, go ahead although I doubt you’ll learn much.  I just never…[Read more]

You’re much closer to the process than me BUT if there’s no integrity issue with the shrink wrapped pallets, then consider how to get rid of the stops by moving the relative positions of the eyes as a PARTIAL solution.

@JanineSarti There are two places on iSixSigma that you might look at for inspiration.

1. This article that lists project selection ideas: https://www.isixsigma.com/implementation/project-selection-tracking/project-selection-options/

2. Our Industries > Healthcare section of content: https://www.isixsigma.com/industries/healthcare/

you hold parts to a Cp/Cpk standard?  Not specs?…..I find this confusing

I apologize if I’m having a brain freeze.